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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

D69U Diesel in engine oil

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Bob Martin

04-09-2006 17:53:49




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I have a D69U which I have had for over 20 years and done a load of work with. I've let it sit the last couple of years while I toyed with putting undercarriage parts and other things with it, starting it for short periods of time. Nothing ever showed up. This spring (06) I started to use it and the injection pump had bled down, but it started ok after bleeding the air out of all the lines with the pony turning it over. This happened a couple more times.

I checked the oil which has thinned out and shows over full, which leads me to believe there is a fair amount of diesel in the oil.

Question: Would this have happened during starting/ line bleeding process while the cylinders wouldn't have been firing or is there something connected with the pump bleeding down while sitting that would have allowed the diesel to get into the crankcase in a fair amount?

appreciate the help

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Bob Plumadore

04-12-2006 00:45:58




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 Re: D69U Diesel in engine oil in reply to Bob Martin, 04-09-2006 17:53:49  
I would suspect the seals on the fuel transfer pump. they are not difficult to replace and no special timing is required to remove & reinstall the pump.
it is a double seal you have to be careful or you will put them in backwards.



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Eric Rylander

04-09-2006 19:17:23




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 Re: D69U Diesel in engine oil in reply to Bob Martin, 04-09-2006 17:53:49  
1. Get a sample kit from the Cat dealer and take an oil sample after it"s warm
2. Change the oil. You need to anyway. Leaving it sit and only starting it for short periods of time over two years is very bad- condensation builds up and never burns off as the engine does not warm up all the way. Change the oil once a year at least!
3. If you suspect the seal, put a reman lift pump on it. Don"t be a cheapskate and try a bunch of snake oil crap remedies.

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Bison

04-09-2006 18:11:23




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 Re: D69U Diesel in engine oil in reply to Bob Martin, 04-09-2006 17:53:49  
your most likely cause is the liftpump leaking past the drive shaft into the engine, that is if you have a mecanical driven one.



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Bob Martin

04-09-2006 18:18:01




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 Re: D69U Diesel in engine oil in reply to Bison, 04-09-2006 18:11:23  
Bison:

Given that is the problem, how hard is that to fix? Would it be fixed with a new seal or is there a possiblity of using a seal conditioner in the diesel.

thanks a bunch



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Bob/Ont

04-09-2006 18:35:50




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 Re: D69U Diesel in engine oil in reply to Bob Martin, 04-09-2006 18:18:01  
Bob, first thing I think you should get an Oil Sample checked, Cat dealer can do this for a few $ and go from there. The fuel injection pump has it's own oil supply on your engine. It may be antifreeze. Find out and come on back. Later Bob



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