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Kubota oil leak

July 10, 2011, 12:15:03 pm

I have a 10k powertech.
I have discovered an oil leak on inside half of the engine. Cannot find source.
Small but annoying.

Any suggestion will help

Bill

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Re: Kubota oil leak

Reply #1 – July 10, 2011, 12:33:55 pm

Bill, Hard to narrow it down from your info, however normal leaking areas could be seals on crankshaft, valve covers, fuel pump area, would doubt it would be a sand pit hole and could be head gasket, oil filter not fully seated, loose oil drain plug, loose dip stick in the tube.  Heck there are various areas, I would use a solvent, remove and dry all areas, then startup and run until you see oil sign, stop and find it.
Simple, huh !!
Good luck

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Re: Kubota oil leak

Reply #2 – July 11, 2011, 12:25:47 pm

Hey Bill,

Assuming you mean the inside half of the engine you can't get to when you open the compartment door. Dave pretty much gets to all the possibilities. Only thing that might be hard is checking for source after being blown back by the fan. As I remember, you don't have many hours on the engine. When you have the generator slide pulled out, check for exhaust routing and leaks. I had to re-arrange mine a little. Any vibration in the coach is either a bad mount or exhaust rubbing on something.

I have had l leak from the little shut off valve up by the injector pump. Leaked diesel directly down onto the engine mount and made a mess. I only looked at yours for a second but don't remember seeing any shut off valve on yours but this is on the outside where you would notice it straight away. 

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Re: Kubota oil leak

Reply #3 – July 11, 2011, 08:06:57 pm

Don't forget to check the oil pressure sensor.  You might have to remove it and put new sealant on the threads.

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Re: Kubota oil leak

Reply #4 – July 11, 2011, 10:23:42 pm

Bill
Try Checking the crankcase breather hose and see if it is dripping .

I had a similar problem on the hidden side of the engine and added a longer hose and ran it out like the radiator over flow hose .

Bob H

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Re: Kubota oil leak

Reply #5 – August 27, 2011, 05:36:21 am

Problems solved !
Oil Pressure Sw. is impossible to see.
I pulled the unit all the way out on the slide. Placed wooden slats to hold wide open.
Placed a 12 X 14 " mirror on far wall. Illuminated with drop light.
Still could not see where oil was coming from.
Call Power Tech. Technician said possable cracked oil sw. boss.
I found a Kubota Industrial dealer in Grand Prairie Texas about 1/2 mile from my home.
Shop foreman said he had never heard of an oil pressure boss cracking. He suggested the I remove the oil pressure sw and test it. What I found was that the pressure sw had a pin hole in the diaphragm.
$30.00 later I am fixed. $30.00 and a lot of working blind to remove & reinstall the sw. The sw has a 1" hex head and wiring (3 each) attached with common screws that cannot be seen.
I cut the wires to keep them from winding up when I removed the sw. While the sw was out I attached 6" wires (3 each ) and used a Molex 3 pin connector to reinstall.
No room for a socket (1") had to us a 12" box/open end wrench. Also no way to torque it properly so I used teflon tape on the threads. (May have to tighten it more later.)

I ran it for 1 hour, no leaks.

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Re: Kubota oil leak

Reply #6 – August 27, 2011, 08:56:53 am

Bill, By doing this job yourself you have deprived some poorly trained tech of a learning experience that he could have charged 100 bucks an hour for.  You should pat yourself on the back and retire to the Lazyboy with a suitable beverage.  Good Job. 
Gary B

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Re: Kubota oil leak

Reply #7 – August 27, 2011, 09:31:43 am

Great job!

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