Can't find Oil leak [Archive] - Chevelle Tech

: Can't find Oil leak


bluechevelless
Oct 29th, 06, 1:39 PM
My car is leaking oil pretty bad but I cant find where its coming out
The starter is probably the worst part covered in oil, from front to back and its dripping off of it. The header tube next to the starter has a big oil stain on it. The back and bottom of the oil pan has a little bit on it. The transmission and cover and inside the cover has oil over it and tje oil filter has a bit on it.
Ive already checked the oil pressure line for the gauge and both valve covers but they are fine and no oil coming out of them but the head gasket on the back passengers side is covered as well as whats around it.
Any Ideas on what else it might be?
Info is in my sig

Bill Rose
Oct 29th, 06, 2:07 PM
I'd check the intake to back of the block. That is a common place for gasket failure.

Dave
Oct 29th, 06, 2:34 PM
Bill's probably right on this one, but valvecover leaks can be quite deceptive. Clean it all very well, then fire it up. That's how I finnaly found mine.

bluechevelless
Oct 29th, 06, 3:40 PM
Ok I cleaned it up as good as I could and then took a rag and alcohol and cleaned the rear intake gasket area as good as I could then let it dry. I then took a whole bunch of gasket maker all over my 2 fingers and rubbed a hell of a alot on it back there on the seam. So If it still leaks I dont think its leaking there.

Sid Coleman
Oct 29th, 06, 3:53 PM
Just found my 396 leak-it was oil blowing out of the dipstick tube. I'd thought it was a valve cover as well.

tireburner396
Oct 29th, 06, 8:23 PM
The best way to find the leak is to clean it as good as you can, then start it up, and use a mirror and flashlight to find the leak. I found mine at the back of the intake that way. I seriously doubt you will be able to seal the leak without taking the intake off if that is the leak

bluechevelless
Oct 29th, 06, 8:31 PM
The best way to find the leak is to clean it as good as you can, then start it up, and use a mirror and flashlight to find the leak. I found mine at the back of the intake that way. I seriously doubt you will be able to seal the leak without taking the intake off if that is the leak

I did it on the front and it worked so I hoping that it works on the rear

gonracn
Oct 30th, 06, 12:27 AM
Go to your local chevy dealer and get a bottle of dye then go buy you a blacklight bulb and put in a drop light. I found a leak on my race car this way and it works.

Chris R
Oct 30th, 06, 1:51 AM
Is there a lot of dirt and grime one the outside of the engine from the oil leaking?

bluechevelless
Oct 30th, 06, 8:32 AM
Is there a lot of dirt and grime one the outside of the engine from the oil leaking?

No just oil from the leak

charbilly2001
Oct 31st, 06, 12:53 PM
If it is the cross block to manifold gap below the back of the manifold that is leaking you need to get a spray can of "Brakleen" and thoroughly clean the entire area. Brakleen will carry away any oil that is present. After you do that AND the area is very dry take some "Hi Temp" Permatex(Orange) silicone and work it into the gap across the entire rear of the manifold where it crosses the block.

If you don't have a mechanics mirror go get one so that you can look and see that you have filled the entire gap across the block/manifold. If that was the leak AND you do a good job of sealing that gap then your troubles will be over.

If, after that is done, you still have a leak I'd recommend taking a long hard look at how well the valve covers are sealed.

meb
Oct 31st, 06, 10:38 PM
Oil leaks can be tough because the oil can just get blown all over. I resealed my 4-speed and thought one of the arms was leaking. Of course I found this out when the car was finished. It turned out to be the TCS solenoid.

I would blow the thing clean with my power washer and as other have said; you just need to be slow and meticulous. Get the car on a lift or a jack and some jackstands (for added protection). Get under that thing with a good light and look at whats going on. Take your time.

Sounds like it could be the back of a valve cover since that is where a large majority of the oil tends to lie.