Oil Pump O Ring Question
Thread Starter
Instructor
Joined: Feb 2006
Posts: 143
Likes: 4
From: Wichita KS
Oil Pump O Ring Question
I upgraded the timing chain in my Z06 to the LS2 chain. While I had the oil pump out, I wanted to replace the O ring going to the pick-up tube. The new O ring I got from GM Parts House was green in color and the one that was in the pump was black. I did a search on the internet, and it appears that when you buy a Melling oil pump, it comes with 2 O rings, one black and one green. The green one appears to be a little thicker than the black one.
Do I have the wrong O ring?
Thanks.
Steve
Do I have the wrong O ring?
Thanks.
Steve
Thread Starter
Instructor
Joined: Feb 2006
Posts: 143
Likes: 4
From: Wichita KS
I'm color blind, so I think you may be right - the O ring I got is probably blue. The part number for it is 12557752. The new one is definitely thicker than the original black one, but I have read that there were some issues with the O ring (and Service Bulletins), so GM may have upgraded them to a thicker design and differentiated them by color (similar to the yellow valve springs in the Z06).
Thanks.
Steve
Thanks.
Steve
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
I'm color blind, so I think you may be right - the O ring I got is probably blue. The part number for it is 12557752. The new one is definitely thicker than the original black one, but I have read that there were some issues with the O ring (and Service Bulletins), so GM may have upgraded them to a thicker design and differentiated them by color (similar to the yellow valve springs in the Z06).
Thanks.
Steve
Thanks.
Steve
