Engine oil leak at 4WD disconnect - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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  #1  
Old 04-15-2019, 11:38 AM
KHE KHE is offline
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Join Date: Jul 2009
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Engine oil leak at 4WD disconnect

2003 Envoy, 151300 miles.

There is an engine oil leak at the 4WD disconnect on the passenger side. Previous owner (Dad) rebuilt the 4WD disconnect and noticed the leak afterward.

It only leaks when the vehicle is driven and when it does, it leaks like a sieve.

When the disconnect was removed, it wasn't seized into the oil pan. I'm not sure how engine oil is leaking out - isn't the pass through the oil pan sealed?

A picture is attached of the leak area.
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  #2  
Old 04-18-2019, 08:42 AM
KHE KHE is offline
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The disconnect was removed last night and the problem was obvious - There was a hole in the oil pan (at about the 1:30 position). The leak path was obvious.

Upon further investigation, the longer disconnect to oil pan mounting bolts were interchanged with the shorter disconnect half bolts when the disconnect was rebuilt. When the assembly was bolted into place, the snub end of the bolt punched a hole in the pan.

I am looking at having someone TIG weld the oil pan but the cost of having the welder come out and weld the pan might be as much or more than a new pan. Rockauto has an oil pan for $141.00.

It looks like the oil pan can be removed from the vehicle after the A/C compressor is unbolted and a couple of frame cross members are removed as well as the differential. Can anyone comment on that process?
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  #3  
Old 04-18-2019, 07:33 PM
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flyboy2610 flyboy2610 is offline
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2004 Chevy TrailBlazer LS EXT
Summit White 4.2L I6 4X4
Join Date: Feb 2019
Location: Lincoln, Ne.
Posts: 33
This guy replaced his oil pickup, which necessitates removing the oil pan. I think the front cover has to come off, too. This is for the 4.2L I6.

https://www.youtube.com/watch?v=sfq8wB6F82o
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