Posted by jdemaris on August 25, 2009 at 06:41:10 from (67.142.130.16):
In Reply to: 6.5 chevy diesel posted by Bryan in Iowa on August 25, 2009 at 05:46:22:
There is no proper "rebuild" process for a 6.5. So, I'm curious what exactly was done.
The block is pretty much the same as the later 6.2s and prone to cracking at the main-bearing webs once it gets over 200K miles. The crank is never supposed to be ground since when new, the journals are surface-hardened. It is also only cast-iron instead of the forged steel, like just about every other diesel in the world uses. The heads are lightweight and prone to cracking if overfueled and/or overheated. So, I'd make sure to ask what specifically was done to it.
I've been using 6.2s and 6.5s for years, but also understand their severe limitations for HD use. I would not drive any 6.2 or 6.5 long distance if it has over 150K without pulling the oil pan and inspecting for main-bearing web cracks. One note: sometime around 1998 GM addressed the block cracking problem and made the outside bolts on the main-bearing caps smaller. Made them 10 mm instead of 12 mm. So, if you have 10 mm outside bolts, you've got the stronger block.
If you want a reliable and older diesel puller, get a Dodge with a 5.9 Cummins, or to a lesser degree, a Ford with an IH 7.3 IDI turbo (up to mid 1994), or a later 7.3 DI Powerstroke. Both are worlds better for heavy use, than the 6.5 can ever be. Except: There are now new 6.5s being built with beefed up and high alloy blocks, heavier Chinese heads, and forged steel crankshafts. Sometimes called "Optimizer 6500s" and they cost a fortune. Mostly sold for HUMVEE replacement engines or for marine use.
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