help with bolt identification
Thread Starter
Heel & Toe
Joined: Mar 2019
Posts: 24
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help with bolt identification
i have a oil leak, can any one tell me the name of the bolt in the yellow circle?
can you leak oil from where this bolt is located?
mine is missing on my 1999 c5.
thanks in advance!
can you leak oil from where this bolt is located?
mine is missing on my 1999 c5.
thanks in advance!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Damn, Brother!! 
That's the rear bearing side bolt. Once the rear main bearing is properly torqued, that bolt is installed and torqued for added rear main bearing lower block support. Yes, its supposed to have a special bolt in that hole. Pull one of the OTHER bolts out and get another one just like it from the dealer.
You can see it installed in this picture LINK ATTACHED:
https://www.google.com/search?q=ls1+...POe3Tmdcde3ZM:
Do the other holes in the same area on the block have bolts in the holes????????????
That's the rear bearing side bolt. Once the rear main bearing is properly torqued, that bolt is installed and torqued for added rear main bearing lower block support. Yes, its supposed to have a special bolt in that hole. Pull one of the OTHER bolts out and get another one just like it from the dealer. You can see it installed in this picture LINK ATTACHED:
https://www.google.com/search?q=ls1+...POe3Tmdcde3ZM:
Do the other holes in the same area on the block have bolts in the holes????????????
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Check out this link and you can see where they fit into the actual main bearings. The LS engines have a DEEP block and that allows the the main bearing to have extra support in that area:
https://www.google.com/search?tbm=is...PlMEM5SNullUM:
Its called a side main cap bolt:
https://www.google.com/search?tbm=is...H6xKvgOyPFxr_M:
https://www.google.com/search?tbm=is...PlMEM5SNullUM:
Its called a side main cap bolt:
https://www.google.com/search?tbm=is...H6xKvgOyPFxr_M:
Last edited by Bill Curlee; Aug 15, 2019 at 02:01 PM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Please update us on the status of the other bolts and if you find the correct bolt. Its probably a standard GM Metric bolt but, I have never needed to do anything with all the engines that I have worked on.
Bill
Bill
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Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Yes, I saw that also,, Looks like he has more than one thats missing,, That's why I recommended that he check the others. My guess, someone's been in the engine before. Hope he gets back to us on an UP-DATE.
Bill
Bill
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From: South Hill Wa
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Yep!!! The RUST confirms that its an iron block!!
Aluminum doesn't rust and the LS block isn't painted..
Bill
Aluminum doesn't rust and the LS block isn't painted..
Bill
Last edited by Bill Curlee; Aug 24, 2019 at 10:15 PM.