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  1. #1
    New Member
    Join Date
    May 2012
    Posts
    13
    Location
    Harris, MO.
    Tractor
    NH TL80

    Default Bobcat with Ford Pinto engine

    My buddy, who is not too mechanically inclined, has a Bobcat with a 4 Cyl Ford motor and since we help each other and I have access to the Bobcat I try to help him with it. He was complaining that the machine was missing and running erratically at full throttle. Another guy put a new Zenith carb on it and it was a relatively new fuel pump. I told him I'd look at it and he said he had cleaned the fuel tank and put a new filter on it. He also asked me to hook up a choke cable which I did. It starts very easily and runs smooth to a certain point but when it's put under load it acts like it misses and runs rough. I noticed that there is no vacuum hose attached to the advance diaphram on the distributor and I can't find a place to attach one on the intake manifold. There is a place on the top of the intake manifold that is capped off but it does not look like a normal vacuum tube as found on older V8's The shop manual shows one for timing setting. With a normal gasoline engine (and this one has points) it should have the vacuum line and it should work to advance the spark.

    Now, since this is a Bobcat ( and a sick one at that) do they just not run a vacuum advance or has someone hacked this machine. I know he bought it used several years ago. ????? Any help would be appreciated.

  2. #2
    Platinum Member Sutol's Avatar
    Join Date
    Dec 2011
    Posts
    636
    Location
    Cheshire England UK
    Tractor
    Ford 1200 / Super Dexta x 2

    Default Re: Bobcat with Ford Pinto engine

    Quote Originally Posted by roofgunner View Post
    My buddy, who is not too mechanically inclined, has a Bobcat with a 4 Cyl Ford motor and since we help each other and I have access to the Bobcat I try to help him with it. He was complaining that the machine was missing and running erratically at full throttle. Another guy put a new Zenith carb on it and it was a relatively new fuel pump. I told him I'd look at it and he said he had cleaned the fuel tank and put a new filter on it. He also asked me to hook up a choke cable which I did. It starts very easily and runs smooth to a certain point but when it's put under load it acts like it misses and runs rough. I noticed that there is no vacuum hose attached to the advance diaphram on the distributor and I can't find a place to attach one on the intake manifold. There is a place on the top of the intake manifold that is capped off but it does not look like a normal vacuum tube as found on older V8's The shop manual shows one for timing setting. With a normal gasoline engine (and this one has points) it should have the vacuum line and it should work to advance the spark.

    Now, since this is a Bobcat ( and a sick one at that) do they just not run a vacuum advance or has someone hacked this machine. I know he bought it used several years ago. ????? Any help would be appreciated.
    If it has a diaphram on the distributor then it needs the pipe.
    If not it could be the condenser breaking down that is causing the rough running, shows up under load, no missing etc on light throttle when condenser going just under load.
    Extreme case the engine will backfire under heavy throttle application.
    .
    .
    .Pete

    .
    .

  3. #3
    Elite Member
    Join Date
    Jul 2009
    Posts
    4,565
    Location
    SW WA
    Tractor
    Kubota BX2360

    Default Re: Bobcat with Ford Pinto engine

    Might be this one, or you may find it on this site:

    fordopedia.org: Pinto OHC engines: B7.40 - Distributor (BOSCH)

    Bruce

  4. #4
    Veteran Member
    Join Date
    Nov 2003
    Posts
    1,334
    Location
    Tombstone Az
    Tractor
    KIOTI LK30

    Default Re: Bobcat with Ford Pinto engine

    I bet that the carb that was replaced had a vacume port on it.

  5. #5
    New Member
    Join Date
    May 2012
    Posts
    13
    Location
    Harris, MO.
    Tractor
    NH TL80

    Default Re: Bobcat with Ford Pinto engine

    It at one time it had to have a port for the distributor and I agree about the condenser. If the spark isn't advancing then the engine is being dogged out. Probably I should instal new points, condenser, cap and rotor. thanks

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