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12-Sep-99 Rebuilding a GMC 6-71 Blower Part 1

Rebuilding a GMC 6-71 Blower Part 1



ImageAt the last Labor Day Rod Run in Sioux Falls, SD. I met up with friend and fellow street rodder Everrett Hohn. Everrett's been rebuilding blowers for over 30 years, so if anyone knows their stuff it's him. He located a good core and the price was right. But there were a few things to do before sending it off to the polisher. Once back from polishing, we'll do a step-by-step on Everrett's rebuild. Should be interesting!
ImageYou can see the hanging tabs from it's life on a GMC Diesel. We will cut these tabs off and re-form the two ribs to match the center one. You can see the rubber mat it's resting on. Great care should be taken to not damage the gasket surfaces.

(model Reade Nelson)
ImageThe two extra support bars can come out because the added strength is no longer needed since it's no longer hanging sideways on a big diesel engine. This should increase the flow a little too. We will use a screen gasket here to help atomize the fuel and keep small parts from ending up inside the blower.

(model Stewart Schramm)
ImageA regular hand hacksaw was used to remove the tabs. Care was taken to make a straight clean cut. If you have access to a power hacksaw or band saw, they would work good also, but this is only aluminum, and I can use the exercise.
ImageThe ribs were marked and ground with an angle grinder to the approximate shape then a belt sander was used to achive a straight line. Once both ribs were shaped the same as the center one, they were rounded a little using the angle grinder and then hand sanded to get the same smoth shape as original.
ImageHere it is ready to go to the polisher. This blower has probably gone a million miles on some semi and will go a million more after Everrett works his magic! He has some tricks up his sleeve that we'll pass along when the time comes.

The polished front plate shows what to expect when finished. This plate looked as dull and wrinkled as the blower before it was polished. I was fortunate enough to find a pre-polished one from a friend and save a little money.