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Old 01-02-2011, 09:37 PM   #1
Richard and Rhonda
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Default Generator Motor Tuneup

My gennie, a 20KW Kohler, powered by a 4TN84TE Yanmar engine, was running very rough and smoking at times. It has always run a little rough and rumbly but since it ran that way since I bought the coach, I thought it was the nature of the beast.

During my adventure of working on the Series 60, I ran the gennie a lot to power the furnace and air compressor for the impact wrenches. It ran rougher and rougher over the last couple of months.

I decided to pull the injectors and set the valves. The tips of the injectors were completely covered in carbon and the injector tube in the head was occluded by carbon deposits. I cleaned the injector tips with a bronze brush, and disassembled the injector nozzles. I squirted a solvent through the tips to make sure none of the holes were boogered up. Then reassembled the injectors with ATF as the lubricant.

It took less than an hour to put the injectors back in and set the valves.

OH MY!!!!! I have a new generator.

It runs much smoother and quieter. No rumbling or stumbling like it used to do. The stumbling would wake me up at night when we were boondocking. It makes sense, the big generators really don't do much more than idle unless we are parked in the sun with all AC's blasting. The idling tends to build up carbon in the diesels.
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Old 01-05-2011, 03:59 PM   #2
prairieschooner
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I would find that carbon build up on boats when the engine wasn't being loaded or coming up to temperature properly. You do need to be sure that you do not scratch the tip of the injector when cleaning it otherwise the build up may happen more quickly.
The two things that are normally checked when proving an injector are the pressure that it takes to pop open the injector and the spray pattern when it pops open.

just a little advice for future refence.
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1982 Newell 38' (built before #1) 6V92 DD, 5 Speed Allison, 12.5 KW Kohler, Couch used to make into a Bed but I fixed it!
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2007 Yukon, 1981 CJ7 Laredo, 2002 Honda CRV, 1955 Thunderbird, 1952 Pontiac Sedan Delivery, 1952 Ford 8N, 1958 Airstream, 1959 Glasspar 16' Avalon, Cabin in the Woods........what will I work on next
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Old 01-05-2011, 04:48 PM   #3
chockwald
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Steve, you are a diesel Savant......
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Old 01-06-2011, 05:08 PM   #4
prairieschooner
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I wouldn't go that far, just familiar.
1st diesel that I worked on was over 40 years ago, there was a small gasoline engine to turn it over until it got oil pressure and then flip the compression lever. I think that it was a D8, I ran and worked on that monster all summer that year.
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Steve & Tricia
1982 Newell 38' (built before #1) 6V92 DD, 5 Speed Allison, 12.5 KW Kohler, Couch used to make into a Bed but I fixed it!
https://newellshowcase.com/thumbnails.php?album=214
2007 Yukon, 1981 CJ7 Laredo, 2002 Honda CRV, 1955 Thunderbird, 1952 Pontiac Sedan Delivery, 1952 Ford 8N, 1958 Airstream, 1959 Glasspar 16' Avalon, Cabin in the Woods........what will I work on next
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