4320 John Deere

richardhh · May 16, 2014

I have a 1979 model 4320 john Deere and just stared it up for the first time this year and noticed that the oil was full of diesel. could this be an injector problem? what should I check first?

Bob · May 16, 2014

First suspect would be fuel lift pump, followed by fuel injection pump shaft seals.

David G · May 16, 2014

I would agree with Bob.

garret geisler · May 16, 2014

Common problem, if not the lift pump there is a seal on the back of the injector pump I believe it can be put in without teardown of the pump,not sure.

Tx Jim · May 16, 2014

(quoted from post at 11:24:46 05/16/14) I have a 1979 model 4320 john Deere and just stared it up for the first time this year and noticed that the oil was full of diesel. could this be an injector problem? what should I check first?

Your tractor if a '79 model must be a 4230 not a 4320 but the remedy for fuel in engine oil is the same

Mike Aylward · May 16, 2014

Jim, as you probably know a 1979 model Waterloo tractor would be a 40 series, not a 30. Likely his date is wrong. Mike

Tx Jim · May 16, 2014

(quoted from post at 13:40:31 05/16/14) Jim, as you probably know a 1979 model Waterloo tractor would be a 40 series, not a 30. Likely his date is wrong. Mike

Mike
Thanks for correcting my mistake. Danged OLDTIMER'S, what was I thinking?????????

Mike Aylward · May 16, 2014

Preaching to the choir, Jim...

Mike

John A. · May 16, 2014

richardhh, I will bet it is the (fuel pump) on the side of the block. A neighbor of mine has had the same problem with his 3020 when it sets for an extended period of time. The fuel pump just starts weeping Dsl through the seal into the engine oil! It is the most likely place it came from.
**
If the fuel in the tank is Higher that the fuel pump, Dsl will leak Dsl into the oil. If it is Lower that the pump, Dsl will not leak through!!!
**
Also look under the tank where the fuel line stub's into the tank there should be a Cut-Off Valve there, close the valve and it solves the problem when the tractor has to sit for an extended period of time! Hope this helps.
Later,
John A.
Hope this helps.

Anonymous-0 · May 22, 2014

Bob is exactly right. I've rebuilt A LOT of them injection pumps and that's what happens. Most likely it's the transfer pump but it's possibly the shaft seals on the injection pump. There are no seals in the back of the pump that could cause this issue, but Garrett was correct that the pump doesn't have to be disassembled to replace the seals.

4320 John Deere

richardhh

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Bob

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David G

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garret geisler

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Tx Jim

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Mike Aylward

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Tx Jim

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Mike Aylward

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John A.

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