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Re: seized engine?????
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Posted by Don Wadge on February 05, 2005 at 05:22:20 from (142.161.31.240):
In Reply to: seized engine????? posted by vabill on February 04, 2005 at 20:51:16:
Grey oil is an indication of the engine having run with water or coolant (anti-freeze) in the oil. However, probably the most common cause of your symptoms is a jammed starter. If it is only a jammed starter it can usually be relieved by putting the tractor in high gear and rocking the tractor back and forth. If this does not unjam the starter the next step would be to remove the starter and try to turn the engine by prying on the teeth of the ring gear. This should not take a lot of force and should be accomplished with a stout screwdriver. If you cannot then turn the engine it is an indication that the engine is seized. Now back to the grey oil. As I said, grey oil is an indication of water or coolant in the oil. Water in the oil is not good for an engine and if there is enough of it will take out bearings. If it is anti-freeze in the oil it is worse and will take out the bearings much quicker. Water and particlarly anti-freeze will not stick to the bearing surface and will prevent the oil also from sticking to the bearing surface hence a lack of lubrication and the bearings become tight (too brief and explanation but you have the idea). I think if it is seized due to this situation you would have noticed the engine labouring (running like it had a load) in the minute or two before it stopped. In any case you need to get that old grey oil out of there and replace it with new before you try to run it again. I say you go about this in the order I have suggested because the starter situation is the easiest to check out first. I would suggest that if you get the engine running again that you then drain out about half of the new oil and replace that half with diesel fuel and run the engine a few minutes to flush it of all the crud that has developed from the grey oil. Then drain the oil and diesel mixture and replace again with new oil. You should then check your oil frequently for the next while to make sure it does not go grey again. If it does, there is probably coolant getting into the oil and that needs to be fixed.
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