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Onan GenSet - project rebuild


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  #31  
Old 07-20-2017, 05:40:19 PM
len k len k is offline
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Default Re: Onan GenSet - project rebuild

Yes likely froze

7NHM consumes propane @ ~ 1.5 gal/ hr at full load, so guessing a 4.0BFA takes 1 gal/hr MAX. MAX MAX.

20# BBQ tank holds ~ 4.5 gal , and they fill to ~80% ( 3.6 gal) so if kept tank warm one tank should run 4 BFA ~ 3.6 hours. Not only 2 hours

Maybe a fan will help

Last edited by len k; 07-20-2017 at 07:02:36 PM.
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  #32  
Old 07-21-2017, 07:04:43 AM
gmdoctor gmdoctor is offline
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Default Re: Onan GenSet - project rebuild

once again, this guy just wanted this set removed from his trailer as he had purchased a newer and much larger gas model. Which was good for me! So to be exact on how much was consumed or used or frozen (which has happened to me) i cannot be sure. I just repeated what he had told me. So this weekend i will test this. As i set it up, i will report back to here and try to validate his story.
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  #33  
Old 07-21-2017, 06:07:25 PM
soundbos soundbos is offline
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Default Re: Onan GenSet - project rebuild

Quote:
Originally Posted by len k View Post
20# BBQ tank holds ~ 4.5 gal , and they fill to ~80% ( 3.6 gal)
LPG weighs 4.2 lb per gal 20 lb tank is 20 lb at 80% 4.7 gal
Most 20# tanks that you get from places like exchange racks only have about 2.5-3 gal in them
Get your tanks refilled from a good LPG dealer and you will get 4.5-4.7 gal

Butch
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  #34  
Old 07-22-2017, 04:11:07 AM
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lokay5 lokay5 is offline
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Default Re: Onan GenSet - project rebuild

Cylinder Capacities in Gallons and BTU's
Size 20#
Gallon Capacity 4.8
Total BTU Capacity 441,600

Using these factors we can arrive at run times based on average load for any generator.
For instance:
How long would a 5000 Watt Generator with a 10 HP engine at 50% load run on a 20# propane cylinder?
10hp at 50% load would be using 5 horse power to generate 2500 watts of energy.
5hp x 10,000 btu would consume 50,000 btu per hour.
Using a 20# cylinder that produces 441,600 total btu, the engine consuming 50,000 btu per hour would run for about 8.8 hours.

************************************************** ************************************************** ********************

20# Tank

Maximum Continuous Draw In BTU Per Hour -

@ 0 F - 36,000 BTU

@ 20 F - 51,000 BTU
__________________
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Last edited by lokay5; 07-22-2017 at 07:54:19 AM.
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  #35  
Old 07-24-2017, 07:03:02 AM
gmdoctor gmdoctor is offline
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Default Re: Onan GenSet - project rebuild

darn weather was so bad here this weekend, i couldn't even open a garage door. Still on weather hold
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  #36  
Old 09-11-2017, 09:27:54 AM
gmdoctor gmdoctor is offline
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Default Re: Onan GenSet - project rebuild

Ok guys, finally i was able to test this guy. #20 tank did run the little guy but not before i ran into multiple issues. Had multiple leaks i had to repair, then adjusted the carb to gain max efficiency. Then electrical issues arose as the test continued. The person before me had a RV female plug in an electrical box and then a second box attached to it for a regular 120v receptacle. i had started with the 120v rec. for a small load for 30min. i didn't run an amp meter since it was a first run. more of just seeing what it can do. next i went to plug in the 30amp RV receptacle, killed the generator. would not restart, i unplugged the recp. and it started back up. found the recp. was shorted. since i didn't have a spare and was running out of time, i used the 120v rec. i ran a bunch of cords to a large power strip i use for Christmas lights i made years ago. i put everything on this generator i could throw at it. 2 large refrigerators, a larger deep freezer, 2 5000btu window a/c units, every light i had available in the garage ( 8 8' florescent bulbs), one large high volume floor fan used in my shop. total just over 5k watts. i only ran full like this for a few min and added things one at a time. total run time was just over 3 hours when i shut everything down. Still have the small #20 tank with fuel, but very little. now that i have the bugs worked out, my next test i will use a load bank and an amp meter and a better tank. I failed to weigh my propane tank before i had started.
next test i will set a better reference table and have everything working correctly. On another note, my 15k JC unit i have tried to refurbish had a major failure. i never touched the engine other than to clean, repair broken bolts, replace small gaskets and hoses. i started this big guy up hoping it would be the last of my worries during the current hurricane. it didn't run 30 seconds when i noticed oil spewing from the rear head area. This thing has a blown head gasket!! ok now i need a head gasket, i know you gave out the Onan link for getting parts. But i spoke to someone there and even sent them my email with what i needed. i never got a call back, and i received an email over 2 months later stating no parts available. So again does anyone have a lead on Onan parts? My local RV center sees me as a gold mine, charged me out the wazoo for the parts they could get. many places on the web also advertise parts, but cannot get them.
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  #37  
Old 09-11-2017, 10:26:59 AM
Max Thompson Max Thompson is offline
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Default Re: Onan GenSet - project rebuild

Try "Onan Parts" who is a sponsor here at The Stak.

Are you sure it is a head gasket? I would pull the valve covers and check torque on all head bolts before I pulled the head.
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  #38  
Old 09-11-2017, 11:00:29 AM
len k len k is offline
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Default Re: Onan GenSet - project rebuild

Most people use hair driers and space heaters for load.
~ 1500 watt each gets you to full load fast.

Propane tanks have their empty weight stamped on top ring, labeled TW (tare weight). New 20 # tank is usually 16.5 to 18.0 pounds. That's how I sort out which tanks are empty before refilling. I use an old accurate scale someone threw out, has sliding weights.
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  #39  
Old 09-11-2017, 12:03:09 PM
nothingbutdarts nothingbutdarts is online now
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Default Re: Onan GenSet - project rebuild

As mentioned try "OnanParts" or, I just called my local Cummins/Onan dealer,

For part # 0168-0208 which is a valve grind gasket set for a JC, has both head gaskets and all related gaskets, valve stem seals and what not, it's $87.00. Mind you they have to order it and would take about 2 weeks.
The two weeks is just bringing it in on a normal stock order and no freight charges, if needed quickly, I'm sure they could get it AT an additional charge!

Last edited by nothingbutdarts; 09-11-2017 at 12:06:43 PM. Reason: added info.
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  #40  
Old 09-16-2017, 10:56:22 AM
gmdoctor gmdoctor is offline
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Default Re: Onan GenSet - project rebuild

Max i ordered the head gaskets and will pull it down probably later today after work. yes i know for a fact its a head gasket. i can see where the head meets the cylinder its coming out.

i ordered the head gaskets from cummins through a dealer who sells cummins products. i had previously ordered multiple gaskets for the engine but never got the head gaskets. now i have the entire upper end kit. but i pieced it together instead of a grind set. cost was higher but got to the same conclusion.
anyone looking for a 4.0 BFA? i don't know any numbers off the unit, but since I've been playing around with these two i have had multiple people wanting to get rid of theirs. mostly from collecting dust and no understanding of the units. people just want a turn key unit now. I have no use for a second 4.0 BFA.
I do however have a lead on an Empire 50kw unit with a 6 cyl cummins unit cheap! worked when pulled. backup for a small store. Anyone with knowledge of these units from Wisconsin? Model 500DFW-8E Serial 380-106
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