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Re: Oil Light
Posted by David Prantl (more from David Prantl) on Wed, 17 Apr 2002 19:39:01
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>  A friend of mine has oil pressure problems on his -86 9kT.

>  The light will stay for 10 secs during cold start only in  freezing 
>temps.

Using the oil-pressure warning light (otherwise known as an *idiot* light) 
is not a very good way of diagnosing oil pressure problems, especially on a 
rather old car like an '86 9kT.

Two 9k cars in my family have had a failed pressure sensor within the last 
six months.  Both failures included a false-on signal, either consistently 
or randomly, with and without oil leakage.

I would recommend replacing this sensor.  It's made in England, and here in 
the USA it costs less than four dollars.

The next thing your friend should probably do is hook up a calibrated (or at 
least graduated) oil pressure gauge to the car, and monitor the pressure 
during very cold startup.

>  The pressure relief valve has been checked and was working  correctly.  
>The oil pump housing cover and gears as well as  pickup tube seal have been 
>changed.

Hmm.  To change the pickup tube seal (o-ring), the whole timing cover must 
be removed from the engine.  That's a rather large undertaking, usually only 
done to access and replace timing chain components.  Removing the oil pan is 
not a whole lot more work at that point.

During the service pressurized air was blown
throught the oil pickup tube. The problem still exists.

>  I suppose the oil pick-up screen should be checked next.   Is there a way 
>to check or clean this without removing  the oil pan?

This would be a logical step, and, no, the pan must be removed.

David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP as of 2/98
'89 900, 3A, 116kMi, restored and SOLD on 3/24/01
'86 9000T, 5M, 197kMi
'88 9000S, 5M, 142kMi
'90 9000S, 4A, 140kMi
'93 9000CSET, 5M, 74kMi  -- FOR SALE in the TSN Classifieds --
'97 9000CSET, 5M, 60kMi
'68 97 Sonett V4, 4M, 76kMi, #000467
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