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Strange 986 problem


 
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36 A
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Joined: 09 Dec 2001
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PostPosted: Sat May 12, 2018 12:38 pm    Post subject: Strange 986 problem Reply to specific post Reply with quote

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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SuperAV Jr B
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PostPosted: Sat May 12, 2018 6:41 pm    Post subject: Re: Strange 986 problem Reply to specific post Reply with quote

I?m my opinion I don?t 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 don?t see anything wrong thag u can see by eye do a pressure test for the coolant system. It?ll build up pressure and the leak will show.
 
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IHTimmy
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PostPosted: Sat May 12, 2018 9:33 pm    Post subject: Re: Strange 986 problem Reply to specific post Reply with quote

It sounds like you scored a piston and crack the liner at top oring caused by cam lobe
 
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caterpillar guy
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PostPosted: Sun May 13, 2018 7:43 am    Post subject: Re: Strange 986 problem Reply to specific post Reply with quote

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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