M54 head gasket project

[andrewwynn]

I am always have my bandsaw with


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[ahlem]

More updates...
Are the cams on a 2005 X3 the same as a 2001 X5?
What might cause pitting on a lifter like this?

[andrewwynn]

Contaminated oil? Oil becomes electrolytic and galvanic corrosion?

[jopecasa]

Re-using leftover over oil from last maintance....I think.

I never keep and/or re-use excess oil.....contamination occurs once seal/cap is opened.

Purchase oil or other consumables when required.....only.

[ahlem]

This lifter was in the cam set I pulled from a lower mileage X3. Hopefully someone can verify the cams will interchange and I can interchange a couple lifters from the 2001. This is the worst one of maybe 5. The lifter bores look good.

[Effduration]

According to FCPEuro , the same lifter was used in Both the X3 and X5. You could also confirm with RealOEM, but I think they are fine to interchange.

[ahlem]

Does anyone know what the allowable lateral movement of the valves is?
I'm discussing valve guides. The machinist gave me dimensions and said they were still within the acceptable range. I'd like to know what the zero miles figure is if someone know that as well. Now would be the time to do this if it's ever going to be done.
I wrote down the numbers but left them at work and noted one side was a fuzz more than the other. I can't recall off the top of my head if the exhaust is typically what wears more but it would seem to make sense due to the heat.

[ahlem]

Another update.
The “Whack a mole” valve removal tool worked very well for removing the valves.
Not for reinstalling them. I made this in about an hour on a Sunday afternoon. Didn’t cost anything and works well.

[ahlem]

I’m evaluating swapping a couple lifters from the old cams to the newer ones.
Dimensionally they measure the same within a tight tolerance. The oil port on the old lifter is angled. Is this going to be an issue? Is there a difference in the dimension affected by the hydraulic plunger contacting the valve stem? I would think not since it’s hydraulic?

[ahlem]

Lifter update...
I opted to buy a couple new lifters rather than mess around with mixing and matching. According to Realoem.com , the straight bleeder hole is the current version.