Camshaft install tips and tricks
(→Engine RPM for break in) |
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{{!}}Use this list as a guideline so that you remember to check all these things when installing a new flat tappet camshaft. This list is not gospel, and if the manufacturer of the camshaft you're using recommends procedures that differ from what is shown here, use the manufacturer's recommendations instead. | {{!}}Use this list as a guideline so that you remember to check all these things when installing a new flat tappet camshaft. This list is not gospel, and if the manufacturer of the camshaft you're using recommends procedures that differ from what is shown here, use the manufacturer's recommendations instead. | ||
| − | ==Mistakes that may | + | ==Mistakes that may cause failure of a flat-tappet camshaft and lifters == |
===Cleaning=== | ===Cleaning=== | ||
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===Engine RPM for break in=== | ===Engine RPM for break in=== | ||
| − | '''13. Failure to run the motor at 2500 rpm or higher (alternating 500/1000 rpm up and down) to allow the crank and rod big ends to throw oil onto the cam, for a minimum of | + | '''13. Failure to run the motor at 2500 rpm or higher (alternating 500/1000 rpm up and down) to allow the crank and rod big ends to throw oil onto the cam, for a minimum of 20 minutes.''' |
| − | {{Warning}} No idling! The motor should not be run at less than 2500 rpm for a minimum of | + | {{Warning}} No idling! The motor should not be run at less than 2500 rpm for a minimum of 20 minutes. If a problem develops, shut the motor down and fix it, then resume break-in. The main sources of camshaft lubrication is oil thrown off of the rods and crankshaft, drain back from the oil rings and oil blowing around inside the crankcase (this is known as "windage"). At idle, the crank isn't spinning fast enough to provide sufficient oil splash to the camshaft/lifters for proper break in protection. |
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'''19. Failure to observe the lifters and pushrods turning with the motor running.''' | '''19. Failure to observe the lifters and pushrods turning with the motor running.''' | ||
| − | If the lifter is not turning, the cam lobe is hitting on the same spot on the lifter every revolution and it won't be long until the lifter yields and then takes the lobe out with it. All lifters and all pushrods must be turning for successful engine operation. | + | If the lifter is not turning, the cam lobe is hitting on the same spot on the lifter every revolution and it won't be long until the lifter yields and then takes the lobe out with it. All lifters and all pushrods must be turning for successful engine operation. |
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==Lubrication== | ==Lubrication== | ||
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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. | 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; | + | 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. |
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