04-19-2017 09:09 AM #16
Roller cams are not immune either though.
While the move has been made by the OEMs to stop using flat tappet cams and lifters in production vehicle engines (replaced by hydraulic roller cams and lifters), they are not immune to failure.
The same type of oil additives should be used, because it is not just the cam and lifters that require a high pressure lubricant additive; use the heavy moly cam break in lube on a roller cam or lifter- it will cure problems. If those are not available for some unknown reason (all should be found online), use motor oil or a roller lifter-specific lube for the roller lifters and cam.
1 Bad roller cam lobe caused by insufficient lubrication and/or valve train failure, possibly due to clearance problems
2 Heavily chipped/pitted/galled lifter roller
And, example of hydraulic lifter failure.
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Very good pictures showing what we've been talking about for 20+ years now with more concern about free shipping of replacement crate engines instead of basic mechanic stuff---------