First time posting on this forum. Was looking for some help with a problem on my Ford Jubilee. I have been disking a field to get ready for a fall planting here in NY but the Jubilee is using close to a quart of oil per hour. It seems like most of the oil is being lost through the seals and not burnt. Leaking mostly from the rear main seal and oil pan seal. It only leaks while running which makes me believe I have positive crankcase pressure. So far I have cleaned the crankcase breather and replaced the filter on the air exhaust port located on right rear side of engine valve cover. When engine is running i feel air being expelled from this exhaust port so it doesn't seem to be restricted there. I suspect maybe that the piston rings could be stuck or worn. I currently have the cylinder soaking in marvel mystery oil to free them up. If that doesn't work I am not sure where to look next short of tearing into the engine. Any ideas would be greatly appreciated.
- Thread starter Jon711
- Start date
You have to remember that is a 60 year old tractor and who know if or when it has ever been rebuilt. I would have used ATF instead of the MMO but I like to get by cheaply and ATF cost half of what MMO does. But you are sort of on track as to what to do to it. I would also run some ATF in the gas say 1qt to 5 gal and that will help clean out carbon in and around the valve and guides
If it sat that long good chance the rings are stuck to the pistons so a good soaking of ATF for a few days will help a lot. I fill the cylinder when I do that and if it has a vertical exhaust I pour ATF down the exhaust to make sure the valves also get a good soaking to make sure they are nice and free
Yes I do mean the oil pan gasket. However it is also leaking past rear main seal and a few other places but only while its running. That is why I suspected blowby the piston rings because of the amount of places it leaks and the fact that it only leaks while running. The engine only smoked some out of the crankcase breather but only after it really warmed up and the oil was low, at that point I shut it down.
showcrop
Well-known Member
You are supposed to have crankcase pressure, that is why they are vented. A worn motor will have more. normally there are few places that will leak when the engine is not running. Your description of the amount of venting does not make it sound like you have stuck rings. You need to try to weigh time and parts to fix various leaks against how bad the leaks are. Renewing the pan gasket is peanuts in both time and money compared to everything else.
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