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Posted by Clint Dixon [74.206.62.94] on Friday, September 02, 2011 at 20:47:09 :
I have not been visiting the Forum recently on a regular basis. I just read of your problems with limited engine rpms on the last Forum.
I have never had a VA distributor on a Power-Wagon, so I can not say whether this could be causing your problem, but, I do know that the governor could definitely be the problem.
It is an added bonus that you found one with a factory sealed cover and sealed plugs over the adjustment screws. This of course would indicate that the governor has never been tampered with. That means that the internal adjustments SHOULD all be set to the factory specifications, assuming that the person who set it up actually did it correctly. But even so, the internal governor springs can weaken and stretch over time due to age and the fact that while the engine is not running, the springs are under constant tension due to the heavier spring in the accelerator pedal linkage keeping the throttle plate closed. The factory owners manual SHOULD have advised owners to pull the hand throttle all of the way out when the truck was parked and not in use. If they had done that, there would be a LOT more good integral carburetor governor springs around today.
The symptoms you describe are exactly what I would expect to happen from a governor whose springs are stretched and/or weakened. The sad fact is that you could break the factory seals and tamper with the settings to something other than factory, but you can never really compensate for stretched/damaged/weakened springs. The governor geometry is complicated. You may be able to make it work to your liking, but it will probably never be exactly like original. And then, the springs are just going to weaken and stretch further.
As you know, you can not remove a governor from a factory equipped 1946-1953 Power-Wagon, because in doing so, you remove the carburetors throttle plate. You can only render the integral governor useless as far as its original design. Your factory sealed governor has some value as a display. I would suggest NOT breaking the original seals. It may be of more benefit to the hobby, and to the operation of your truck, to find another governor that has already been opened and try tweaking it to work or to bypass the governor operation.
Sorry to be the bearer of bad news. I hope it actually turns out to be something related to the distributor, but your description of the problem is classic governor related.
Junior
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