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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

D6 9U oil leak

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Author  [Modern View]

06-06-2018 19:11:22

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Two questions I suppose. I have a 9U wet clutch that loses a lot of oil while running, run it all day, gallons of oil. This oil is finding its way to the clutch where it loses it and blows it out while running.
I assume this is the engine rear main seal gone?

What is most efficient way to fix? Pull trans?
any other advice APPRECIATED.

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06-15-2018 15:43:37

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 Re: D6 9U oil leak in reply to 1349, 06-06-2018 19:11:22  
Yes a blocked breather could cause the oil to leak and as OM said worn mains,the most likely cause is that the oil throwing grooves on the crank are clogged up with carbon,as the carbon builds up the throw is not as good as it needs to be and the oil will leak.


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Old Magnet

06-06-2018 19:48:21

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 Re: D6 9U oil leak in reply to 1349, 06-06-2018 19:11:22  
The D318 engine in the 9U does not have a rear main seal. It depends on a reverse thread part of the rear journal to pull oil back into the engine. Severe main bearing wear opens up the clearances that lead to that problem.

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Roger in Iowa

06-14-2018 13:10:28

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 Re: D6 9U oil leak in reply to Old Magnet, 06-06-2018 19:48:21  
What does it use for an engine breather? Could crankcase pressure be forcing oil out the rear main?

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06-14-2018 17:20:11

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 Re: D6 9U oil leak in reply to Roger in Iowa, 06-14-2018 13:10:28  
It has a typical Cat breather on the right side of the engine near the oil fill tube. It has the air holes on the bottom so yes--they may be plugged from old oil vapors--they are a maintenance item should be cleaned periodically

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