Quote:
Originally Posted by andrewwynn
Unless: the problem is the opposite. We are all thinking there is slop. Maybe a lifter is too tall and causing a tiny "knock" that sounds like a tap because of the relative size.
Since my m54 taps when the oil is cold =thick I'm assuming it's lifters that aren't quite full but it could be dry cam lobes before they get sprayed by the overhead oil channels.
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My guess at this point is the old lifters (one or many) are not fully expanding (or not recovering) after compression. There is no new lifter in there yet. Some are the originals and some are picked up from another X5 and rebuilt. By rebuilding I mean, just disassemble and do a good clean up. I did not change any parts in them. What I saw again when I disassembled some today was their small piston springs were shortened a little by use which may explain them not recovering quick or expanding enough and causing the tick. When I compress them by hand, I can definitely tell the new one has more strength..
I am going to check all the lifters tomorrow but I am leaning towards replacing all the lifters (can find them (INAs) for $15 - 20 each) and air pressuring the oil passages for final clean up..
Thanks,
Ozzie