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post #1 of 2 Old 10-28-2013, 05:01 AM Thread Starter Fanatic
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2008 6.4 when cold start there is small knocking noise but after driving and engine is warm the sound goes away. Motor is stock and change oil ever 7500 miles. Only 37000 miles on vehicle. Any ideas?
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post #2 of 2 Old 10-28-2013, 05:45 AM
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what oil do you use? what is the ambient temperature most often?

possibly, it is a lifter.. lifters can bleed down and take a bit to recharge.. it's not precisely harmful, but it isn't good for the lifter's internal spring to bear the full weight of actuating the valve train..

viscosity of oil makes a big difference... it depends on which school of thought you subscribe to- thinner oil charges faster but leaks down fast too.. thicker oil charges slower but is less likely to bleed out..

those things are like the tiny trash cans of the valley.. they will suck up all the tiny debris- and some of those debris can possibly lodge inside them, which make them charge slower as individuals, and you'll get clatter.. a collapsed lifter can make a horrendous noise, TIC TIC TIC- much louder than you would ever think it could.

of course, that is just one thing it may be.. another is a belt tensioner..
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