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Old 28-07-2013, 10:19   #1
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Cleaning injectors on Onan generator

Question for the mechanically inclined- we have an ancient but functioning Onan MDKC-L generator. When changing the filters, we noticed the old one was pretty gummy. We are also having quite a bit of sooty exhaust when running the generator. Cleaning the diesel tanks is certainly on the list, but we want to clean the injectors on the generator itself as we think that might be the reason for the excessive soot.

The challenge is that we can not find anything online for a replacement part, the part number or a manual to help direct the removal andor DIY instructions on how best to resurrect the injectors. We are interested in either finding a replacement injector assembly, a bit of know how to help us DIY it or someone reliable in the Clear Lake/Kemah are to service ours if that is the way we should go. Any ideas?
Thanks!
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Old 28-07-2013, 11:46   #2
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Re: Cleaning injectors on Onan generator

Generally not a great idea to rebuild them yourself. Take them to any diesel injector/pump shop for a rebuild. Should cost <$100 per injector including testing and new crush washers for install.

Google for an injector shop near you that services commercial gear.

Also check the exhaust elbow for carbon buildup.
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Old 28-07-2013, 12:11   #3
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Re: Cleaning injectors on Onan generator

Thanks! We were thinking it best to go with a pro, which is why we were looking for recs for a local shop. Picking from Google search can be hit or miss.

No worries on the exhaust elbow, its been replaced.
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Old 28-07-2013, 12:19   #4
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Re: Cleaning injectors on Onan generator

Quote:
Originally Posted by Mimsy View Post
Thanks! We were thinking it best to go with a pro, which is why we were looking for recs for a local shop. Picking from Google search can be hit or miss.

No worries on the exhaust elbow, its been replaced.
It's hard to imagine a commercial injector shop screwing up an injector rebuild. These guys do that all day, every day and wouldn't be in business long if they couldn't do it correctly.

Now an injector pump rebuild could be a different story.

BTW, you don't want just a mechanic doing this - you want to take them to a shop that specializes in diesel injectors and pumps. There is special equipment and clean rooms for this.

Here is an example of what I am describing (sorry it's not in Texas): Baltimore Diesel Service, Inc.

Mark
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Old 28-07-2013, 12:27   #5
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Re: Cleaning injectors on Onan generator

Thank you!
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Old 28-07-2013, 14:30   #6
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I've used these guys with great success on some bizarre injectors off a ships generator engine. They're not too far away from kemah either.

http://www.dieselpumpinjector.com/?emvAD=320x278

Although you really need to price new injectors too, sometimes they cost less than a rebuild.
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