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Tool Talk Discussion Forum

Detecting Diesel engine misfiring

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Roger Russ

10-20-2005 09:48:53




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I have a possible solution for detecting which cylinder on a Diesel engine is mis-firing.

I have used an infrared thermometer for use on a race car. It is a Sears instrument with a laser marker. Part number on it is 82327. It is hand held and costs $50.

If you can get to the individual runners on the exhaust manifold you could measure their temperature with this instrument. The cold cylinder is the one mis-firing. Might be able to detect heat (cold) in the individual injector that is mis-firing. Siamesed exhaust runners would be more difficult, but perhaps possible to detect the cold one.

Be careful around the fan blades and belts, etc, but it sure beats trying one injector replacement at a time.

Hope this helps someone!.

Roger in Iowa

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jon holt

10-22-2005 16:09:03




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 Re: Detecting Diesel engine misfiring in reply to Roger Russ, 10-20-2005 09:48:53  
I have used this tip for several years working on diesel trucks and it works well



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JL Sargent

10-21-2005 14:33:51




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 Re: Detecting Diesel engine misfiring in reply to Roger Russ, 10-20-2005 09:48:53  
It would help to know what engine your referring to. If its a late model computer controlled engine then the correct hand held computer can tell you. Like for a GM product the tech II can tell you which cylinder is not firing.



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RJ-AZ

10-20-2005 19:26:59




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 Re: Detecting Diesel engine misfiring in reply to Roger Russ, 10-20-2005 09:48:53  
I just got a new Craftsman DVM with IR laser pointed temp sensor that is pretty neat. I have used it on a JD powered GenSet just to check it out and it will give good uniform temps all along the exh manifold. I have used a spray bottle on the older Cummins and Cats with success. Just watch for the exh port that doesn't dry off as fast as the others.



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Hermit

10-20-2005 17:58:32




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 Re: Detecting Diesel engine misfiring in reply to Roger Russ, 10-20-2005 09:48:53  
Some people just remove the exhaust manifold and see which port is puffing gray, unburned exhaust.



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Mike M

10-20-2005 12:53:18




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 Re: Detecting Diesel engine misfiring in reply to Roger Russ, 10-20-2005 09:48:53  
You can also loosen up one injector line at a time. This will cause the one loosened to missfire,so if you loosen one and it doesn't change that's the one.



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Bob

10-20-2005 13:28:23




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 Re: Detecting Diesel engine misfiring in reply to Mike M, 10-20-2005 12:53:18  
The "loosen the injection line" trick doesn't work real well on "distributor-type" injection pumps (read "Roosa-Master DB-series"), as the cylinder FOLLOWING (in firing order) the one who's line you've loosened, may also missfire, making it hard to pin down which cylinder was missfiring in the first place.



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msb

10-20-2005 19:09:01




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 Re: Detecting Diesel engine misfiring in reply to Bob, 10-20-2005 13:28:23  
Have to agree with Bob on this.Tried it many times and was wrong more than I was right.Even tried a stethescope and that was less than satisfactory.If one nozzle is acting up, it is a good idea to pull and check them all.Don't know why ,but I have found there are usually two that need attention.



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