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  1. #1
    Platinum Member
    Join Date
    Mar 2002
    Posts
    572
    Location
    Jackson County, Michigan
    Tractor
    Bolens HT-20

    Default IHC info help...

    I have a machine with an IHC 4 cylinder engine model C-135.
    I managed to find the tune-up parts for it, but am having a difficult time getting info for carb adjustment and other tune-up specs. Any suggestions?

  2. #2

    Join Date
    Jun 2002
    Posts
    232
    Location
    NE Texas
    Tractor
    Kubota L35 TLB, John Deere 550 dozer, Cat D-2 dozer, Allis Chalmers HD-11 dozer

    Default Re: IHC info help...

    I don't know the exact specs, perhaps someone has a reference manual and can post them.

    But if you don't get any specific info posted, I think you can use these specs and be pretty close.

    spark plug gap: .028
    point gap: .014
    timing at idle: I would leave timing alone unless you've a good reason to change it. You can time an old engine by ear, but it's kinda tricky. Have to be careful to not advance it too far. I do it by loosening up the distributor, advancing it until the engine starts to lope, then retarding it until the exhaust sound gets kinda throaty, and then find the happy mediun that's closer to the throaty sound then to the loping.

    I suspect the spec would be around 5-10 deg btdc at idle, but don't hold me to it. Often an old engine with a good amount of carbon build up runs better at something other then the spec. anyway. Definitely do not advance it to the point where it gets hard to start or pings under load when hot.

    Idle mixture adjustment: 1/2-1 turn out from lean drop. Lean drop is that point in the adjustment when the idle speed just starts to drop while turning the idle adjustment screw in. To find it, start by turning out a turn and noting the idle speed. If it increases, continue turning out until there is no increase. Then turn in, the idle will increase slightly and then drop off. This is lean drop. Turn out between 1/2 to 1 turn, to where it sounds best.

    Order of adjustment: point gap, then timing, then the
    mixture. Final adjustment of timing, if needed, after mixture.

    HTH,
    Dave

  3. #3
    Silver Member
    Join Date
    Jan 2002
    Posts
    221
    Location
    S.E. Michigan
    Tractor
    BX22, 1949 Farmall Cub, 1966 International Cub

    Default Re: IHC info help...

    mrcaptainbob - Did you try asking at these sites? http://www.atis.net/Bulletin_boards.shtml Chuck

  4. #4
    Platinum Member
    Join Date
    Mar 2002
    Posts
    572
    Location
    Jackson County, Michigan
    Tractor
    Bolens HT-20

    Default Re: IHC info help...

    Thanks for the suggestions, Karmakanic. I did manage to find all the tune up parts a few weeks ago and set everything to what is usually 'normal' (as you suggested). I wish it had the carb adjustments like you describe. Since it's propane fed, however, the 'carb' is a bit different. It appears to have two butterflies: one for air, one for the propane. Although they are connected to each other, the connection is adjustable. It's that adjustment that I'm trying to find out, (along with the timing). It looks as if one butterfly opens at a greater rate than the other. I'm still diggin' for info. Thanks for the suggestions.....

  5. #5
    Platinum Member
    Join Date
    Mar 2002
    Posts
    572
    Location
    Jackson County, Michigan
    Tractor
    Bolens HT-20

    Default Re: IHC info help...

    Thanks, Worksmart, for those two sites. I'll be checkin' 'em out tonight.

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