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Oliver 70 won't run right

R

Raydex 234

Member
I have an Oliver 70 that will not run unless the choke is all the way out. I have had the carb apart and cleaned it. I think I have all the passages cleaned out. I am not sure if it has a vacuum leak past the throttle shafts. Could the governor cause any problems or is there some junk in one of the passages that I haven't gotten out. I have the throttle 1/2 way the choke all the way out and it will idle. I have adjusted the main jet and the idle screw according to the kit. If I start pushing the choke in it will speed up then die. I have done a distributor tune up and new plugs. I have had this tractor for 17 years and I just started it this weekend. Any suggestions.
 
If it will continue to run as stated, it has junk in the main jet or passage to the jet, or it could be a vacuum leak at the manifold. Do the following outside: use a propane torch with the tip taken off so pure propane comes out. with it running move the torch all around the manifold and its attachment to the block. If it change RPM when near a certain area, it has a vacuum leak there. Jim
 
I think I soaked it in a carb tank soaker about 12 years ago. It was kind of a basket case carb. The tractor was kind of cobbled up when we got it. I put a kit in it. I believe I also used carb spray out of a can to clean all the ports out. It sat in the parts cabinet until today. After I could not make it run right I took it apart and sprayed carb cleaner on it again. Could I not have the venturi in it the right way so it can not pull fuel. To me it seems like there is only one way that venturi can go in there.
 
probably is a dirty carb or vac leak.. but check spark for the heck of it. weak orange spark likes a rich mix.

a fingerfull of grease rubbed around the carb to manifold, carb halves and choke / throttle shafts will temporarily stop vac leaks for testing.

lastly. if you ever think it s a gov issue. disconnect gov throttle rod and run butterfly manually to test.
 
I also forgot to mention that there is some gas seeping out of the weep hole where the air cleaner hose hooks up to it. What would cause that?
 
Sounds like something blocking the main jet circuit or possibly lack of fuel entering the bowl.

Be sure you have good flow of fuel to the carb.

If the flow is good, take the carb back apart and go over everything again. If you have the instruction sheet follow it closely, especially the float level setting.

Knowing the basic theory of each circuit of fuel delivery helps. Might search the carb model under "images" and get a cut away view of how it works.

Doesn't sound like a vacuum leak. If it is a vacuum leak, it would be a very bad leak, you should hear it. The throttle bushing would have to be severely worn to cause this, not likely. The governor would have no effect on the mixture, just the engine speed in relation to throttle position.
 
I had a JD 55 combine do that.Finally got so it would not run at all. A flake of (green) paint somehow got past the 'filters' and was blocking the inlet side of the needle valve.
 
Most old cast iron tractor carburetors can only be cleaned by mechanically cleaning the passages. no chemical or solvent will do that. take that carb apart to the last screw, thoroughly clean each passage, and I'll bet your problems disappear.
 
Having once owned one, that sounds normal for an Oliver 70.

Actually, the 70 we owned didn't run too bad if you could ever get the dammed thing started.
 
(quoted from post at 17:59:18 04/12/14) I think I soaked it in a carb tank soaker about 12 years ago. It was kind of a basket case carb. The tractor was kind of cobbled up when we got it. I put a kit in it. I believe I also used carb spray out of a can to clean all the ports out. It sat in the parts cabinet until today. After I could not make it run right I took it apart and sprayed carb cleaner on it again. Could I not have the venturi in it the right way so it can not pull fuel. To me it seems like there is only one way that venturi can go in there.
Click to expand...

To clean the passages you need to run some fine wire through them. larger passages larger wire.
 
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