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Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke


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  #21  
Old 01-04-2018, 05:48:58 PM
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Default Re: Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke

Lines look right to me. Cheers Dan
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  #22  
Old 01-04-2018, 06:22:52 PM
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Default Re: Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke

Hey Guys, this is my plan to check after thevalve clearance and spray pattern, attached is the page I have for inj pump timing, I will have to use method 2, I dont have a depth microp
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  #23  
Old 01-04-2018, 08:03:11 PM
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Default Re: Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke

Measuring each injector volume PER SPRAY EVENT would be a good idea. That's essentially what a diesel injection shop does other than they measure it through the throttle ranges.
Correct me if I am wrong, does the injection pump START at full stroke (Full throttle) or does the governor limit for starting?
BBC in Canada seems to have a lot of acquired knowledge about these machines.
This will be interesting to find out what the problem is. Keep us posted.
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Old 01-05-2018, 07:21:00 AM
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Default Re: Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke

From what I remember, white smoke means a new Pope has been elected...
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Old 01-05-2018, 09:57:28 AM
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Default Re: Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke

Motorhead, I dont know what you mean exactly about starting at full throttle or not? if youre asking if it starts at 1800 rpm and remains there the whole time load or no load from the head then the answer is yes, it does. I will look into contacting BBC, anything special this stands for BBC, I will try to google and see what comes up..

Last night I had the itch and I was looking verry closely at the marks, and this is what I found, might be something or not, so the inj pump has a hole on the side, like a pin hole to match up the pump (zero mark I will call it) that is supposed to match up exactly with the PC mark on flywheel. correct? well I used an allen wrench to slip in and there is 3 flywheel teeth (NOT PLAY) but solid turn FW (flywheel) and pump moves with it, no play at all. BUT here is the findings,I can turn the FW till it stops from allen stopping it and go the other way till it stops and 1st it stops 1 tooth before PC and turn FW other way like its running clockwise and allen stops it at 2 teeth past PC see pics. you can see the PC marking before PC and second pic is 2 teeth after PC where you cant see ther marking PC. so am I off 1 tooth?
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Old 01-05-2018, 10:00:02 AM
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Default Re: Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke

So in a short sentence I am not literally in the center of the 3 teeth movement around the PC mark. I dont know if I pull IP and move it 1 tooth will it correct it or still be off just on the other side of the PC mark.??? any thoughts???

Thanks Motorhead

Steve
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Old 01-05-2018, 11:01:31 AM
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Default Re: Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke

Get manual 974-0750 go to the section on timing the JC. Looks like you are getting the two confused.
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Old 01-05-2018, 12:40:51 PM
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Default Re: Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke

Any generator set with a mechanical governor, gasoline, gaseous or diesel, will start at full fuel/wide open throttle. As the engine comes up to rated/set speed (3600, 1800, whatever), the governor will close the throttle/fuel rack to supply just enough fuel for rated speed and load. Most electronic governors will exhibit this same behaviour. Others will have to chime in on the electronic governor operation. I do know that my (sorry, guys) Generac electronic governor retrofit on my 4.0cck starts at wide open throttle and then closes to rated speed/load. zuhnc
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  #29  
Old 01-05-2018, 01:14:28 PM
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Default Re: Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke

Billy J Shafer,

Thanks, I am looking at it on my breaks here at work, which 2 am I confused on, should I check it with the depth micrometer? checking on the shims being correct or not? or what else is there to check?

By the way, I was reading this manual and it shows in diagram 63 page 54 that there is supposed to be a Gasket?????? OOPS there wasnt one there when I took the pump off to be rebuild, just the shims were there? could this be or at least add to the problem??? ANYONE/EVERYONE? Please advise.

Steve
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Old 01-05-2018, 02:33:46 PM
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Default Re: Onan 12MDJC-3R/2268D Serial #16c859299 White Smoke

Dan, would not having a gasket on the ip make this type of a difference in running or at least add to it or not?
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