Sat Mar 23, 2013 8:03 pm
Today - we disassembled the governor. Below I've listed a couple of findings.
1. The flyweights have been going out so far for so long, they've actually worn a groove on the inside of the governor housing. - What's the most common cause of this?
2. The the linkage on the top has play in the keyway where the spring attaches.
3. I've read the power point on the rebuild but really I'm not too sure what needs to be rebuilt.
Thanks again - Ken
Sat Mar 23, 2013 8:17 pm
I have seen several lately where the weights are rubbing the housing, and all the ones I have checked closely had the pivot pins and/or the holes in the weights worn. The hole seems to wear worse on one end of the weight than the other. End with tab that runs against thrust bearing if I recall correctly.
Sat Mar 23, 2013 8:44 pm
Thanks John - I saw in the power point text that you can fill the holes with braise and redrill - While I've got a nice shop I don't have that type of machine shop. Guess I'm down for some new parts.....
Sun Mar 24, 2013 9:15 am
Look to three of the Blue Ribbon Service Manuals for the specifications and tolerances for the governor components.
GSS-1008 Specifications Manual, pages 21 and 22
GSS-1411 Service Manual, page 2-14
GSS-1132 Fuel System-Carbureted Engines Manual, page 21
Using the tolerances that are spelled out in these three manuals should help to give you a good idea as to what would need to be replaced. A little wear and slop in each part will add up to a lot of wear overall, especially when you are working in a tight and confined space, such as a governor housing. One tolerance/measurment that is not found in any of these manual is the original thickness of the actual thrust bearing (43 481 D). As new, this bearing should measure 0.406" in thickness.
The GSS-1411 Service Manual on page 2-14 it is stated that in regards to the decision of what new parts should be used to rebuild the governor assembly will be based upon the wear found and the condition of parts found: “Weights, pins, and weight carrier: Clearance in excess of 0.003 inch over that specified between pins and weights or carrier.”
Governor weight to pin clearance is 0.001” to 0.004”
Excess clearance tolerance is 0.003”
Maximum allowable clearance should be 0.007”
The recent governor that I had taken apart to rebuild, while still "fuctional", was abolutely shot internally. About the only good parts left were the housing and the pins for the governor fly-weights. The thrust sleeve (251 459 R1) was worn 0.009" undersize from the original tolerance. The top of the thrust sleeve had worn down against the snap ring ring on the shaft to the ponit where the snap ring was sitting into the thrust sleeve about another 0.009", right there is almost 0.020" in wear/play/slop. The arms of the tedder fork had grooves worn into them from the thrust bearing 0.008" deep, and the arms on the fly-weights that ride against the thrust sleeve had grooves worn about the same depth as well. If you add up these four points, you are already at 0.032" or 1/32" in wear, this wear will allow the weights to be thrown out further than normal. Check all of the parts against there original specification and use good judgement
Tue Mar 26, 2013 8:31 pm
Thanks Criswell. I've got it fully apart now. I've mic'd a few things but have not recorded them yet.
I can tell you the brass busing is SHOT, the seal at the needle bearing is shot, the thrust bearing is 0.0004 under. The pin that holds the weight carrier on the shaft is worn in opposite sides, quite noticeably. The thrust busing on the bottom, has the normal circular wear, but there are places were it looks like it was not spinning yet the weights were still moving in and out to make the grooves in that surface - couple different locations. Where the spring attaches outside the governor housing there is play in the keys there.
Gotta travel for business tomorrow. Be back Thursday night. BTW - the manual details you provided we're awesome.
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