Tired of the oil leaks
 

So my H2 has had a drip here and a drip there for some time. I finally tracked it down to the oil cooler lines and a valve cover gasket. So today I installed a oil cooler block off plate and new valve cover gaskets. I added a little color while I was at it. I was extremely happy with how clean the valve train is after 170,000 plus miles.

https://cimg9.ibsrv.net/gimg/www.hum...388b35df03.jpg
https://cimg0.ibsrv.net/gimg/www.hum...161ee6b091.jpg
https://cimg1.ibsrv.net/gimg/www.hum...b0fb6e4c35.jpg

looks good, that is clean, what oil do you use?

I feel fairly confident that my oil cooler port is leaking as well, why did you block it off instead of replacing gasket/lines.

are you missing manifold bolt towards the firewall?

99.9999% Mobile 1 synthetic on all oil changes and maybe once a year a half container of Marvel Mystery Oil for a few miles before oil change.

Tim

A few reasons. The block off plate was a whopping $18, so it was the easiest way to find out if my leak was indeed coming from the oil cooler lines. New lines are upwards of $120 and a pain in the ass to get to for replacement. All I did was disconnect the connection block and threw in the new plate, I left the lines in place for now. I also would have wanted to change over to lines from a newer Hummer with electric fans as I just tried to convert mine but failed because the 2005 lines do not offer the clearance needed for electric fans. I also don't know that an oil cooler is an absolute necessity. These Gen III engines are some of the only LS engines with an external oil cooler so I didn't think it would hurt. My overall temps are really low as it is from the new 3 core radiator. I will probably put new lines on it when and if I go with headers but that's another project.

Tim

Don't think so. I put new knock sensor in it a few years back and had no issues. What are you seeing?


Tim

I think he meant exhaust manifold bolts which don’t need to be removed for the knock sensors. From the picture your rear most exhaust manifold head seems to be missing.

Yes I have a few broken exhaust bolts. I'll get into t hat another day.

Tim

If mine oil lines were bad I would block them off, I don't have the need for the cooler anymore. I love the orange valve covers.