Re: '95 GMC 6.5TD engine

Posted by jdemaris on September 07, 2006 at 12:10:57 from (69.67.230.145):

In Reply to: Re: '95 GMC 6.5TD engine posted by Bob on September 07, 2006 at 08:44:25:

The high-nickel blocks show up now and then. Yes, the first 1982s had it. So did many later military-spec. engines. At one time, the blocks were color-coded and stamped to indicate high-nickel content. GM also did it with various high-performance gas engines. I've got a high-nickel block 327 from the late 60s and also had a Z-28 302 that had it.
But, besides the alloy used, the casting thickness was reduced in 94.
In regard to the block main-bearing webs breaking first and thus causing the crank to break? Could be - in some cases. But, I also know of few 6.2s and 6.5s that broke cranks and still ran - with all main-bearing supports still intact. One 6.2 I looked at broke behind the rear-main - so the flywheel was no longer attached.
The guy that started and owns the 6.2-6.5 diesel Website says he believes such failures are due to worn harmonic balancers. I personally, don't believe it. I suspect the cranks are cast (not forged) and simply not durable enough to last forever - and sometimes much less. With bigger diesels, especially in road-tractors and farm tractors, we had many high-hour cranks welded and reground and I never saw one fail (break to pieces) like my 6.2 did. I did have an IH B-275 ag. diesel tractor that had all its main bearing webs crack.

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