Hi all,

After some testing, I think I have a clogged oil check valve in the head of my 2002 M54B25. The motor was a replacement that sat a while before I purchased it. I’m experiencing a low oil pressure light and low oil level light upon cold starts. Sometimes 10 seconds or more. It’s accompanied by lifter tick that goes away when pressure returns. I’ve removed the filter housing cleaned the valve and verified it works.

I think the other check valve is on the bottom side of the head. I don’t want to remove the head. Is there any way to attempt to clean it?

Thanx
Chris


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