6.0 Cam bearing failures
Banned
Joined: Aug 2006
Posts: 326
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From: North Bay, CA
Did you gloss over the part where I said there's a GM issued TSB addressing the improper parts selection for techs to address this issue at the dealership? So yes, GM has actually in fact admitted that they did it wrong.
On the GeorgeG engine mentioned earlier in this thread...here is what I did:
iron block 6.0 core gen III, the factory bearings knocked out pretty easy. The new cam bearings (durabond CH10's) when we installed them, went in easy. Too easy for my liking. The cam to bearing oil clearance was checked and was excessive around .007"
The cam bearing bores were large in that block. Had we known, we would have kicked that core to the curb but the bore/hone, line hone, and decking were already done and had to find a solution.
Called up Durabond and they sourced a p/n for a bearing ending in -X p/n, it was .020 under size if I recall. These pressed into the block tighter, and we used the green Loctite as insurance. The ID of the cam bearings was then finished on the boring bar to set oil clearance to the cam journals at .003"
iron block 6.0 core gen III, the factory bearings knocked out pretty easy. The new cam bearings (durabond CH10's) when we installed them, went in easy. Too easy for my liking. The cam to bearing oil clearance was checked and was excessive around .007"
The cam bearing bores were large in that block. Had we known, we would have kicked that core to the curb but the bore/hone, line hone, and decking were already done and had to find a solution.
Called up Durabond and they sourced a p/n for a bearing ending in -X p/n, it was .020 under size if I recall. These pressed into the block tighter, and we used the green Loctite as insurance. The ID of the cam bearings was then finished on the boring bar to set oil clearance to the cam journals at .003"
If they went in too easy then you might have the 2nd design block. It has a Cam Bearing Bore that is .020" larger than the 1 st design. If you dial bore gauge the bore and it is 2.327 you have a first design and should use the CH-10 bearings. If you have bore diameter of 2.347 then you have second design and should use the CH-23 bearing set. Both these part numbers are Dura-Bond numbers and can be cross referenced into the other bearing manufacturers.
On the GeorgeG engine mentioned earlier in this thread...here is what I did:
iron block 6.0 core gen III, the factory bearings knocked out pretty easy. The new cam bearings (durabond CH10's) when we installed them, went in easy. Too easy for my liking. The cam to bearing oil clearance was checked and was excessive around .007"
The cam bearing bores were large in that block. Had we known, we would have kicked that core to the curb but the bore/hone, line hone, and decking were already done and had to find a solution.
Called up Durabond and they sourced a p/n for a bearing ending in -X p/n, it was .020 under size if I recall. These pressed into the block tighter, and we used the green Loctite as insurance. The ID of the cam bearings was then finished on the boring bar to set oil clearance to the cam journals at .003"
iron block 6.0 core gen III, the factory bearings knocked out pretty easy. The new cam bearings (durabond CH10's) when we installed them, went in easy. Too easy for my liking. The cam to bearing oil clearance was checked and was excessive around .007"
The cam bearing bores were large in that block. Had we known, we would have kicked that core to the curb but the bore/hone, line hone, and decking were already done and had to find a solution.
Called up Durabond and they sourced a p/n for a bearing ending in -X p/n, it was .020 under size if I recall. These pressed into the block tighter, and we used the green Loctite as insurance. The ID of the cam bearings was then finished on the boring bar to set oil clearance to the cam journals at .003"
Registered User
Joined: Nov 2022
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ry6 steel or aluminum I've read where the 6.0 blocks have spun the cam bearings in the cam bores. Does this seem to be an issue only with the iron blocks? Gen III or gen IV related? Issues with the alum LS2 block?
I'm looking to purchase a new block for my build, was wondering between iron or alum. I could care less about the weight difference, more towards the cam bearing issues. Feedback?
I'm looking to purchase a new block for my build, was wondering between iron or alum. I could care less about the weight difference, more towards the cam bearing issues. Feedback?
after they put the bearings in they line hone them and in some they will spin a bearing so that they are not lined up with the oiler holes and others they will peel them right down to the copper so what I'm saying is if you put the cam bearings in there appropriate holes or bore it and put needle bearings in you should not have A problem with any of them rather it be aluminum or steel
Staging Lane
Joined: Mar 2022
Posts: 84
Likes: 40
From: Wenatchee WA
so the problem is not with the block its self the problem lies in the way gm puts them together in the factory they mass produce these engines and in the way they slam them together
after they put the bearings in they line hone them and in some they will spin a bearing so that they are not lined up with the oiler holes and others they will peel them right down to the copper so what I'm saying is if you put the cam bearings in there appropriate holes or bore it and put needle bearings in you should not have A problem with any of them rather it be aluminum or steel
after they put the bearings in they line hone them and in some they will spin a bearing so that they are not lined up with the oiler holes and others they will peel them right down to the copper so what I'm saying is if you put the cam bearings in there appropriate holes or bore it and put needle bearings in you should not have A problem with any of them rather it be aluminum or steel
