C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Oil leak above the filter

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Old Mar 21, 2010 | 12:59 PM
  #1  
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Default Oil leak above the filter

Hey guys I'm trying to track down an oil leak I've had for a while now. Its on my white 1986 with steel heads.There is a wiring harness above the oil filter and there is fresh oil all over it. Any ideas where it could be coming from? I've recently replaced the valve cover gaskets, they were in bad shape. Its been about a month since that and its still leaking. Any ideas?

thanks in advance
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Old Mar 21, 2010 | 01:12 PM
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There are a few suspect areas that come to mind:

The oil pressure sender and/or switch that are screwed into the block - driver's side of the distributor

The China Wall at the rear of the block

The valve cover itself (the one on my early 86 was warped)

Probably some others too.

Jake
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Old Mar 22, 2010 | 08:58 AM
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That pretty much sums it up.
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Old Mar 22, 2010 | 09:09 AM
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I had a leak also along with low oil pressure[ 1986] just bought a new oil pressure sending [25.00$] fixed both problems. Good luck
Steve
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Old Mar 22, 2010 | 09:46 AM
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How hard is it to check/replace the sending unit? I'm pretty inexperienced as a mechanic. I dont mind trying things for the first time but anything that involves pulling the engine is definitely a no-go for me
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Old Mar 22, 2010 | 09:51 AM
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Does the L98 have the adapter plate between the filter and the block?

If so, check there.
Since the L98 is notorious for the china wall leaking, that is my vote.
I would also reseal the oil pressure switch, just do not break it like I did.
They are a little expensive.
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