Oil Leak Ideas. Help!! - ZR-1 Net Registry Forums

TX '90 ZR1 · 12-01-2017

The '90 I got just a few weeks ago has a small oil leak. I knew it was there, but had no idea I would have so much trouble finding for sure where it is coming from. Doesn't leak hardly enough to worry about. About 2 drops hit the floor after driving it a lot or a little. Can start the car and just move it in the shop and you get the 2 drops.
Drips from the passenger rear side of the oil pan. Seems to be coming from the rear of engine up high. Have checked all the normal stuff. Oil lines, senders, pan bolts, etc.
I can see a little fresh oil between the middle intake runners on the drivers side, but none towards the front or rear. Nor the passenger side.
Think it may be something under the plenum?
If it is, why do I get the same 2 drops no matter how long I run it?
I am open to suggestions.
Thanks Guys !!

garyhugo · 12-01-2017

Oil pressure switch is my first guess.It's under the oil filter and hard to see. The switch itself will leak just a little where you are speaking of.Not to be confused with the oil pressure sensor.The switch is what lights the oil warning light, the sensor works the gauge.
Hope this helps.

Ccmano · 12-02-2017

The attached article will walk you through the usual oil leak suspects. Sounds like you may have a breather box leak under the plenum, however judging from your description it may be the stud for the passenger side exhaust manifold. Oil has a funny way of coming out at places that don’t necessarily correspond to where the leak actually is.
Good luck,
H

http://www.zr1specialist.com/HAT%20W...0the%20LT5.pdf

TX '90 ZR1 · 12-02-2017

Thanks garyhugo & Ccmano !!
I checked the oil pressure switch under the filter. Not there.
From reading the article by Marc I am inclined to think I may have 2 leaks. I am going to check the bolts on the oil pressure regulator cover and the PVC grommet. They are in close proximity to where the oil might be coming from.
By the way, this forum is GREAT. Always get informative, knowledgable responses.
I REALLY APPRECIATE IT !!
Maybe I can return the favors sometime.
Thanks again.

tiegsd · 12-03-2017

Quote:

Originally Posted by Ccmano

The attached article will walk you through the usual oil leak suspects. Sounds like you may have a breather box leak under the plenum, however judging from your description it may be the stud for the passenger side exhaust manifold. Oil has a funny way of coming out at places that don’t necessarily correspond to where the leak actually is.
Good luck,
H

http://www.zr1specialist.com/HAT%20W...0the%20LT5.pdf

Have a few small oil seeps myself I need to go hunting for. Thanks for the tips!

Jitse · 12-03-2017

Searching for leakages, personally I start with (proper) cleaning the engine. Searching for leakages is much easier then, it helps when you use a mirror and a torch, an videoscope can be handy too. And start it up...

12-01-2017	#1
TX '90 ZR1 Join Date: Oct 2017 Location: TX Posts: 2,038	Oil Leak Ideas. Help!! The '90 I got just a few weeks ago has a small oil leak. I knew it was there, but had no idea I would have so much trouble finding for sure where it is coming from. Doesn't leak hardly enough to worry about. About 2 drops hit the floor after driving it a lot or a little. Can start the car and just move it in the shop and you get the 2 drops. Drips from the passenger rear side of the oil pan. Seems to be coming from the rear of engine up high. Have checked all the normal stuff. Oil lines, senders, pan bolts, etc. I can see a little fresh oil between the middle intake runners on the drivers side, but none towards the front or rear. Nor the passenger side. Think it may be something under the plenum? If it is, why do I get the same 2 drops no matter how long I run it? I am open to suggestions. Thanks Guys !!

12-01-2017	#2
garyhugo Join Date: Feb 2010 Location: Jacksonville,FL Posts: 242	Re: Oil Leak Ideas. Help!! Oil pressure switch is my first guess.It's under the oil filter and hard to see. The switch itself will leak just a little where you are speaking of.Not to be confused with the oil pressure sensor.The switch is what lights the oil warning light, the sensor works the gauge. Hope this helps. __________________ Gary 90-1572

12-02-2017	#3
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Oil Leak Ideas. Help!! The attached article will walk you through the usual oil leak suspects. Sounds like you may have a breather box leak under the plenum, however judging from your description it may be the stud for the passenger side exhaust manifold. Oil has a funny way of coming out at places that don’t necessarily correspond to where the leak actually is. Good luck, H http://www.zr1specialist.com/HAT%20W...0the%20LT5.pdf __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

12-02-2017	#4
TX '90 ZR1 Join Date: Oct 2017 Location: TX Posts: 2,038	Re: Oil Leak Ideas. Help!! Thanks garyhugo & Ccmano !! I checked the oil pressure switch under the filter. Not there. From reading the article by Marc I am inclined to think I may have 2 leaks. I am going to check the bolts on the oil pressure regulator cover and the PVC grommet. They are in close proximity to where the oil might be coming from. By the way, this forum is GREAT. Always get informative, knowledgable responses. I REALLY APPRECIATE IT !! Maybe I can return the favors sometime. Thanks again.

12-03-2017	#6
Jitse Join Date: Aug 2013 Location: Holland Posts: 80	Re: Oil Leak Ideas. Help!! Searching for leakages, personally I start with (proper) cleaning the engine. Searching for leakages is much easier then, it helps when you use a mirror and a torch, an videoscope can be handy too. And start it up...