Posted by JD Seller on May 28, 2013 at 21:13:05 from (208.126.196.144):
Many of us on here talk about the flex ring falling apart on a RoosaMaster/Stanadyne injection pump that will cause it to plug up the injection pump. Well here are some pictures of the flex ring, governor weight cage, and the new solid weight cage that eliminates the flex ring.
Here is a new flex ring. It is just a piece of plastic/rubber with a row of hole around it. The hole fit over a row of pins that are kind of like rivets on the back of the governor weight cage and its internal drive. Its purpose was to dampen sudden changes in RPM that could cause an issue with the governor weights and cage.
Here is the old style of weight cage. You can see the pins/rivets on the back side of it. The flex ring fits over these pins/rivets. IF you look close you can see the remains of an old flex ring under some of the pins. The old flex rings where a black rubber like substance.
Here is a flex ring being installed on the old style governor cage. It is a real pain to do. It helps if the flex ring is soaked in hot water before installation.
Here is the newer style of solid governor weight cage. You can see where it does not use the flex ring. The only issue I have every had is some smaller engines may "hunt" RPMs at low idle. I have only had it happen on one tractor out of I bet fifty I have installed. This style should not be used on automotive DB pumps. They have too many sudden RPM changes. There is a newer style for them too that does away with the flex ring also. They call it and "EDI" (elastomer insert drive) weight cage.
This post was edited by JD Seller at 07:14:19 05/29/13.
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