Thread: 525i Head
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Old 02-18-2011, 09:07 PM
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ricks5series ricks5series is offline
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Location: So. Ca
 
Join Date: Dec 2008
Posts: 485
Mein Auto: 525i, Corvette, 530i
It's on to reconditioning the hydraulic lifters. I'll post a detailed write up at a later date so this is just a quick summary.
Photo a: Blowing the crud (coolant/oil) out of the inner chamber.

Photo b: After slamming the inner piston out (I know, sounds extreme but it's really not) it pops out in one piece, at least most of them do, lol.

Photo c: Using a "very" soft brass dremel brush and "lightly" removing hardened oil deposits. This is after I "carefully" separated the pistons and cleaned the inside being careful not to lose or damage the small inner spring.

Photp d: Piston and lifter chamber prior to joining them together

Photo e: Took a 1/4" socket and gently tapped the piston assembly into place.

Did 3/4 of the lifters tonight and will complete all of them tomorrow.

This procedure is an absolute MUST if you have a coolant in the oil situation. Word of caution, lifters should not have any oil in them when reinstalling. Oil pressure will take of filling them a few seconds after startup.
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