dacaseguy

Member
After several months of cleaning, rebuilding, painting and reassembling I fired up the 1951 VAC. Only thing I done to the engine was a valve job. I still need to paint the hood and fenders. It started right up but won't idle unless I hold back on the carb throttle lever? This was a donor engine out of another VAC and they had a spring tied onto the carb throttle lever to make it idle? I'm wondering if its the governor? Dick
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No,I fixed the linkage rubbing the oil filter. I even disconnected the linkage from the throttle lever and still have the issue with the carb not idling back. Dick
 
m new here but is the idle screw set too slow or mixture adjustment too lean? I got 2 working vac's and a nice 312.sometimes I have to open the idle mixture screw a tad to get a good idle
 
Have you checked to be sure that the linkage is adjusted to match the carburetor. Also, there were 3 different throttle rods used during the total series run of the VA tractors. Since you have swapped engines you may not have the correct one to match the governor setup in the engine. Lee
 
I'm sticking with carb adjustment and throttle stop screw adjustment . even with rong rod or hitting oil filter it should idle if he holds it with his hand. also id like to see a better view of those rear weights,are they genuine case or aftermarket? don't look like any of my case weights.they look pretty darn heavy too
 
I pulled this engine from a 49 and installed it in a 51 VAC.I used the same carb. They had a spring on the back side of the carb hooked to the throttle arm. On that tractor, it would not idle with out that spring. They possibly had the wrong rod or it was adjusted to short? I have the rod and spring on thr distributer side unhooked and it won't idle. Do you think I need to lengthen the rod from carb to governor arm? Dick
 
The rod style changed mid 1949 (After 5365686) when the governor changed to the flyweight type. The early rod has a minor offset and is adjustable on one end. The later rod has a more pronounced offset and is adjustable on both ends. Not having both off and trying to measure them on the tractor there appears to be about 1/2" difference in length with the later style being longer. That could also vary with how they are adjusted. Since you can pull it back to idle I would try adjusting the linkage. The procedure that seems to work best is to push the hand throttle wide open. Then with the carb throttle shaft unhooked and also held in the fully open position the rod should hook up without moving either. This puts the governor in the optimum working position. When you have the linkage unhooked be sure that it moves freely. With the spring and carb unhooked it should move very easily as there is not a direct connection internally, just a lever pushing against a plate. I know the reply is long but I hope you understand the procedure and it will help. Lee
 

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