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Discussion Starter · #1 ·
Hi All,

Had my car for a headgasket job at the local specialist. He now claims that due to low oil pressure (which was happening) one of the balance shaft bearings spun and the engine thus needs a rebuild (due to the shaft tunnel needing to be rebored).

Does this sound right, or do these bearings not normally get damaged? Funnily, the main and rod bearings are OK.
 

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I have never heard of damaged balance shaft bearings.
That doesn't mean it didn't happen on your car.
I never recommend just disconnecting the shafts, but many people do it. I'd try it before I paid for a new/different motor.
 

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More of wear than anything

Sent from my DROIDX using AutoGuide.Com Free App
 

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Get rid of them and do the blanking procedure , assuming the engine is out anyway and tell us in a few months what its like without them.
 

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I tear down a good number of failed saab engines. From what I've noticed: balance shaft related oil pressure problems almost always go together with a torn up #3 main bearing (oil fed from there to balance shafts, tolerences too great at shafts drops pressure at the bearing and it gets chewed up)

I've seen more "fails" in the chain components than the actual shafts/bearings. Specifically the top idler on the balance shaft chain (oil fed)

For clarification, is this car now showing low pressure AFTER the head gasket? I'd send you in a completely different direction if that's the case
 

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Discussion Starter · #6 ·
I tear down a good number of failed saab engines. From what I've noticed: balance shaft related oil pressure problems almost always go together with a torn up #3 main bearing (oil fed from there to balance shafts, tolerences too great at shafts drops pressure at the bearing and it gets chewed up)

I've seen more "fails" in the chain components than the actual shafts/bearings. Specifically the top idler on the balance shaft chain (oil fed)

For clarification, is this car now showing low pressure AFTER the head gasket? I'd send you in a completely different direction if that's the case
Yes it was after the gasket was fitted. What are you thinking of?
 

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Relief valve in the timing cover. Debris gets dislodged during the head gasket job and will hang up the valve. Do you get a constant oil light or does it flicker after the car is warmed up? Did you have low pressure before the HG job?
 

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The relief valve is located on the timing cover just next to the oil filter?

Anything done to service it besides take it apart while the cover is off and clean it out?
 
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