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  1. #1
    New Member
    Join Date
    Oct 2012
    Posts
    13
    Location
    Andover Connecticut
    Tractor
    IH 2400A backhoe..,NH L865 skid steer, IH 185 LoBoy, Kubota L2250 WalMart Murray 20 hp rider, my workhorse

    Default Gas engine racing during idle.

    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

  2. #2
    Elite Member Don87's Avatar
    Join Date
    May 2010
    Posts
    4,226
    Location
    SW Pa.
    Tractor
    Massey Ferguson GC2400

    Default Re: Gas engine racing during idle.

    What engine, vehilce, carb are we looking at?
    Don

    MF GC2400, FEL, 60in.MMM, 5ft. Cultivator, Single Bottom Plow, Bush Hog RTC48 tiller, MF 2360 front mount snowblower, 5ft backblade. BXpanded Piranha toothbar.

  3. #3
    Veteran Member
    Join Date
    Sep 2007
    Posts
    1,778
    Location
    Doniphan, Mo.
    Tractor
    Kubota L4240, B7800 & BX2660

    Default Re: Gas engine racing during idle.

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

  4. #4
    Super Star Member
    Join Date
    Jul 2011
    Posts
    14,431
    Location
    Yanceyville, North Carolina
    Tractor
    Kubota L4400

    Default Re: Gas engine racing during idle.

    Perhaps this will be of some assistance? BTW, Welcome aboard and Best Wishes. What Causes Surging in Car Engines? | eHow.com
    The PUPIL who does not surpass his Master, fails his Master.

  5. #5
    New Member
    Join Date
    Oct 2012
    Posts
    13
    Location
    Andover Connecticut
    Tractor
    IH 2400A backhoe..,NH L865 skid steer, IH 185 LoBoy, Kubota L2250 WalMart Murray 20 hp rider, my workhorse

    Default Re: Gas engine racing during idle.

    Quote Originally Posted by Don87 View Post
    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

  6. #6
    New Member
    Join Date
    Oct 2012
    Posts
    13
    Location
    Andover Connecticut
    Tractor
    IH 2400A backhoe..,NH L865 skid steer, IH 185 LoBoy, Kubota L2250 WalMart Murray 20 hp rider, my workhorse

    Default Re: Gas engine racing during idle.

    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

  7. #7
    Elite Member
    Join Date
    Dec 2003
    Posts
    4,011
    Location
    NC
    Tractor
    Kubota Grand L3830

    Default Re: Gas engine racing during idle.

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

  8. #8
    New Member
    Join Date
    Oct 2012
    Posts
    13
    Location
    Andover Connecticut
    Tractor
    IH 2400A backhoe..,NH L865 skid steer, IH 185 LoBoy, Kubota L2250 WalMart Murray 20 hp rider, my workhorse

    Default Re: Gas engine racing during idle.

    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.

  9. #9
    Veteran Member
    Join Date
    Jan 2009
    Posts
    2,014
    Location
    Carroll, Ohio
    Tractor
    Massey 180 Diesel

    Default Re: Gas engine racing during idle.

    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...

    -c-157-governor-gif

  10. #10
    New Member
    Join Date
    Oct 2012
    Posts
    13
    Location
    Andover Connecticut
    Tractor
    IH 2400A backhoe..,NH L865 skid steer, IH 185 LoBoy, Kubota L2250 WalMart Murray 20 hp rider, my workhorse

    Default Re: Gas engine racing during idle.

    Quote Originally Posted by DJ54 View Post
    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...

    -c-157-governor-gif
    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.

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