| Author | Message | ||
     Kevin Coughlin Posted From: 63.17.30.115 |
-------------------------------------------------------------------------------- I have an OC-46 I am working with - has the 4 cylinder gas Hercules IXB-3 motor (I think that is what it is). I've replaced the magneto, and a new carburetor (it came to me without one) from yesterday's tractor. Starts, runs, and for the first 30 seconds or so has good power - pushes dirt, goes up hill, etc. However, the power drops off, and while it still runs briskly with no load, any load bogs it down and kills it. Let it sit for 30 seconds to a minute, and it is good for another 10 seconds of "snort" before it rolls over and goes limp. I would suspect the float in the carb, but I've adjusted it to the point of way too high and that isn't it. It was suggested gasketing on the intake manifold - I tried spraying ether around the gasket to see if it got faster - no luck. When I restart it after it bogs down to nothing it is fuel rich (black smoke) and takes just a bit to come up. What else am I missing? I really want to use this yard art, but I'm getting really tired of the motor. It seems silly to get super frustrated and rip the motor out when I think (I hope?) it might be something simpler.... Any ideas? Oh - I have a temporary fuel tank, feeding it with an electric pump and a pressure regulator from 1.5 to 5 psi, and the gas is brand new. Blew out the carb again with the compressor just to see (there was some crud in the fuel filter earlier). | ||
| Kevin Coughlin Posted From: 63.17.3.73 |
Just a follow up. Changed gaskets on the intake/exhaust manifold, took the head off and verified the gasket is good and the valves move correctly, seats look good (I think this was something that was worked on a lot but not used much - possibly due to this mysterious problem?). I swapped my old magneto in and it makes no difference. I cleaned the carb so many times... and then bolted a propane carburetor on it just to see..... it does the same thing on propane (runs for a few minutes, gets warm, and lugs down on any kind of load and dies, being very hard to start for several minutes). My last guess it possibly the intake/exhaust manifold is the problem - it is the first to heat up, first to cool down, and if there were cracks in it that might make sense. I'm long past out of patience with this - and this weekend I'm looking at finding a replacement motor - my thought is that a 4 cylinder car motor from a rear wheel drive car AND the complete clutch/transmission could be dropped in, and all I have to fabricate is something to tie the output of the new tranny to the input of the old tranny - giving me a way to cut the rpm of the car motor and REALLY giving me a low low low speed with a lot of torque for dirt pushing. If I do that, I hope to recover the expense by selling my new (one hour of use) XH1113 magneto, the new (2 hours use) zenith carb, the original kind of chewed but running magneto, and the motor from the radiator back to the u-joints. I'll keep you posted unless I miraculously find the fix for the motor in the next day or two. Seems a pity - the motor has 105-110 psi compression on all 4, and when it is cold and you dig into the dirt too deep it will spin a track.... but after 2 minutes it goes belly up. Argh! |
