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Subject: Need Help on Ford 172/192 CI Industrial

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Jon Rhee (RI)    Posted 05-13-2017 at 16:42:45 [URL] [DELETE]        [Reply] [Email]  
  • Need Help on Ford 172/192 CI Industrial
  • Hey guys - my spring project is getting my Jacobsen G-10 tractor running after it blew a head gasket last fall. I had it idling one day and all of the sudden it started losing power and running erratically, popping and blowing oil out the exhaust. The #2 and #3 cylinders had 0 psi. I pulled it apart and there was a clear chunk of gasket missing. I took the head to a machine shop and had it compression checked, hand magged and planed. I replaced it and the head gasket obviously. I did not do anything to the valves since they seemed fine. I also had the intake exhaust manifold brazed. I reassembled the engine in the past couple of weeks and made the first attempt to run it today. It started right up however it is running extremely erratically in bouts of power loss then running with puffs of black smoke. It smells very gassy as well - choke is wide open. I checked the compression - I have 155 lbs on all 4 cylinders. I suspect the carburetor since it was sitting all winter and was on my bench for a month while I had the engine stripped down. I took it apart but nothing visible. The float seems to operate the float valve ok. I didn't check it for holes though. I tried bottoming the idle fuel needle and opening it to its initial setting also - no change in performance.

    Does anyone know this engine that might have some suggestions? I'm stumped. Thanks in advance - Jon

    Dean    Posted 05-13-2017 at 17:40:20 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Need Help on Ford 172/192 CI Industrial
  • Try it with the air filter hose removed.

    Not uncommon to find mouse nests in the air filter.

    Also check the fuel. Old gasoline?


    Jon Rhee (RI)    Posted 05-13-2017 at 19:08:23 [URL] [DELETE]        [Reply] [Email]  
  • Re: Need Help on Ford 172/192 CI Industrial
  • Hi Dean -

    Im testing it without the air intake connected to the carb. The fuel is good, and I am using a test bottle to feed it. I was hoping to get it warmed up so I can torque the head down.

    I didnt mess with the distributor, the timing or the valves and when I pulled the rocker arm off and pushrods I labeled them all so theyd go back in the sane spots.

    I'm hoping I'm correct in assuming that because I have veey good even compression that there os nothing catastrophic wrong. Maybe a gasket leak on the intake side?

    Bruce Dorsi    Posted 05-13-2017 at 21:47:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Need Help on Ford 172/192 CI Industrial
  • A vacuum leak should cause a lean misfire, not black smoke or a rich mixture.

    Is the vent for the carb bowl clogged?

    Ignition failing??

    Jon Rhee (RI)    Posted 05-13-2017 at 22:06:55 [URL] [DELETE]        [Reply] [Email]  
  • Re: Need Help on Ford 172/192 CI Industrial
  • Vent hole....possibly. I painted the carb so its possible I plugged it up. Wouldnt that be a lean situation though? I thought about the ignition too but it starts up on half a roll every time. The behaviour does seem like ignition is intermittent.... kind of like someone is turning the key off and on before the engine quits. I will check both of those things Thank you Bruce!

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