Camshaft Lobe Scoring

This worries me the cam and engine are n. Through the years, Ford has tried in vain to silence much of the Modular engine's noise, experimenting with nylon-coated cam sprockets. Lobe lift intake. It HAD a P0016 as well but after the repairs that codes has gone away and not come back. Later engines with the roller cam did use a thrust plate. Works fine with new motors designed with roller lifters or followers, but increases wear on flat tappet and bucket cam engines. He measured the cam. Camshaft theory is like skinning a cat, many many cams will work and at a certain point you will split hairs and it will get more and more application specific. Place the camshafts on the cylinder head. CAM LOBE HEEL ADJUSTING SHIM CAM FOLLOWER 9. -Fit the oil pump cover, by tightening the two screws to the prescribed torque. and the hollow bore was bunged up with gasket goo. The bearings should turn smoothly and quietly. For sometime now I have taken note of members of other forums are having problems with cam lobe's being lost because of the lack of zinc additives. Diagnose a worn cam lobe or lifter roller. Time for a teardown and a regrind on the camshaft, possibly a replacement. Insufficient spring pressure causes the lifters to bounce over the cam lobe, which causes valve float. One thing that might workif the original camshaft looks good, and all the lobes are in good shape with no scoring marks, you can lightly polish the cam with fine emery paper and reinstall it with NEW lifters. With the cam out of the block, eyeball down the cam on each lobe, and paint a white line on the face of the gear where the center of each lobe is. However, for a cam placement to be secure you need to be competent in finding the right place to put the cam, choosing the right size. Tanned in the judgement from afar. 15mm on the high. This is a LS2 GM chain, and the cam gear is a 2005-2008 C6 corvette piece that accepts the 3 bolt cam fasteners, yet still has the proper cam sensor pickup points for the Gen IV motors. Our Custom cam designs have powered winners in almost every form of racing you can think of. The pushrod ball ends at the rocker arms and the mating ball cup in the rocker arms are often scuffed badly. He was a lifelong mechanic, ran his own shop for 50+ years, etc. • Custom order the cam requesting the cam grinder's best surface hardening treatment (nitriding) and best lobe polishing. Flat Camshaft: The camshaft is responsible for opening the intake and exhaust valves. It takes an English sentence and breaks it into words to determine if it is a phrase or a clause. Cost ~$300 US. 227/241 Duration at. Could it be a lack of lubrication or am i just being an alarmist. No choice than to continue stripping and reviewing when they spotted the camshaft case hardening had failed on cylinder 1 exhaust lobe as they turned the head over. A quality cam should have. Micrometer c. The camshaft lobes go through a carburizing process to harden them at manufacture. ) If the journal diameter is not as specified, check the oil clearance. 2 points · 18 days ago. Use only the manufacturer recommended lubricant, which is generally included with the cam. The lobes of the camshaft show no sign of scoring or any other damages. Created by. This can also lead to premature camshaft wear. Although the 1963 Z06 didn’t stand a chance over the 289 Cobras, the Grady Davis Gulf One was the most successful of all of the 1963 Corvette Z06s, scoring many podium finishes in 1963 A. You think it'll mess up my timing in any way?. CYLINDER HEAD/VALVES 9-9 MYROAD 700i INSPECTION Camshaft Holder Inspect the bearing surface of each camshaft holder for scoring, scratches, or evidence of insufficient lubrication. [a] Check the camshaft lobes and journals for scoring, pitting, or flat spots. Camshaft belt replaced. 3/8/2020 07:57:29 PM PONTIAC POWER RULES ! ! ! Do you like this site? A small donation would be appreciated. 107 Degree Lobe Separation Angle. "A reduction in engine power and/or increased need for braking effort after vacuum. I have had these cams on the car since April 02. In most cases, the two burnish marks will overlap and cause scoring. dic This class can parse, analyze words and interprets sentences. However, I had a camshaft failure with a comp cam in my 408. • If production head is designed for hydraulic cam, modification is usually required. Intake and Exhaust Valves. N55 intake camshaft bearings. Problems & Solutions beta; Log in; Upload Ask Vehicles & accessories; Motorcycles; Yamaha; SR125; Service manual. To do this, you need a procedure to measure camshaft lobe lift. The damaged gasket lowers the oil volume going to the camshaft. It picks up pressurised oil, through a bearing in the block, which flows the length of the cam exiting the lobes. As camshaft lobes wear, they begin to affect valve timing and operation. "A reduction in engine power and/or increased need for braking effort after vacuum. The camshaft is driven by an intermediate gear in the timing gear train which meshes with the crankshaft gear. ” But when he said “unless. Standard camshaft intake lobe height is 36. Sticking valves are often the cause of cam lobe damage, the article says. For people who have rebuilt their engines or done cam swaps, did you see the same type of wear? Is this considered normal cause I could only find instances of this happening on GT500 motors, 4. Need artist to create? Kenny stated he was before? Might somewhere lose and nobody would ever stop touring? Astronomers told to treat cancer. That is when I safely bubble wrapped and zipped tied my Clearwater lights to the radiators and had it towed to the dealer. Inspect the camshaft lobes and journals. • If production head is designed for hydraulic cam, modification is usually required. Acoustic Holography based on the Inverse-BEM for the Source Identification of Machinery Noise Jeong-Guon Ih. Camshaft runout. He suggested I use a plastigauge to test the clearance when I install them and if it's a bit too much, to take 600 grit wet sand paper on glass and take a bit off the cam caps. However one lobe on a cam for the exhaust valve of cylinder 6 shows some reasonably deep. The 139681 is a gen4/5 shelf cam that is a bit more aggressive in all dimensions then that cam, if I were to choose every number I would choose 632/632 lift. I read somewhere that MP had problems with their cams. scoring index 胶合指数. 6L Camshafts and Valvetrain: The most distinguishing feature of the 4. Over time, the form and efficiency of these parts have changed significantly, though their basic function has not. When a crank shifts out of true. Maybe Lindsey Racing knows. The camshaft in my engine is part number 307621 which is the stock-standard cam for the 2500 TC and S. A special non-metallic feeler gauge (brass) is required. Yellow Bullet Forums Since 2005 A forum community dedicated to drag racing drivers and enthusiasts. Where Science and Common Sense Come Together for Safety and Better Engine Performance A-1 Miller's Performance Enterprises - Parts & Services Online Catalog. As camshaft lobes wear, they begin to affect valve timing and operation. Camshaft Duration, Lift, and Overlap. Offset camshaft/sprocket dowels are permitted. 1 Cam Followers. That will give you two marks, roughly at 4 o'clock and 8 o'clock on the gear. The scoring on the end can be cleaned up with emery cloth as well as the cam lobes. Installing a Racing Camshaft. As long as cam lobes are perfect and there are no raised edges on the journals, should be ok. Thread starter rvm; Start date This is the angle between the intake and exhaust camshaft lobe peaks described in camshaft degrees. However, maybe you're not upgrading cams for more power. Hi, I have an '88 560SL that got a valve job 3 years/1,000 miles ago, give or take. This clearance should not exceed. Rotating the camshaft allows it to enter easily and reduces the possibility of damage to the cam lobes and bearings. Lubri-Tex oil additive, the best friction reducer we have ever used. Get price and service! Cards shoot. -Both solenoids (OEM) replaced a few months prior due to a P0010 -All parts OEM EXCEPT the chain which is the…. The large particles that pits produce are caught in the oil filter or settle at the bottom of the sump. Cost over $5000. Knowing the camshaft lift--lobe length--allows you to setup your engine for maximum performance. * Valve lifter faces all had scoring. I was doing some research and it seems to be a somewhat common practice to adjust valves on these engines to. Through the years, Ford has tried in vain to silence much of the Modular engine's noise, experimenting with nylon-coated cam sprockets. Giantfinishing 18,731 views. For people who have rebuilt their engines or done cam swaps, did you see the same type of wear? Is this considered normal cause I could only find instances of this happening on GT500 motors, 4. The camshaft experiences heavy loads on the cam lobes and journals, which need to be inspected and measured if the camshaft is being reused. 020 deck All steel motors Stock straight plug heads (Must have stock valve size) Stock Crankshaft, stock rods, 4 eye brow dish-top pistons Hydraulic camshaft GM 602 only E. Lobes on cams near middle of both camshafts show little wear, lobes nearer the ends show slight scoring. I- Camshaft and Follower Service. 18 450 SX-F. These profiles have faster ramp rates or lobe acceleration for quicker valve opening and closing. The bearing on the far end looked like it had been a little warm (scorched oil) so I removed the seal to allow oil to slosh through it into the cup. The farther the valve rises from its seat the more airflow can be provided, which is generally more beneficial. I removed the oil squirter tube and rinsed it thoroughly with a chemical solvent. This is a LS2 GM chain, and the cam gear is a 2005-2008 C6 corvette piece that accepts the 3 bolt cam fasteners, yet still has the proper cam sensor pickup points for the Gen IV motors. and correct or replace, as required. Our Custom cam designs have powered winners in almost every form of racing you can think of. a spongy feel is a leaking or bad lifter, not a pulled stud , broken spring or bent pushrod, however you may have wiped the cam lobe running with no lifter tension. The 262 works great for the emission era engines and the 264 works wonderfully in the '68-'71 engines. I think I'll change out the rocker like you said and see what happens. The valve covers have been removed and the engine is running. The engine camshaft is used to drive the fuel pump and to operate the exhaust valve mechanism. org, the online collaborative radiology resource. An interactive camshaft calculator where engine builders can see how valve overlap (and boost efficiency) is affected by a camshaft's physical design. Lifters, pushrods, rocker arms, and valvesprings take a. Wash the cylinder head in solvent. It is located in the housing for the roller guides. When the camshaft lobe raises the outside of the arm, the inside presses down on the valve stem, opening the valve. You can see where they made contact on the lobe leaving a 'dent' in the flat face of the toe. Generally speaking the majority of cams will fall between 98 and 120 degrees. wear as follows. 108 Polishing of steel parts in one step - Duration: 2:19. 050" checking clearance. In 1985, Ford introduced hydraulic roller tappet camshafts on the 302 (5. 524-intake/exhaust lift, 200/207-crank angle degrees intake/exhaust duration at 0. Just a guess here. Note: Some say that reducing scores with 800-1200 sandpaper and then polishing can improve the oil film. Yellow Bullet Forums Since 2005 A forum community dedicated to drag racing drivers and enthusiasts. 54" exhausts, which I want to do, because of the odd tulip shape of the Chevy exhausts. BESM020037. Clean gasket surfaces with 400/800/1200 grit paper on a sanding block Note: Start with 240 paper if there are deep dents. 0 N·m (80 in. It takes an English sentence and breaks it into words to determine if it is a phrase or a clause. It all begins with minor scoring of the cam. Scoring of the two end castings can be touched up easily but scoring of the main center pump casting requires specialist attention due to the recessed location. 009 smaller. 34 Stock Type Cam No score for this post November 16 2000, 12:51 AM Hi Troy! I have been running the Isky 262 Supercam and 264 Megacam in my 460 stock type engines. The cam lobes have to be done with 1500 or higher grit. 9 https://www. Diagnose a worn cam lobe or lifter roller. First let us define the lobe centerline angle. 009 smaller. This angle dictates two important events: the valve overlap around TDC, and intake or exhaust valve closure delay there is in the relevant stroke (inlet/exhaust). Created by. Inspect camshaft journals. This is done by the camshaft lobe, one for every valve. My finger nail grabs a bit as I slide across it so it's not a really deep but appears to have. Last Updated on Thu, 12 Sep 2019 | Toyota 4A F 4A GE Engine. In my humble opinion the cause of this is usually due to lack of frequent oil changes. com IMPORTANT: Read all safety precautions and instructions carefully before operating equipment. However, for a cam placement to be secure you need to be competent in finding the right place to put the cam, choosing the right size. "Blue" Drum The inside of the brake drum has a blue tint, and components can be damaged or deformed. Took it to a garage and the mechanic opened it and said the camshaft and other gaskets are fine just the tappets needed changing so he changed them. Engine oil by itself (regardless of quality or viscosity) is not enough! • Mechanical cams require lash adjustment. 2 Install the engine turning tool. And there low and behold the images of my camshaft clearly showed a prominent exhaust lobe protruding from the shaft in a place where on my example only showed signs of scoring. I'm told it doesn't look too bad! The camshaft still has it's chamfer, but there's some light scoring on some of the lobes and the tip looks like it's just starting to wear on some of them (not easy to see in the pictures). Both camshaft position sensors. Examining the lifter after the spendy repair showed me it was a galled pin due to bad material selection + inferior lubrication path design. At that point, you'll notice your performance decreases and you're not getting the mileage you did before. Sticking valves are often the cause of cam lobe damage, the article says. It had a mild cam and headers but he never felt that it ran as well as it should have. Happy foot. Valve springs and valve spring shims are unrestricted, except that: 1. Camshaft Failure Analysis: What Causes Excessive Camshaft Lobe Wear? We all know how important camshafts are to the function of your engine, and when they fail it can spell trouble. Two technicians are diagnosing a problem with an OHV V-8 with flat-bottom lifters. Camshaft Gear Assembly Series 60 Exhaust Gas Recirculation (EGR) Model Series 60 EGR uses a camshaft gear assembly. Turn the camshaft bearings with your finger. You can see where they made contact on the lobe leaving a 'dent' in the flat face of the toe. New-Style One-Piece Camshafts for Kohler engine models K141, K160/K161, K181 and Magnum M8. Posted on October 25, 2017 by bmwtechnician Oh no another intake camshaft bearing damaged,,,,this job all started with a check engine light on a N55 and faults eccentric motor ,,,after replacement we had more problems and new faults,,,we had intake camshaft and turbo boost issue,,,,the car ran just fine no limp. ) If the journal diameter is not as specified, check the oil clearance. It HAD a P0016 as well but after the repairs that codes has gone away and not come back. Welcome to the North American Subaru Impreza Owners Club Check out the photos, looks as if the cam lobe was held in a vice at some point. Timing plays an important role in scoring an engine. I'm SURE it happens, I've seen _broken_ cams, I've seen valves get stuck in the hole and grind the cam lobe to a circle, but I've never seen a BENT one. - Duration: 12:25. Designed to work great with a stock torque converter and no milling on the heads, offers stable idle, excellent low end torque, and smooth lobe design for quiet valve train operation and longevity. As the camshaft turns, a pushrod moves along the lobe in an elliptical pattern. In most cases, the two burnish marks will overlap and cause scoring. 5 lobes going flat is kinda strange, but not unheard of now days. ITEM: camshaft pair. scotopic vision 微光视觉. Engine Mechanical Components Inspect the camshaft journals and the lobes for wear or for scoring. The pushrod ball ends at the rocker arms and the mating ball cup in the rocker arms are often scuffed badly. Iveco Daily Euro 4 2006-2009 Manual en Instrukcja Napraw - Free ebook download as PDF File (. - A (SDVOSB) Service Disabled Veteran Owned Small Business. lobes for each valve. This irregular wear can result in eventual fracturing of the lifter roller and subsequent camshaft and engine failure. This version features Toyota's Dual VVT-i, variable valve timing on both the intake and exhaust cams. When mine went, my engine started to lobe and rock the truck like a cammed out dragster! Little known fact, Cummins came out with a update for the camshafts on the dohc 871, they made the lobes wider and also updated the rockers to make the rollers wider to help with oil distribution and counteract the horrible wear problems. the camshaft will drop down allowing the lobes to hit and damage the bearings. If either condition exists, take measures to correct it. For bearing replacement in the camshaft holder, see page 9-12. Wear in the lobethe toe of the cam actually got a depression worn in it from the mis ground lifters. Lobe Separation Angle (Lsa)A camshaft consists of intake and exhaust lobes, and a key consideration when designing a cam is the lobe separation angle, sometimes called the lobe displacement angle. Check description for more accurate listing of kit contents. Spring opens like this. Again, This condition did not exist before running. • If wear is beyond the limit, replace the camshaft. Lobe Separation. Was doing the valve gasket and noticed some discoloration on the rear lobes of the cam. resulting in the follower to break due to cam-lobe pressure. The P0017, however comes back and it runs terribly. Unresolved: Release in which this issue/RFE will be addressed. do not continue to try to turn it over with multiple attempts as this will cause extreme wear and scoring on your new cams. The pitting of the camshaft lobes is attributed, at least in some cases, to corrosion. I read somewhere that MP had problems with their cams. Integrated Publishing, Inc. As long as cam lobes are perfect and there are no raised edges on the journals, should be ok. The first is the cam springs that are recessed inside the cam lobes themselves, allowing for a very narrow head width that fits easier into shallow, tight placements and pin scars. 108 Polishing of steel parts in one step - Duration: 2:19. 66brm wrote: What he is getting at is that with some cam profiles the lifter is not sitting on the base circle at TDC or BDC, I can't describe the best way to do it but the way I've done mine is to turn the crank till the opposite valve is at its highest lift, then adjust the opposite valve, that way the lifter is on the lowest point. Also replace the plastic lifter guide for the lifter that had the damaged cam lobe and/or lifter roller (For 2010 Model Year, replace all of the plastic lifter guides). Flat Camshaft: The camshaft is responsible for opening the intake and exhaust valves. 011 when the engine is “hot”. Camshaft Gear Assembly Series 60 Exhaust Gas Recirculation (EGR) Model Series 60 EGR uses a camshaft gear assembly. Inspect the camshaft lobes for scoring, and signs of abnormal wear. txt) or read book online for free. The bad news is after the mechanic opened my engine he found that both of my camshaft had some scoring. One thing that I want to do before putting all that new metal ($) on my crankcase is to check the camshaft for lobe wear. So in this picture the cam pushed a foreign object into the block? Anything else that could have caused it? I see scoring on the lobe, you think this can be saved with Emory cloth or do you think it will wipe the lobe?? Although it's cast iron and should be arc welded, I've had great luck using MIG to do cast iron. Scoring (Grooving) Scoring (grooving) are depressions in the drum's circumference that are deeper than. Hey ppls, I've recently pulled the cams out to find there's a little scoring and some polishing on 2 of the cam caps. A special non-metallic feeler gauge (brass) is required. When I had a lobe go flat on my 440, (solid lifter) I caught it pretty quick, and it had only worn down about. Duration for the cam specs in at 256/260 degrees at. A Subaru's camshaft is about 10" long, too. Signs of lubricant failure show surface sliding damage such as scuffing, scoring, and metal transfer across the surfaces. Camshaft journal scoring - need advice 03-04-2018, 12:20 PM. Yellow Bullet Forums Since 2005 A forum community dedicated to drag racing drivers and enthusiasts. I played it safe and secured them though, as I definitely didn’t want to have to buy a new camshaft (or two) if they broke loose, hit the concrete, scraped up a lobe or two, and were ruined. This provides the advantages of OHC geometry, and gives the cylinder-head designers more latitude, since they don’t have to work around pushrod placement. One other owner I talked with a few months back had this same issue. One of our rental vehicles which is a 2011 Equinox 2. VOCABOLARIO NAUTICO ITALIANO - INGLESE. One end is raised and lowered by a rotating lobe of the camshaft (either directly or via a tappet (lifter) and pushrod) while the other end acts on the valve stem. The profile of the lobe controls the engine air valve opening to optimize fuel burning. This version features Toyota's Dual VVT-i, variable valve timing on both the intake and exhaust cams. Port Manteaux churns out silly new words when you feed it an idea or two. Also is the Webcam 86b compatible with Udo lifters? I know a dumb question. Camshafts Not Acceptable for Reuse. Technician B says that the lifter is worn and must be replaced. Must pull 18 inches of vacuum @ 1400 r. Camshaft holder Inspect the bearing surface of each camshaft holder for scoring, scratches, or evidence of insufficient lubrication. All cams had scoring and wear. Like single overhead cam and double overhead cam engines, the valves in a pushrod engine are located in the head, above the cylinder. consideration any time camshaft and tappet service is being evaluated. Is it possible to polish out scoring on a cam shaft lobe? While doing a valve adjustment, I noticed a little bit of scoring on a couple of lobes. Inspect camshaft journals. Changes in today`s oil products and "advancements" in. If reading exceeds specification, replace camshaft. It HAD a P0016 as well but after the repairs that codes has gone away and not come back. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm. Let me know your thoughts! Thx! _____. the of - in and ' ) ( to a is was on s for as by that it with from at he this be i an utc his not – are or talk which also has were but have # one rd new first page no you they had article t who ? all their there been made its people may after % other should two score her can would more if she about when time team american such th do discussion links only some up see united years into. The valve doesn't just open completely all at once, it gradually opens as it follows the cam lobe profile. You can see how I do that here: 23 BMW 1983 R100RS Remove Transmission 21 BMW 1983 R100RS Remove Clutch 11 BMW 1983…. https://www. The key is to go in eyes wide open, the 991. A quality cam should have. MG Midget and Sprite Technical 1275 Camshaft BBS discussion and passes it out through a hole in the lobe base. That part's all quite simple. One thing to worry about is using the shorter stock 1. Those should be resurfaced and re-'parkerized' or replaced with new. Last year my engine began to tick. Inspect the camshaft for straightness, scoring, and galling before taking camshaft lobe measurements. The minimum measurement for the intake lobe height is 1. Not only was the wear an issue but the lobe surface was rough all over. They have around 150k miles on them. Spent hours at a wrecking yard looking at 5. Camshaft profile and lobe centers shall be checked using the official procedure published by SCCA. Tanned in the judgement from afar. NOTE: Record the measured reading if the clear-ance is incorrect. 1972 450SL 4. Yellow Bullet Forums Since 2005 A forum community dedicated to drag racing drivers and enthusiasts. If you get a chance to put some calipers on the lobes it would be good. Said that out of all the shot cams he's seen over the years in the various incarnations of the Chevy V-8, it's usually the #5 exhaust lobe that goes south. After cleaning the cam and journal surfaces, inspect them for any signs of scoring, pitting, or other damage. If the oil is dirty, it can also cause valve sticking and cam lobe scoring. understanding journal bearings and is integral to bearing design and application. Which as it turned out was not too uncommon for SBC cams of that era. That's what I've just done. PS- the 291 cam ground to Adventurer specs is available. If there is any evidence then replace the worn parts. Yesterday i went to triumph to change my chain tensioner because it was rattling at 7000rpm. and the hollow bore was bunged up with gasket goo. 4L V8 three-valve engines can cause a number of running problems. Meanwhile, three-lobe cams, often referred to as TCUs, lose some security due to less surface area but can fit shallower placements and make use of otherwise difficult to protect cracks. Place the camshafts on the cylinder head. The Mopar electronic distributor has a reluctor gap. At 34,600 km, fall of '89, another tune-up was done, including oil change again with Bardahl. Camshaft Duration, Lift, and Overlap. It has noisy tappets so i bought set of 16 new ones. Also inspect the lifter bores for any obvious scoring/damage that could be a concern. Get price and service! Cards shoot. Running BC springs and retainers. 5B Inlet camshaft has lobe for camshaft position sensor renewing the engine oil and filter (see Chapter 1), using only good-quality engine oil of the recommended viscosity and specification, before going to the expense of renewing any of the tappets - refer also to the advice in Section 1 of this Chapter. Coat the cam lobes and bearings with the Isky Cam Lube Oil Conditioner supplied with the cam, and carefully revolve the cam while inserting it through the block, taking care not to score the cam bearings. ca/en/ip/Red-VS-Blue-Abstract-Art-on-canvas-PT3023/PRD1SLRUQCSQOC7 daily 0. Camshaft, camshaft drive gear and camshaft gear cover are the indivual parts part of this assembly. Cam lobe wear causes rough idle by reducing valve lift. However, I had a camshaft failure with a comp cam in my 408. 030 wide and. consideration any time camshaft and tappet service is being evaluated. Camshaft Failure Analysis: What Causes Excessive Camshaft Lobe Wear? We all know how important camshafts are to the function of your engine, and when they fail it can spell trouble. This angle dictates two important events: the valve overlap around TDC, and intake or exhaust valve closure delay there is in the relevant stroke (inlet/exhaust). Bimmerforums is the preferred online BMW Forum and community for BMW owners. Hey ppls, I've recently pulled the cams out to find there's a little scoring and some polishing on 2 of the cam caps. Gear-drives are generally less prone to breakage than belt drives, which are often found in overhead cam engines. You can see where they made contact on the lobe leaving a 'dent' in the flat face of the toe. After cleaning the cam and journal surfaces, inspect them for any signs of scoring, pitting, or other damage. You can see how I do that here: 23 BMW 1983 R100RS Remove Transmission 21 BMW 1983 R100RS Remove Clutch 11 BMW 1983…. The most significant change on these camshafts is lift and duration primarily on the intake side. Over time, the form and efficiency of these parts have changed significantly, though their basic function has not. (I'm drawing that conclusion based on the fact that such damage is said to be seen in engines which don't get a lot of use). The shape of the cam lobe is called the cam profile. ) If the cam lobe height is less than minimum, replace the camshaft. Camshaft After the camshaft has been cleaned and a visual inspection has been made, check each lobe for scoring, scuffing, fractured surface, pitting, and signs of abnormal wear. Not enough oil getting to the bottom right cams? level 1. Carefully inspect all surfaces of the camshaft for cracks, scoring, galling, cor-rosion, pitting or other damage; be particularly careful when inspecting bearing surfaces. The rocker pads all. The magazine staff at Old Cars Weekly has opened the shops of several prestigious restoration businesses to show how the professionals and experts bring cars back to show-ready condition. Note that the spring loaded tensioner is history - it's replaced with a more reliable LS2 style damper block. Camshaft 2. This is to ensure that they are not worn as well as the lifter bores for any scoring/damage that could be a concern. Was doing the valve gasket and noticed some discoloration on the rear lobes of the cam. Re: Main Causes of Camshaft Failure / Damage 02/07/2013 12:01 PM If it's an '83 through '85 V45 Honda 750 Interceptor, then it is due to excessive pressure in the contact area between the cam lobe and the valve follower. 1 Old lifters will quickly score the lobes of your new cam, leading to degraded performance and premature failure. 6L Camshafts and Valvetrain: The most distinguishing feature of the 4. How to Get 700-plus HP on Ford's 351C Engine - Hot In Cleveland JGM Performance Engineering and Trick Flow Specialties show you how to get 700-plus horsepower from Ford’s 351C. After break in with mineral oil (5hrs) I have been using Motorex Crosspower 4T.