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Leaking engine oil- where to start

 
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strange
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PostPosted: Tue Apr 30, 2013 8:44 pm    Post subject:  Leaking engine oil- where to start Reply with quote

Finally got my ABS issue fixed, only to find out as the car was raised that my oil pan was leaking. There was oil splattered all over the pan and areas near the pan. However the entire time it was raised I did not notice not 1 drip hit the floor. Any ideas on where should I start, or ideas on what it can be?
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Lingenfelter
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PostPosted: Tue Apr 30, 2013 9:28 pm    Post subject:   Reply with quote

Get under there and take a look. Give everything a wipedown if there is relatively fresh oil. Take it for a short drive, see what shows up in a second inspection.

I'd expect oilpan gasket, loose oil filter or drainpan bolt, or oil coming off a framerail or control arm from previous oil change.

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PostPosted: Tue Apr 30, 2013 10:22 pm    Post subject:   Reply with quote

The pan generally seeps oil when the car sits. Unless you had it up in the air for a few hours, you wouldn't see a difference. In my experience, if the pan is covered, there is an issue with the oil pan gasket.

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PostPosted: Tue Apr 30, 2013 10:34 pm    Post subject:   Reply with quote

As soon as I replaced my oil pan gasket my oil leak went away. I had the same type problem that you are saying.

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PostPosted: Sat May 25, 2013 6:17 pm    Post subject:   Reply with quote

Degrease and wash your engine, or take it to a car wash and use the brake cleaner or engine cleaner setting. Then see where fresh oil appears.

On the 3400:
1. Check the Oil Pressure Sender on the front of the block. They start leaking internally and will cover the front of the oil pan with oil. Cheap part, easy install, and if it blows out you will lose all your oil FAST.
2. Check about 3" under the throttle body, more than likely your Distributor Oil Pump Drive gasket is leaking. Happens on just about every 2800/3100/3400 engine ever made. GM decided to keep the distributor driven oil pump even after their went to coils. Rolling Eyes Its a $1 seal but you have to remove the upper intake, coolant hoses, and a bunch of other stuff out of the way, not the easiest seal to change on this engine!

Oil pan gaskets are usually blamed for oil leaks, but many times its actually oil flowing down from the top of the engine.

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Vio
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PostPosted: Wed Jun 26, 2013 5:14 pm    Post subject:   Reply with quote

MISHNAH wrote:


2. Check about 3" under the throttle body, more than likely your Distributor Oil Pump Drive gasket is leaking. Happens on just about every 2800/3100/3400 engine ever made. GM decided to keep the distributor driven oil pump even after their went to coils. Rolling Eyes Its a $1 seal but you have to remove the upper intake, coolant hoses, and a bunch of other stuff out of the way, not the easiest seal to change on this engine!



Glad I came across this post instead of asking on a new thread...

Yeah, I've noticed the same thing on mine; it's coming from on top of the engine under the throttle body area and leaking towards the front of the engine and on the starter. For anyone's FYI, the part number for the distributor oil pump drive o-ring is #10477565.
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PostPosted: Mon Jul 01, 2013 2:55 pm    Post subject:   Reply with quote

Just wanted to follow up from my above post -

On Saturday, I removed the upper intake manifold and all the associated hardware in the way and pulled that distributor oil pump drive..the o-ring was cracked in several places and so brittle that when I pulled it off, it disintegrated before my eyes. I could see the path that the oil was leaking...down the front on the starter and on both sides as well, causing the oil pan and transmission pan to be coated in oil.

Several months ago, I thought it was a bad oil pan gasket but that wasn't the case. This was a fairly big job but well worth the time and effort. Hopefully this will aid anyone in tracing back the origin of their leak.
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drew7997
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PostPosted: Sun Sep 01, 2013 9:17 pm    Post subject:   Reply with quote

Vio,
I am glad you were able to repair yours. I assure you, that seal is much, much easier than the 3.8L Oil Pan gasket.
what a pain in the arse.

In any event, I had the same issue. I would run 2000 miles and need a quart. Saw oil all over the pan, re-torqued the bolts, didn't fix (didn't think so either but worth a shot)
I bought a new pan and gasket. My pan was rusting around the oil level sensor so I replaced it as well. I am no longer leaking oil out the oil pan but I am still burning oil at 1q every 2000 miles. I know it's within GM specs, but it's not within Drew's specs!

If anybody has a 3.8L with oil all over the pan, it's probably going to be the Oil Pan Gasket. You are going to need an engine hoist, an offset 15mm wrench and some other standard tools including, of course, the Torque Wrench. [/list]
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