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1990 928 S4 oil check valve question

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Old 03-19-2016, 04:38 PM
  #31  
Mrmerlin
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maybe the PO that added the JB weld to the setscrew also scr4ewed with the spring
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Old 03-19-2016, 08:54 PM
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There's parts of the spring still in there somewhere.
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Old 03-19-2016, 11:56 PM
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Originally Posted by docmirror
At your own peril, you can do what I did. Use a dollop of grease/vaseline on a long q-tip. Stuff it down in the gallery, past the ball seat. Insure it seals the gallery below the seat. Use an HVLP spray gun SS or brass cleaning brush on a drill to burnish the seat. Don't go hog wild here. Connect a vacuum to a 1/4" metal line, and suck the goo out from below the seat. Keep sucking until all the goo is removed. That's about as clean as you can get without opening the oil pressure system and blowing out the galleries.
Opening the pressure system and blowing out the galleries presents its own particular problems, like making darn sure the plugs are in and in good. Once the engine is in, running and all and that back driver's side one by the brake booster leaks you will be pissed off. I know. Then it's 4 hours to pull the engine cause you don't want to pull the head. It take 5 min to put the new one in and 4 hours to put the engine back in. That sucks.
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Old 03-20-2016, 04:03 PM
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Originally Posted by docmirror
There's parts of the spring still in there somewhere.
My thoughts exactly.
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Old 03-20-2016, 06:06 PM
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So could this crap spring be related to my low ish oil pressure and rattling engine ??
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Old 03-20-2016, 10:57 PM
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Oye - low oil pressure and rattling engine are not - a - good - thing.

I would say this issue is contributory, but there's likely something else going on. Maybe both check valves being hosed would do it. That gallery serves to cams and the lifters so without enough oil pressure in the upper deck area, you'll get some lifter rattle. Are you going to refurb both check valves? I would highly recommend it.
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Old 03-20-2016, 11:23 PM
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What do the cam noses look like? Lifter face damage?
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Old 03-21-2016, 08:08 AM
  #38  
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Originally Posted by docmirror
What do the cam noses look like? Lifter face damage?
Everthing else looks fine to me no damage but the spring sure looked off !
Got that side back together will try to check other valve
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Old 03-21-2016, 11:01 AM
  #39  
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did you see if the ball seat is loose?
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Old 03-21-2016, 11:06 AM
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Originally Posted by Mrmerlin
did you see if the ball seat is loose?
Ball seat solid no issues
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Old 03-21-2016, 11:39 AM
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When I put mine back in, I used a bolt and ground a point on it. I didn't want to have to fight the allen again. Run a die onto the threads of a small bolt, grind the point, the run the die back off to clean the threads. Make sure the o-ring is new, insert the plug all the way in and then screw the bolt in with some red loc-tite.

Let us know how the oil pressure reads and any clacking after the job on both sides.
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