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Old 01-07-2018, 09:35 AM   #15
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You can get at the glow plugs from removing the top cover. They are on top of the engine.
Removing the top cover is the hardest part of the job. In the summer it takes more cranking of the engine to start. That's because the glow plugs don't come on.
To check the glow plugs take the leads off the top of them and put your ohm meter leads one one where you took the wire off and the other to the engine block.
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Old 01-07-2018, 11:47 AM   #16
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Originally Posted by Eagles16 View Post
Had the same problem, there are three fuses under the access panel of the generator. One fuse 25 amp is for the glow plugs, if this fuse is blown the glow plugs won't heat...
I wish it was just the fuse but I'm not so lucky.
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Old 01-07-2018, 11:50 AM   #17
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Attached is the parts manual for your generator which says your glow plugs are part# 185-5421 (page 16)
Great thanks! I tried ordering them from NAPA but could not without a specific parts number.
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Old 01-07-2018, 12:01 PM   #18
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Originally Posted by oldguy70 View Post
You can get at the glow plugs from removing the top cover. They are on top of the engine.
Removing the top cover is the hardest part of the job. In the summer it takes more cranking of the engine to start. That's because the glow plugs don't come on.
To check the glow plugs take the leads off the top of them and put your ohm meter leads one one where you took the wire off and the other to the engine block.
That's my next step now...I saw on youtube how to test them with my ohmmeter so will do that. Unfortunately it is too cold here again to do anything right now. Now waiting for a bit warmer weather.

In the summer it fires right up without hardly any cranking. So that's not normal?

In the cold all it does is crank over, hence I'm thinking a glow plugs issue.
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Old 01-07-2018, 01:50 PM   #19
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Had the same problem, there are three fuses under the access panel of the generator. One fuse 25 amp is for the glow plugs, if this fuse is blown the glow plugs won't heat...


I had the same problem the fuses were blown and would not start in cold wx, but while in for service at the cummings dealer, had the glow plugs changed and now starts in all wx
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Old 01-07-2018, 02:00 PM   #20
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Hello Joe, I pushed the switch down to prime for a minute then I hold the start button down until it's about to start then let go...I do that 3 times to get the glow plugs hot. That usually works when it is cold out but not today.
I would continue to hold the start side down until it actually starts!
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Old 01-07-2018, 02:38 PM   #21
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You might want to pull a glow plug and see what the part # stamped on it is - The glow plug's for my 10.0HDCAA are ~$35 from Cummins, they are NGK and ~$12 for an NGK. but there is no cross reference that I am aware of. If you do a forum search for NGK glow plugs there are a number of previous discussions on this subject.
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Old 01-07-2018, 02:48 PM   #22
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I would continue to hold the start side down until it actually starts!

Yep I did that...lots of cranking but no starting. I just cycled the preheat 3 times to make sure the glow plugs were good and hot. It was a few degrees above freezing but that should not have been too cold for it to start fairly easily..
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Old 01-07-2018, 02:50 PM   #23
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You might want to pull a glow plug and see what the part # stamped on it is - The glow plug's for my 10.0HDCAA are ~$35 from Cummins, they are NGK and ~$12 for an NGK. but there is no cross reference that I am aware of. If you do a forum search for NGK glow plugs there are a number of previous discussions on this subject.
I now have a part number for onan cummins...I would be good to get the cheaper NGK but if not I will bite the bullet on the OEM.
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Old 01-07-2018, 06:33 PM   #24
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I now have a part number for onan cummins...I would be good to get the cheaper NGK but if not I will bite the bullet on the OEM.
Irishguy,

The glow plugs you have in it are most likely made by NGK, The Cummins part # you have will be most likely be for an NGK glow plug in a Cummins box. Deciphering the NGK part # stamped in the old glow plugs can be a bit challenging but if you can read all or part of the number on the old glow plugs - (which will most likely be an NGK number) you should be able to figure out what they are. Either way you will probably end up with the same glow plugs, just at a different price.
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Old 01-07-2018, 08:40 PM   #25
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Irishguy,

The glow plugs you have in it are most likely made by NGK, The Cummins part # you have will be most likely be for an NGK glow plug in a Cummins box. Deciphering the NGK part # stamped in the old glow plugs can be a bit challenging but if you can read all or part of the number on the old glow plugs - (which will most likely be an NGK number) you should be able to figure out what they are. Either way you will probably end up with the same glow plugs, just at a different price.
Great info Kurt...hopefully I can get the less expensive plugs. Although up here in Canada our selection choices are no where near like it is in the States. It can be a real roll of the dice up here. NAPA ran my generator serial # but found nothing. They said they need the part number. We'll see tomorrow.
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Old 01-07-2018, 08:55 PM   #26
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I replaced the glow plugs in our generator. It's a 12.5k and I'm not sure if the 7.5 is the same.
Onan 12.5kw generator glow plugs
It's a 15 min job. Look at posts 6 and 7.
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Old 01-08-2018, 05:26 AM   #27
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If you find an alternative to the Cummins #, please let us know. I have the same generator and would be interested.
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Old 01-08-2018, 06:18 AM   #28
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Your Onan HDKAJ has a Kubota Engine ! ( D905 in fact).
Just Google Kubota D905 Glow Plugs and you'll find Prices all across the board.
Here is where I buy all of my Kubota Parts>>Kubota tractor parts catalog | Kubota engine parts
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