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Onan Generators

Onan MDJA 3.0-3CR /2268V


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  #11  
Old 03-01-2017, 12:16:40 AM
Crankpot Crankpot is offline
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Default Re: Onan MDJA 3.0-3CR /2268V

Here is the new part temporarily Intl led. It works great. When the new muffler arrives I'll paint it all wth high temperature paint to slow corrosion.

I ran It for two hours at full load to complete seating the rings. Now I gets another oil change and a new filter. Only one small oil leak was found. It's a little orange rubber part the surrounds the anti flicker pushrod call a diaphragm. Anyone have a spare? Mines perforated.
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  #12  
Old 03-03-2017, 09:26:58 AM
Crankpot Crankpot is offline
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Default Re: Onan MDJA 3.0-3CR /2268V

Now that its been running ok I waned to check the head bolt torque and verify the valve clearance. I again found the clearances way off. Here is a picture showing the elastic stop nut (on left). This cant be what the engineers intended! These valves get hot and there's no way an elastic stop nut can hold its torque in this application...

I added the milspec style metal lock not style shown on the right valve to both valves. Reset them and I expect no further issues.

I also found that by evenly torquing the valve cover head bolts the pesky oil leak has stopped.
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  #13  
Old 03-06-2017, 01:43:31 PM
Crankpot Crankpot is offline
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Default Re: Onan MDJA 3.0-3CR /2268V

I got the new walker
Muffler in the mail yesterday. A little time with the syncrowave fabricated mount bracket sand voila! It's nice and compact now, quieter. I can push the genset closer to the wall now. My joints leak where the flex pipe joins the pipe
But I'm working on it. I ran it a few hours after changing out the water for real coolant.

Check out the hybrid paint job! As I work on it I paint it green. I figure 12 more years it will be all green. Lol!
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  #14  
Old 03-06-2017, 06:39:51 PM
rmchambers rmchambers is offline
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Default Re: Onan MDJA 3.0-3CR /2268V

The only thing I'd say is that it's an MDJA which were used out on the water where there was little dust to ingest. That thing on top is a resonator not a filter and the engine sucks raw air in through that little round hole below it on the intake manifold.

My MDJA is like this too so I made a bracket to hold a pleated air filter and put a chrome button in that hole so it gets filtered air now. Something to think about. I also put a clear bottom of a popcorn plastic jar over the air filter to help quieten the intake noise and protect the pleats if it got any moisture on it when it ran.
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Old 03-07-2017, 09:00:16 AM
PopsGarage PopsGarage is offline
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Default Re: Onan MDJA 3.0-3CR /2268V

Good job, I installed a MDJB at my home back in 1999, I plugged the air intake hole and installed a air filter from a 16 hp kohler engine on top of the resonator.
Bob
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  #16  
Old 03-08-2017, 03:29:04 PM
Crankpot Crankpot is offline
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Default Re: Onan MDJA 3.0-3CR /2268V

Yes thanks for The advice. I posted A request for an air cleaner but no Replies so far. I'll cobble up an air cleaner when I can!
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Old 03-08-2017, 06:58:15 PM
armandh armandh is offline
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Default Re: Onan MDJA 3.0-3CR /2268V

Quote:
Originally Posted by Crankpot View Post
I found a head gasket for $30 and a set of .030" oversize rings also for $30. I will file the rings down to size. It's absurd how expensive parts are for these aging engines are. I saw ring sets for $140 and pistons for $500. I guess someone is paying these amounts or they wouldn't be for sale. The newer Japanese generator engines are looking much better now...
how many years at the cabin???

average life of a junkeraator in prime service ..... just days
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Old 03-11-2017, 10:15:57 PM
Crankpot Crankpot is offline
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Default Re: Onan MDJA 3.0-3CR /2268V

I rigged up a little air cleaner. I used one from a Briggs and Stratton engine. I drilled and tapped the intake duct and bolted the air cleaner on with a couple 10-32 bolts. Seems to work just fine.
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  #19  
Old 04-10-2017, 07:42:16 PM
Crankpot Crankpot is offline
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Default Re: Onan MDJA 3.0-3CR /2268V

I added this little pipe thermometer to the genset. These thermometers are normally held to a pipe with a spring. I used a big blob of silicone. It works great and accurately indicates temperature. My range is 52 c to 62 c fully loaded.
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