GM 2-53 slobber

JD440ICD2006 · Post by **JD440ICD2006** » Fri Nov 10, 2006 6:01 am

My GM 2-53 is slobbering a little. I runs down the sides of the exhaust pipe and on to the block. I am sure it has done it since I had it, but I had the hood off and noticed it.
Is this normal? Could it be because it sat up for awhile? I ran it for about 45 minutes yesterday and that is when I noticed the new black "slobber". It starts great, never skips, does not smoke much now unless under load. The air box drain has been cleaned and is blowing properly.
Oil and filter were changed recently and oil looks good for a diesel.
Oil bath has been cleaned and serviced, it gets good air.
Any clues or help is appreciated.

Post by **Lavoy** » Fri Nov 10, 2006 8:47 am

Is your thermostat good so that it is warming up completely? Otherwise I might think about rebuilt injectors.
Lavoy

JD440ICD2006 · Post by **JD440ICD2006** » Fri Nov 10, 2006 9:09 am

Maybe I should sart with a thermostat replacement? Is there an easy way to check it? The temp gauge comes up to around 170-180, but I have never had much confidence in those gauges, they are seldom calibrated close enough to be considered an accurate gauge.
I have not adjusted the injector timing, could that possibly help?

hunter41mag · Post by **hunter41mag** » Fri Nov 10, 2006 10:14 am

Also do not let sit and idle for long periods of time. It does not keep the combustion temperture up for complete burn.
Problem could also be oil seepage into cylinders from blower seals or worn cylinders (rings). If it using oil that you have to add a few quarts everytime you use it I would lean towards an oil problem.

Don
Eastern PA
440IC

JD440ICD2006 · Post by **JD440ICD2006** » Fri Nov 10, 2006 10:24 am

I changed the oil and filter about 6 weeks ago. It has not used enough oil to move down on the stick. I have 8-10 hours on it since the oil change. It does not appear to be oil, it is a black thick gunk, more like unburned fuel, or maybe sludge that had built up before I got it.
When I got it, it was not reving past about 1,500 RPM. I now have it set to around 1,900 RPM no load. Maybe it is just spitting out some built up stuff?
I will watch it closely to see if it increases, decreases, or even stops slobbering.

Post by **Lavoy** » Fri Nov 10, 2006 11:21 am

I am kind of leaning towards bad injector/s.
Go to an auto parts store and get a cheap A/C thermometer and put it in the radiator neck to check temp. They are only a few bucks, but a great tool to have. If you want to spend some more money, you can get an infrared thermometer too.
Lavoy

hunter41mag · Post by **hunter41mag** » Fri Nov 10, 2006 3:11 pm

Yes, if it is not using oil than Lavoy is probably right about the injectors/nozzles or engine temp to low. In your one reply you did not mention anything about engine idle time. Do you let the engine sit and idle for extended periods (more than 5-10 minutes)? If so I saw alot of diesel engines with oil slobber out the exhaust joints because of prolonged periods of idle.

Don
Eastern PA
440IC

JD440ICD2006 · Post by **JD440ICD2006** » Fri Nov 10, 2006 11:46 pm

Don,

We can rule out long idle times as the culprit to the slobbering on mine. As soon as I read the manual I was cured of any extended idling of this engine. It said that the oil pressure would be around 5 PSI at idle, and it is better to restart than to idle as long as the engine is not hotter than about 170 degrees.
I have narrowed it down using all of the replies and it looks like either old stuff that is now coming out or injectors as Lavoy stated. It just starts so well and runs smooth, I guess I do not understand the injectors on this one. I have had Waterloo diesels with bad injectors and not only did they slobber, but they did not start as they should or ran rough at idle.

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