Posted by coonie minnie on August 18, 2016 at 18:24:23 from (50.124.116.181):
In Reply to: gm diesel posted by gbs on August 17, 2016 at 18:20:31:
There certainly were a lot of them out there, in many applications.
I still have a 6v71 in an old Fox self propelled we use to open fields for silage harvest. In that application, running at 22oo RPM, it is fine. Loud, but fine.
We also had a 471 on an irrigation pump for about 30 years... or perhaps I should say we had 3. While it was economical to run, it had a really poor safety shut-off system- a must on an irrigation pump, that often times was run for days. The common system on most pumps is a Murphy... which if there is a broken wire, poor connection, etc will immediately stop the engine. Detroit worked the other way... you needed a complete circuit to shut her down, which was slamming the door shut on the blower. So if a wire rattled loose, or a sender failed, it would keep running. Twice we had failures of the oil pressure sender, so the leak in the sender allowed the oil pump to pump the crankcase dry, and of course, the sender failure never shut the engine off.
Remarkably, after it cooled off, the thing would start and run, but that kind of dependability can't be tolerated. A new Deere unit replaced the old 471 in 2001. I wouldn't go back. They were a neat technology in their day, but I'm glad I don't have to lean on it any more.
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