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Re: '95 GMC 6.5TD engine
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Posted by Bob on September 07, 2006 at 08:44:25 from (66.163.134.211):
In Reply to: Re: '95 GMC 6.5TD engine posted by billpa on September 07, 2006 at 08:10:02:
EXACTLY. They suffer from main bearing web cracking, and when the main castings eventually separate from the block, the crankshaft is no longer fully supported, and breaks. Sometimes, there is an odd vibration, ot noise for a while, before the crank "lets go". I have three blocks I should take in for scrap that broke up that way. They even have the NAVISTAR Diamond symbol cast into the center valley area of the blocks! I have a "beater" 1985 Suburban, and when I dropped the pan to put in a rear main see last winter, I noticed some pretty good cracks forming in the bearing webs. Since there's no fix, I put the seal in and have been driving it, 10,000 more miles, so far, and it hasn't let go, yet! Who knows, it may happen in the next 100 miles, or after another 20,000 miles. As for what block was best, most 6.2 "afficionadoes" say the 1982 blocks were the best, because they had a high nickel content in the cast iron that was then taken out by the corporate "bean counters". If you get a NEW 6.5 now, they are being cast by NAVISTAR, and machined by GEP (General Engine Products), and are again supposed to have added nickel in the iron, for wear toughness in the bores, and resistance to cracking.
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