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UPDATE.............Still leaks

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mhalter

02-28-2008 13:09:27

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Got everything put back together this afternoon. Changed the oil and drove her around for about 30 minutes. Shut it off and let it sit for about 5 minutes. Pulled the dipstick and suprise suprise. It was about two inches overfull and very thin. I'm sure veryone is going to say well you installed the seals wrong. But as you know I was very careful in replacing them and asked alot of questions so as to get it right. So its back to square one. What are other possibilites of fuel in the oil besides faulty seals? Could my injection pump be leaking so bad the seals can't hold it back? I'm no expert but it seems to me there shouldn't even be much fuel make it through the pump anyway? Oh, and as a side note, this engine has 10,300 hours on it. Any ideas?

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Owen Aaland

02-28-2008 16:03:20

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Re: UPDATE.............Still leaks in reply to mhalter, 02-28-2008 13:09:27

There are only two places where you can get fuel into the crankcase on the 806. Either it has to come past the shaft seal or from unburned fuel from the injectors. If you got two additional inches in the crankcase in a half hour of running it is highly unlikely that faulty injectors are the problem. You would surely notice poor starting and excessive smoke if they were that bad. That leaves the shaft seal and pump adapter for the leak.

There is no seal inside the pump. The only seal for the fuel is the rear seal in the adapter housing. The side of the seal with the spring in the lip must face the pump. The front seal is installed with the lip forward and it is there to seal oil from getting into the pump. If the front seal were to be installed backwards it is unlikely that oil would actually leak into the pump since the fuel in the pump is under a slight pressure.

It is possible though unlikely that a porous housing is the cause. A defective housing would usually leak long before this. More likely causes would be a damaged seal, a seal installed backwards, a housing damaged when removing the old seal, or damage to the shaft.

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