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

Leaky L98

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Old Sep 25, 2003 | 09:07 AM
  #1  
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From: Schmuckville SA
Default Leaky L98

Hey all, I have an 85 that just loves to leak oil...
I have replaced everything replaceable related to
oil (pan gaskets/ seals/ the dummy pump to plate
gasket, timing cover gaskets and valve cover gaskets).
Thing is, it is in the same spot (passenger side front).
Everyone looks dry, but sure enough, after the ride
to work it'll be wet on the crossmember under the
compressor and will start to drip ( I hate that!)
Soooooo, what am I missing here? I'm ready to
call it quits and buy a FORD (OMG, no!).(' :cry ');
Any help would be appreciated, thanks...
I hate oil leaks!!!


[Modified by Unriced, 2:08 PM 9/25/2003]


[Modified by Unriced, 2:09 PM 9/25/2003]
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Old Sep 25, 2003 | 09:15 AM
  #2  
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Default Re: Leaky L98 (Unriced)

The intake manifold is a notorious leaker.
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Old Sep 25, 2003 | 09:36 AM
  #3  
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Default Re: Leaky L98 (Unriced)

Hmmm could be, but there is no smoke or appearance of wet oil higher than the water pump.
It appears to be somewhere near the front pass corner of oil pan area (thereabouts)
Would a head gasket leak oil? I can not reproduce thie problem when the car is on the lift.
Only on the highway.. maybe I should have someone get in and hold it at 2 grand while
I get under.... (' :banghead: ');
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Old Sep 25, 2003 | 09:40 AM
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Default Re: Leaky L98 (Unriced)

Is it compressor oil ?
Degrease the engine bay and motor.
After its dry start the motor.
Grab a chair and a six pack and watch and waite. :D
You could try one of those dyes that make your oil glow with the right glasses and lighting.
Welcome to the forum !! :seeya
:cheers:


[Modified by AGENT 86, 6:44 AM 9/25/2003]
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Old Sep 25, 2003 | 09:44 AM
  #5  
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Default Re: Leaky L98 (Unriced)

They have the oil dye kits for locating leaks. I have never used them but have had good raves from other forum users.
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Old Sep 25, 2003 | 09:52 AM
  #6  
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Default Re: Leaky L98 (Unriced)

Thanks for the welcome, the dye idea sounds worth trying.
Compressor oil, I dont think it is. Wouldnt I also lose refrigerant too?
This one's a good one...PITA.. Appreciate the help..

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Old Sep 25, 2003 | 02:25 PM
  #7  
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Default Re: Leaky L98 (Unriced)

there is a bolt hole on the front pass. side of the engine block than will leak, especially if the bolt fell out. this hole is used to pin the fuel pump pushrod (on mechanical pump engines) when the fuel pump is being replaced. use some thread sealer on this bolt and recheck for leaks.
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Old Sep 25, 2003 | 03:00 PM
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Default Re: Leaky L98 (87SAM)

The intake manifold is a notorious leaker.
:iagree: Another vote for the intake. Mine was leaking at the PS rear and I couldn't find it for weeks. Oil will travel in all manner of cracks and along mating surfaces. Your intake may be leaking and flowing down to the water pump and timing cover and on to the pan.
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Old Sep 25, 2003 | 03:18 PM
  #9  
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From: Schmuckville SA
Default Re: Leaky L98 (Unriced)

Is this just above the pump to plate assy? Or on the side?
I'd be interested to know where that bolt is.... Thanks..
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Old Sep 25, 2003 | 03:22 PM
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From: Schmuckville SA
Default Re: Leaky L98 (Unriced)

Other thing I noticed is on the bottom of the block pass side.

There is a hole on the edge of the block that goes up and has

a pilot hole with threads(perpendicular) that looks like it would

use a 3/8 bolt to hold someone else in place... Any ideas?

This can be seen with the car up on lift/ramps and w/o removing anything...

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Old Sep 25, 2003 | 03:47 PM
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Default Re: Leaky L98 (Unriced)

Is this just above the pump to plate assy? Or on the side?
I'd be interested to know where that bolt is.... Thanks..
This one gets my vote too.

The hole is on the passenger side front of the block roughly perpendicular to the location to where the mechanial fuel pump would bolt.
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Old Sep 25, 2003 | 06:28 PM
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Default Re: Leaky L98 (Unriced)

Just a quick FYI.
My vette had Quite a few leaks on it.
But then about 4000 miles ago I put in Valvoline MAX Life oil.
Now I have no leaks. My vette has 87k miles on it.
No spots on the garage floor.
Good Luck
tony

:flag
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Old Sep 26, 2003 | 01:39 PM
  #13  
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Default Re: Leaky L98 (Steel Blue 91)

The intake manifold is a notorious leaker.

:iagree: Another vote for the intake. Mine was leaking at the PS rear and I couldn't find it for weeks. Oil will travel in all manner of cracks and along mating surfaces. Your intake may be leaking and flowing down to the water pump and timing cover and on to the pan.
Another manifold suspect here. :iagree:
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Old Sep 29, 2003 | 08:31 AM
  #14  
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From: Schmuckville SA
Default and the winner is..... Leaky L98

The culprit was the missing bolt in the front of the block.
There are two holes, and it is the upper one was missing.
Thanks forum, I shoulda asked before I did all the other
work... :hurray:
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