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Strange 986 problem

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36 A

05-12-2018 13:38:01

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A guy was using his 986 lightly disking and heard a pop sound and the tractor quit in its tracks . Dead ! Turned the key it started right up ran fine and finished the field . Parked it by the shed for a few days and he was going to run it so he checked the oil it's WAY over full 2" or more on the dip stick . Antifreeze in the oil !! My question is what happened to kill the motor and leak coolant in the crank case ? Tractor has 9000 hours .

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caterpillar guy

05-13-2018 08:43:38

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 Re: Strange 986 problem in reply to 36 A, 05-12-2018 13:38:01  
Are you sure it is coolant? It could just as easily be Fuel from a pump seal. Need to check coolant first,for level. if it had 2 inches extra coolant the oil would look milky or drain from the oil pan by loosening the drain plug. Radiator would look low. That wold also sound more like the reason for the stall and restarting.

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05-12-2018 22:33:32

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 Re: Strange 986 problem in reply to 36 A, 05-12-2018 13:38:01  
It sounds like you scored a piston and crack the liner at top oring caused by cam lobe

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SuperAV Jr B

05-12-2018 19:41:44

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 Re: Strange 986 problem in reply to 36 A, 05-12-2018 13:38:01  
Iím my opinion I donít know what the pop was but what u need to do is take the oil pan down and look up into the bottom of the engine. If u donít see anything wrong thag u can see by eye do a pressure test for the coolant system. Itíll build up pressure and the leak will show.

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