Re: 8v71 Detroit diesel

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Posted by Dennis Benson on December 05, 2002 at 20:41:22 from (152.163.188.227):

In Reply to: 8v71 Detroit diesel posted by Christopher on December 05, 2002 at 18:16:48:

I used to work on a lot of heads from the Detroit Diesels. the 71 series has 4 exhaust valves per cylinder with the injector centered in the middle. The intake are ports on the side of the cylinders that the piston uncovers. The heads crack between valve seats. The valve seats can be knocked out, the cracks can usually be repaired with tapered plugs, and the seat bore can be recut for new seats. More extensively the heads can crack into the injector port which has a copper sleeve sealing the water jacket. We were not able to repair these cracks in the shop I worked for, but other shops could fix them, and install a new copper sleeve. Those shops welded cracks, our shop didn't weld. Water in the combustion chamber will make parts look like a sponge. Also, I found a lot of ports blocked with a gooey sludge that sandblasting wouldn't touch.

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