7520 runs on

[bindian]

Oil getting into the intake tract ... probably via the turbo seal...? Is the air filter clean?
larry

..........................that would put out a lot of black smoke when running. He said the smokong issue was resolved
hugs, Brandi

 

[SPYDERLK]

Larry,
Are you suggesting that the engine is running on engine lubrication oil that is leaking into the intake? If this is a possibility I would like to learn more about it, and if this is what is happening I would think that his oil level would be dropping.

Brandi,
I have seen this happen before and I have used a Qtip to reach down into the injector pump, when the solonoid is removed, to clean trash from the surface of the seat.

My thots would be like this;
1] Maybe a dirty air filter causing a little more vacuum
2] When under power the vacuum is localized on the air filter end -- downstream of the turbo is boosted - perhaps no leak at this time?
3] When the turbo idles down it gets ineffective and the whole intake tract sees some vacuum
4] A little bit of oil pulls thru the turbo seals [maybe only at this time] allowing the engine to continue running barely
5] Number 3 could also suggest looking at the intake valve guide seals, altho Id expect this to be varied a lot between cylinders and cause a rough run on - more like mine below.

I agree that the oil level would drop, but it would be very slow if the leak were very small or significantly present only at idle. Who knows:confused2:. but this seems to fit the symptom and history. - - My 7520 will sometimes not cut off clean, chugging a few times before stopping. Im pre alarmed.
larry

 

[flatrockfarm]

Thanks for the ideas.

The tractor is at the dealer now, I'll post any developments/repairs. Hopefully we will make some discoveries soon. Tractor season is fast approaching.

 

[SPYDERLK]

Any news on the run on problem?
larry