Oil & Fuel YM240D Fuel Problem

[Ed Wells]

Earlier this year I wrote in for advice about low compression on my Yanmar 240D after overhauling the engine. After much trial and error, I discovered there was a small crack in the head and I am happy to report that problem has been solved. It seems the previous owner was using ether to start it during cold weather.

I now have discovered problems with diesel fuel leaking into the crankcase. Does anyone have any advice on where this could be coming from? I can tell you it does not have the original fuel filter system on it, but I cannot see how this would affect the leaking problem. It appears to be a good system and there is no connection to the crankcase.

Is there a way the injection pump can be leaking internally?

 

[SailorBob]

I have seen reports of this before. I believe that the problem was a diaphram on the injection pump that will allow fuel to leak into the crankcase. I am pretty sure that this can be easily replaced.

 

[HoyeTractor]

The only place you can get fuel into the oil on that tractor is through the injection pump. The fuel leaks by the little internal pistons. It will need to be rebuilt or replaced

INJECTOR PUMP NEW_: Yanmar Tractor Parts


Aaron
Parts@HoyeTractor.com
(940)592-0181