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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

deisel in oil JD350

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tracyC

06-27-2007 10:18:48




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Well I thought I had this problem licked when I had the injection pump rebuilt but that does not seem to be the case. The fuel pump looked ok when I inspected it but I'll go ahead and replace that too. Any other ideas,thoughts?

thanks in advance, tracy




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tracyC

06-28-2007 10:39:30




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 Re: deisel in oil JD350 in reply to tracyC, 06-27-2007 10:18:48  
Thanks for the info., the problem was there before the pump came out. And it was installed by trained mechanic. I assume the seals that keep fuel out of the crankcase were replaced when the pump was rebuilt....dont they come out with the pump, on the pump? Any other ideas?

thanks again, tracy



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jdemaris

06-28-2007 12:59:38




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 Re: deisel in oil JD350 in reply to tracyC, 06-28-2007 10:39:30  
The seals are on the pump driveshaft that stays on the engine - they are not part of the injection pump. It is very easy to flip one over without realizing it - and I've seen many experienced mechanics do it - including me. To my defense, I had to install many out in the woods at temperatures near zero - so I sometimes got in a hurry and could barely feel my own fingers. One faces away from the pump and one faces towards it. The one facing the pump wants to flip over, and when it happens you cannot feel it as the pump is slid on. You always have to check after an installation for diesel leakage. With your 152 c.i. engine, there are only two places such a leak can happen - your fuel pump or the injection-pump driveshaft. In regard to the leak being there before the pump rebuild? That doesn't rule anything out. Perhaps the old pump had a worn drive bushing (where the two seals ride). You got it rebuilt, but it was never installed correctly. That's all it would take. In regard to suspecting the fuel transfer pump? It's easy to remove and cheap to replace - i.e. should't be an issue.

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tracyC

06-28-2007 14:05:57




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 Re: deisel in oil JD350 in reply to jdemaris, 06-28-2007 12:59:38  
Thanks, sounds like i need to take the pump out and replace the seals properly. I Hope the pump isnt any worse for wear. I live out in Big Sur, CA and was able to trade treework for this tractor I use to maintain our road that switchbacks 4 times up a steep 700'cliff face of erroding dirt and granite. Fortunately, where I live it never gets below freezing.....my fingers hurt just thinking about it.

Thanks again, Tracy

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KyFivePts

06-28-2007 05:31:06




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 Re: deisel in oil JD350 in reply to tracyC, 06-27-2007 10:18:48  

I had the very problem that jd described with my450c.During the installation of an injection pump a seal was cut allowing the crankcase to be flooded with fuel.



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jdemaris

06-27-2007 14:01:37




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 Re: deisel in oil JD350 in reply to tracyC, 06-27-2007 10:18:48  
Getting the injection pump rebuilt has little to do with stopping it from leaking diesel fuel into the crankcase. It's all up to the person installing the pump, and it is very easy to screw up the new seals when slipping the pump over them - rebuilt OR used. The seals that do the sealing are not part of the pump.



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