2007 yukon denali oil leak
- Thread starter bangon
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
strutaeng
Full Access Member
Clean up the area real good and put some dye in the oil.
The rear main seal is always tricky. When mine leaked the area behind the flex plate holes looked pretty dry. It was not until I added the dye, that I was able to see with black light, right at the right spot under the crank pulley (6 o'clock) I could see the drip.
Ditto on addition RTV on the oil pan gasket corners.
The oil cooler lines or block-off plate is another good place to check.
The rear main seal is always tricky. When mine leaked the area behind the flex plate holes looked pretty dry. It was not until I added the dye, that I was able to see with black light, right at the right spot under the crank pulley (6 o'clock) I could see the drip.
Ditto on addition RTV on the oil pan gasket corners.
The oil cooler lines or block-off plate is another good place to check.
Yes we did. Super clean when we did it
It's probably the rear housing plate gasket that holds the RMS. It'll leak higher up and drain down. Lived with mine for 40k, then pulled the trans and replaced the cover. The seal was dry, the cover gasket gets stiff and compressed.
Pretty much what I think too. Thank you
Check the valley plate bolts for tightness too - at least the ones you can reach. We've seen that gasket take a set too, and leak because the bolts no longer have anything to press against.
Airman68
Full Access Member
Is this on all engine versions? I have a 5.3. I have had a mystery oil leak for a long time. Mosly just irritating since I cant find it. I did have valve covers leaking a bit which was some of it and the block off plate too.
Charlie207
Full Access Member
Yes.
donjetman
Full Access Member
- Joined
- Oct 22, 2018
- Posts
- 1,977
- Reaction score
- 3,618
I recently had the intake manifold off on our 07 6.2 Denali w/197k miles and all valley cover bolts were tight.
Last edited:
Charlie207
Full Access Member
It's usually the oil pressure sender back there that seeps.
(also, rec-port heads FTW)
Yes, all the LS (4.8, 5.3, 6.0, 6.2) motors use the same style plate and seal assembly I believe.
HAHA that's nothing mine looks like Le Brea tar pits under there but when you look though the inspection cover in the bell housing it's bone dry inside. I'm getting ready to replace the oil pan (drain plug is stripped), gasket, pickup tube o-ring and install oil diverter on the relief valve soon.
davidavidd
Member
Lol, I've lost count of how many times I've shared this video here, but I know what it feels like, I'm almost going crazy trying to find the source of this leak.
Other possible origins: valve covers, oil pressure sensor and an unlikely but not impossible cause, a hairline crack in the engine block.
Other possible origins: valve covers, oil pressure sensor and an unlikely but not impossible cause, a hairline crack in the engine block.
Airman68
Full Access Member
It's funny how my Yukon was leaking, then mysteriously stopped... I give... When it leaks it's really just drips not puddles so I'll probably live with it. If I park it for extended times, I just put cardboard under it. It's a 2008, can't expect perfection at this point. It runs good and it's paid for.
Similar threads
