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D6 9U oil leak


 
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1349
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Joined: 24 Dec 2009
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PostPosted: Wed Jun 06, 2018 6:11 pm    Post subject: D6 9U oil leak Reply to specific post Reply with quote

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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Old Magnet
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PostPosted: Wed Jun 06, 2018 6:48 pm    Post subject: Re: D6 9U oil leak Reply to specific post Reply with quote

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
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Joined: 12 Oct 2007
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Location: Ottumwa, Iowa

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PostPosted: Thu Jun 14, 2018 12:10 pm    Post subject: Re: D6 9U oil leak Reply to specific post Reply with quote

What does it use for an engine breather? Could crankcase pressure be forcing oil out the rear main?
 
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dpendzic
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Joined: 05 Mar 2009
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Location: long island NY and Hancock Ma

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PostPosted: Thu Jun 14, 2018 4:20 pm    Post subject: Re: D6 9U oil leak Reply to specific post Reply with quote

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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AJ.
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PostPosted: Fri Jun 15, 2018 2:43 pm    Post subject: Re: D6 9U oil leak Reply to specific post Reply with quote

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.
AJ
 
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