This was a big problem on the medium duty trucks until GM came up with a new rotor. Once the new rotor with a fan built into the bottom side was used I no longer I had a problem with corrosion causing the reluctor to come loose on the shaft. Before the change I had changed several with less than 20,000 miles on them.
I serviced 11 trucks that used that distributor. I used to buy them two or three at a time. I would get a call that the truck was back firing and had no power. I changed quite a few of those distributors with the truck setting on the side of the road.
When that distributor was first used in those trucks in 1990 Schwans started having engines blown pistons. It soon got to the point they were losing more than one engine a week in their fleet. GM was blaming Delco Remy and Delco said it was a problem with the propane conversions. GM finally put a truck on a dyno and sprayed some water under the hood. They blew the engine in a couple on minutes. The same distributor was not causing the same problems with the light duty trucks where it had been used since 88. The difference in air flow patterns caused the problems in the larger trucks. The result was that Delco Remy replaced the distributors in all 90 and 91 Shhwans trucks.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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