Fuel in the engine oil

Don McCullough · Oct 18, 2009

Have an old 5020 John Deere I found (after I bought it, of course) it had fuel in the oil. Had oil analyzed and amount of fuel in oil above their ability to read.

Changed oil and after very little running time noticed the oil level rising on dip stick.

Looks like have to replace injection pump. Replaced transfer/supply pump and did not help.
11-12 hundred bucks for rebuilt pump--installed.
Wow !

Question: Has the engine been harmed by former owner? Drop the oil pan and measure the bearing surfaces only way to know or is there an easier way?

Seems to run fine and have good power.

Former owner pulled the dip stick and I said: "The oil seems thin." Live and learn !!

Old Roy · Oct 18, 2009

Sounds like cracked rings,or possibly a piston
not enough compression to fire the fuel.

Does engine seem to falter or miss?

twopop · Oct 18, 2009

I think you have a roosamaster pump.if so the the umbrella seal on the shaft are probably leaking.they are cheap and fairly easy to replace.

ben brown · Oct 18, 2009

i say twopop has this call right i think list time i got couple them seals was like 4 bucks a peace. o-ring 10.00 dollars in parts and hrs work

dej(Jed) · Oct 18, 2009

Fuel dilution occurs in every engine. The first time you start the engine after an oil change, the dilution begins. Ring wear of course speeds it up, but by and large it takes a long term run and an excessive amount of dilution to do bearing damage.

www.FuelsandLubestechnologies.org

DickL · Oct 18, 2009

I have a 961 Dorf with a roosamaster pump that has to have the shaft seals changed every couple of years. It does not get run much and seem to get hard from setting. It calls to pack them with grease and I always did but the last time I not only packed both cup seals I packed both sides and inbetween. I think it has helped. I did not use it all summer though.

Don McCullough · Oct 18, 2009

Old Roy and all you other guys. Thanks much for your response. Maybe this fuel in the engine will not cost me an arm and a leg after all!

Old Roy. I'm doubting cracked rings, or piston since it runs fine. An example is I can make a U-turn idled all the way down in the highest gear without a stutter. Also pulled out a pretty big stump with it. Too, accelerates fine.

I've had gas tractors in the past and this diesel sure is sensitive to cold weather when it comes to starting. A tiny bit of starting fluid and all is well.

I'm think'in--from what some of you tell me--there's still quite a bit of life in this engine even though it's been run with fuel in the oil.

Don McCullough · Oct 18, 2009

ben brown.

Ben. Do you own a 5020 John Deere? I take it you do from your response to my injection pump question. You replaced these parts (seals and 0-ring) you mention yourself on a 5020?

Trying to decide if I have the know-how or ability to do it right. I have both a shop and owners manual for my 5020.

ben brown · Oct 19, 2009

no i dont have a 5020, but i do repair a lot farm equipment,, that type pump was use on a whole lot of different tractors so have replaced a lot thoes seals. i remove injuction lines from pump and injuctors any other line going to pump. it not nessary but a good idea if its firts time to put engine in time remove the little side plate, and line up pump timming marks. the drive shaft with seals well stay with pump. replace the seals two unbrella style seals.one faces towars front one towars back of tractor,, the first one in is a littel trickie to get it to slide into pump once you get it worked in slide the pump back anf forth making sure that seal is not folded back or it well leak the o-ring is on end of pump.

twopop · Oct 19, 2009

it certainly would be a good idea to pull the pan and check the rod and main bearings.they should be changed at every 5000 hrs and you prolly dont know how long the fuel has been diluted.

trucker40 · Oct 19, 2009

You probably want to check the bearings.If its been run with diluted oil and the bearings are worn out you could have problems if you go to using it hard.New seals and check the bearings and it should be alright.

Brian Jasper co. Ia · Oct 19, 2009

Don, the seals for the pump shaft are about $2 ea. Pull the pump and slide the shaft out. It will be obvious if one of the seals were rolled over. Also look in the bore the shaft rides in. It is a bronze bushing and over time the seals will wear grooves in the bushing. If the bushing is worn, you will want to have the pump rebuilt.
I have a D17 Allis with a diesel in it. When I got it it was very cold and we couldn't get it started. The oil looked clean and it was obvious the engine had been apart. I was driving it on the road when it started to labor real bad and I saw LOTS of blow by coming from the breather cap. I shut it down immediately and that's when I figured out why the oil was so clean. It was mostly fuel. I fixed the pump seals, flushed the fuel out of the oil, put in a new filter and filled it up with new oil. It's been fine since.

Fuel in the engine oil

Don McCullough

Member

Old Roy

Well-known Member

twopop

Well-known Member

ben brown

Member

dej(Jed)

Well-known Member

DickL

Well-known Member

Don McCullough

Member

Don McCullough

Member

ben brown

Member

twopop

Well-known Member

trucker40

Well-known Member

Brian Jasper co. Ia

Well-known Member

Similar threads