Gas engine racing during idle.

[roache]

Gas engine while idling suddenly races, going beyond red line.
Been chasing my tail on the carburetor adjustments to no avail.
Just put in rebuilt carb because old one did the same thing.
Should I now look at the governor, for which I have limited knowledge ?
Could use some help on this.
Thanks in advance.
John

[Don87]

What engine, vehilce, carb are we looking at?

[Leejohn]

Pull recoil cover off and you can see the governor linkage and the blade. One or both are broke.

[creekbend]

Perhaps this will be of some assistance? BTW, Welcome aboard and Best Wishes. What Causes Surging in Car Engines? | eHow.com

[roache]

What engine, vehilce, carb are we looking at?

Good Morning,

Thank you for your interest.

Tractor is an IH2400A backhoe, same as IH 454.
1973 gas, 4 cylinder, 50 hp, 157 cubic inches.
Carb is a Marvel Schebler, linkage is "throttle down ".
Only two adjustments, fuel mixture and idle speed.
Will always race while idling after a minute or so.
Thanks,
John

[roache]

Thank you John,

Don is going to look at and probably give an opinion on the carb.

I will inspect the governor as suggested. Never looked at one, but if it is broken, then it doesn't matter if I am not careful.
John

[Gator6x4]

Something is wrong in the governor circuit. Sounds like the gear is either worn out or has broken.

[roache]

Much obliged CreekBend,
I can only afford older used machinery.

Somewhat handy, but very short on knowledge.

Of course none of the machines come with manalor service records.
Feels good to be in such fine company.

[DJ54]

Just a guess, but sounds like the bumper spring under the governor cover is broken. #1 in exploded view below. While apart, better check the thrust bearing (#11) too, while the cover is off.

Spring looks to be about $32.00,and that bearing (hope yours is OK..!!) is right at $118.00 through Case/IH.

Guess that's cheaper than the engine having pups...

[roache]

Just a guess, but sounds like the bumper spring under the governor cover is broken. #1 in exploded view below. While apart, better check the thrust bearing (#11) too, while the cover is off.

Spring looks to be about $32.00,and that bearing (hope yours is OK..!!) is right at $118.00 through Case/IH.

Guess that's cheaper than the engine having pups...

Many thanks "DJ" for both the analysis and especially the exploded diagram.
Was intimidated just looking at the governor housing. Will check it out in the light tomorrow.
Hydraulics and engine great, hate to walk away from the machine.