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Oliver 7300 engine surging

R

rrlund

Well-known Member
I've got a LITTLE problem with the 318 Chrysler gas in that 7300 Oliver combine. I had trouble keeping it running at all at first. I changed points and plugs,set the gaps by the book. Problem was in the fuel system. There was a huge slug of rust in the neck of the sediment bowl and up in the bottom of the tank. I took the carb off,it wasn't gummy,but had some rust in it.It's just a 2 bbl downdraft automotive type carb. After I cleaned it and put it back on,it runs super strong,but it surges to beat the band. Probably 2-3 times per second when it's running wide open. At a dead idle,with the throttle in the "off" position,it runs excellent. Move it up to the "idle" position and it sounds like it's missing and it surges. The darndest thing is,the governor lever doesn't move when it's doing it. The only time it smoothes out is going up hill on the road. I can't jam enough oats up the feederhouse to smooth it out when I'm cutting.I've adjusted the carb and timing six ways from Sunday and it doesn't make any difference. I'm just afraid of getting the cylinder drive chain whipping and doing some real damage to the seperator. Any ideas?
 
That governor and carb just plain have to be out of synchronization with each other.

One's pullin' 'er open and the other is then immediately yankin' 'er back shut. Round and round and round again.

Big boys tell me that anytime a carb is removed that ya have to re-adjust one to the other.

Dunno,

Allan
 
Yep, Allen's 100 % correct ya got to re scyn. the governor to the carb. Then ya have to set the RPM to the machine . Now i am not really up to date on Oil all over combines but ya need a hand held tach and if like most must be set off the shaft .
 

You may possibly still have some crud and rust in the idle curcuit of that carb. John Deere 2 cylinder carbs are notorious for those same symptoms IF they are not 100% clean inside.
 
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