Is your coolant level going down? Could be a head gasket or sleeves.
Model 870 Diesel in Crankcase
I have a JD 870 that I purchased about 1990 that has around 550 hours on it. When I changed the oil last fall I noticed that the level was higher than normal and the drained oil seemed quite thin. Since the oil change I've used it for another 10 to 20 hours and I noticed that the oil level is again rising.
I'm pretty sure that diesel in leaking into the crankcase somewhere. I suspect that the culprit might be a bad seal on the injection pump but I'd like to avoid pulling it and sending it out for service if the problem is actually elsewhere. I'd like to hear from others that have had the same issue on this model as to what the issue was. Also, if anyone has some suggestions for things to check that would be great, too.
I'm pretty sure that diesel in leaking into the crankcase somewhere. I suspect that the culprit might be a bad seal on the injection pump but I'd like to avoid pulling it and sending it out for service if the problem is actually elsewhere. I'd like to hear from others that have had the same issue on this model as to what the issue was. Also, if anyone has some suggestions for things to check that would be great, too.
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The coolant level is fine. Also, there are no milky deposits in the crankcase that would indicate coolant leakage. Further, the oil smells of diesel so I'm all but certain that diesel infiltration is the issue, I just don't know yet where it's coming from. I suppose that it could be a leaking/dripping injector but I haven't seen other symptoms of that.
I would absolutely suspect a leaking injection pump, that's the only way I could imagine diesel leaking into the engine. I would be very nervous about a possible hydro-locked piston and bent rod occurring if this is happening and the fuel doesn't drain out of a cylinder.
The other possibility, but I don't quite know how they work, if it has the "thermostart" like my 1050, they drip a tiny amount of fuel into the intake manifold onto a heating element to heat the intake for cold starts (works when you hold the key to the left). IF the 870 had the Thermostart?
The other possibility, but I don't quite know how they work, if it has the "thermostart" like my 1050, they drip a tiny amount of fuel into the intake manifold onto a heating element to heat the intake for cold starts (works when you hold the key to the left). IF the 870 had the Thermostart?
Does that tractor have a mechanical transfer fuel pump? My 4720 does and they are known to leak fuel into the crankcase if their seal fails.I have a JD 870 that I purchased about 1990 that has around 550 hours on it. When I changed the oil last fall I noticed that the level was higher than normal and the drained oil seemed quite thin. Since the oil change I've used it for another 10 to 20 hours and I noticed that the oil level is again rising.
I'm pretty sure that diesel in leaking into the crankcase somewhere. I suspect that the culprit might be a bad seal on the injection pump but I'd like to avoid pulling it and sending it out for service if the problem is actually elsewhere. I'd like to hear from others that have had the same issue on this model as to what the issue was. Also, if anyone has some suggestions for things to check that would be great, too.
1 - 6 of 6 Posts
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