ponytug
Super Member
Just to clarify; Yanmars use a thermostart (with an R) to preheat the air intake. I think that is what @jaxs was referring to. (Autocorrect can be a pain sometimes...) The link that @jaxs posted will explain it in detail. Are you following the manual on how to start the engine? Yanmars have a specific routine.Thanks for all the replies. My thermostat is working and was just replaced by the previous owner. I haven’t done any compression test so I don’t know for sure that it has perfect compression but when I was taking the injector out I turned the engine over to push it out and it just about shot out of the head so I assumed compression wasn’t an issue. But I will still do a real compression test to make sure it’s good. Also since I’ve had engines with very low compression I know that even with low compression an engine will still at least fire a small amount and I haven’t even gotten that out of the tractor. As for the smoke out of the exhaust I would say it’s a little on the grey side rather than white but I guess it still could be vapor. I check the radiator and I don’t see any oil in the coolant and it looks pretty clean. Could valves be an issue?
White smoke is cold, unburnt diesel (bad injector, blown rings or head gasket), or a coolant leak into the cylinders. The fact it won't light off on any cylinder makes me suspect either it's cold (no thermostart in use), or something worse like a head gasket, as none of the cylinders are catching.
All the best,
Peter