Posted by Dieseltech on July 21, 2018 at 18:39:47 from (199.16.223.157):
In Reply to: Hey Pump Guys posted by Jeff nwoh on July 21, 2018 at 10:33:37:
The very late DB pumps don't use the umbrella seals at all. They use a much larger shaft with a needle bearing for support, and a thrust washer with snap ring to hold it in place in the INSIDE. Special tools are needed to remove/replace the bearing and two housing seals. Pumps with the new setup have a weep hole on the housing BETWEEN the seals, which have different OD sizes. If there's fuel dripping at the hole the fuel side seal is probably bad, and possibly the shaft worn too. Seal is a new Teflon type, and can sometimes cut into the shaft badly over time. Post the complete model number, and I'll see if I can find what you have. Some late brass tube type pumps before the needle bearing pumps did use the snap ring on the shaft too, they don't pull out either. Those did use the umbrella seals, but no weep hole. I've been seeing more of both types lately.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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