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Carbon buildup

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Jeb Mcranie

10-15-2002 15:57:01

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Is it true that idling a diesel for extended periods of time causes carbon buildup? I heard this from my neighbor, who has been a mechanic for 35+ years. I think this is one of those shop tales mechanics say just to scare you. Want somebody elses opinion on it before I come to any conclusions.

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Henry

10-16-2002 15:39:42

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Re: Carbon buildup in reply to Jeb Mcranie, 10-15-2002 15:57:01

It is absolutely true. I worked in an outfit that did durability tests on accessory drives by idling engines continuously. 600 hours will kill a GM 3.8 gas engine (oil pours out the exhaust). 2500 hours idling a 4 cylinder Ford Escort diesel will carbon it so bad that it wouldn't run. We would pull them apart, bash the carbon out of them, and put them back together again, replacing only the valve seals. They would run again after that. The carbon build-up was so bad there were only small holes in the middle of the exhaust manifolds. After 3000 hrs+ of idling, the engines were so worn out that if you cracked any one of the injectors, it would quit.

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Jeb Mccranie

10-16-2002 16:07:20

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Re: Re: Carbon buildup in reply to Henry, 10-16-2002 15:39:42

Is there anything you can put into an engine to remove the carbon without tearing it down?

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david

10-16-2002 12:05:37

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Re: Carbon buildup in reply to Jeb Mcranie, 10-15-2002 15:57:01

I've never seen excessive carbon build up tearing one down but a lot of other problems. I'd suspect it can happen. I've got an '02 Cummins in my pickup and after a lot of idling out in the field, first time I really get into it on the road with a load huge burst of black smoke.

Used to see a lot of diesels that people used to set tobacco with back in the 80's that were in for overhaul with trashed bottem ends. Seems that they would idle them for hours pulling tobacco setters which keeps them from ever really warming up. That leaves a lot of unburned fuel washing down the cylinder walls. Then, about 2 weeks after setting, they would run them wide open round baling. This with the crankcase oil contaminated with fuel. Really chews the main bearings and rod bearings. After about 5 or 6 seasons time for an o.h. Most of my manuels call for an extended idle of not less than 1000-1200 rpm is <60 degrees. In fact I've got a Ford 7710 that won't keep the cab comfortable in the winter at <1400.

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Elmer

10-15-2002 20:03:47

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Re: Carbon buildup in reply to Jeb Mcranie, 10-15-2002 15:57:01

I have seen it on cars but not diesels. Had an old timer bring in his 1968 Olds Culass that ran real bad. The mechanic i was working with at the time took the car out for a drive and pounded it pretty hard. Got the temperature up real warm. Came back to the shop and poured a quart of ice cold water slowly into the carburetor with the throttle open. Ran the engine at about 2500 to 3000 rpm. Black soot came blowing out the exhaust and it ran like a top after.I guess it could be possible on a diesel too.

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