Mechanics

OIL LEAK

1984 GMC Jimmy • V8 4WD Automatic • 180,000 miles

I have a 84 GMC Jimmy with a heavy Oil leak. I've done replaced the rear main seal, valve cover gaskets, oil pan gaskets, and its still leaking. What else besides the front main seal could it be?
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Etsuchick86
March 28, 2011.




None of the things you listed will leak real fast. For fast leaks suspect the oil pressure sending unit or the rubber gasket under the oil filter. The gaskets you replaced will typically cause a small spot under the engine where you park, not big puddles. Look for the highest place you find oil on the engine. There is also dye that can be added to the oil after washing the outside of the engine. After driving far enough to make the leak show up, you search with a black light. The dye will appear as a bright yellow stain.

Caradiodoc
Mar 28, 2011.
Thanks so much! I had checked the sending unit it seemed to be fine, but I will check again. I will try the dye nexted what is it called?
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Tiny
Etsuchick86
Mar 31, 2011.
It doesn't have a special name that I'm aware of. If you tell the people at the auto parts store what you're trying to do, they will find the product. The bottle is only about an inch in diameter and about two and a half inches tall. The liquid is dark purple. When you search with a black light, it will show up bright yellow.

Caradiodoc
Mar 31, 2011.
Yea I got the dye today, and going to try it tomorrow. : ) Thanks

Tiny
Etsuchick86
Apr 1, 2011.
I own a 1986 gmc jimmy 4x4 and it is currently leaking oil but I don't know how to locate the leak. Any tips?

Tiny
Edmora
Aug 15, 2014.

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