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Onan GenSet - project rebuild


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  #11  
Old 06-19-2017, 11:08:32 AM
gmdoctor gmdoctor is offline
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Default Re: Onan GenSet - project rebuild

Len, this was someone else's attempt at running this set. it worked only long enough for me to get it to run. The regulator and shut off are just two pieces on my to get list. I noticed that there are other refurbs out there and each have their own way of using LPG/propane. In automotive use, there is always a regulator/shut off solenoid in place. I would feel better knowing that this setup is installed.
And thanks for the spec, it helps knowing that so i can purchase the correct regulator.
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  #12  
Old 06-19-2017, 11:17:19 AM
len k len k is offline
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Default Re: Onan GenSet - project rebuild

Yes need a solenoid shut off valve for saftey.

Others are better with vapor fuel than I am, they will be along shortly.
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  #13  
Old 06-19-2017, 08:20:41 PM
Max Thompson Max Thompson is online now
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Default Re: Onan GenSet - project rebuild

While at the twainslan site getting manuals, download tech manual T-015 gaseous fuels manual for fuel info.

You will also need the YD gen-end manual #900-0184 for generator wiring. I have not seen "wiring harnesses" for sale, nor have I had need for one. All the wiring in the control box and engine wiring can be "made". Get a roll of good quality wire, take a piece of the original wire to an elec. supply house and buy a 100' roll, this will be enough for several JCs. So far I have not seen mice do any real damage to the generator leads, they tend to pick on the smaller control wiring.

Look in all the nooks and cranny's for rodent residue. Lots of compressed air will be a big help, use it liberally. I also recommend opening up the starter and doing any PM needed. If you are not comfortable with the starter, let a rebuild shop check it out.

I will agree with Billy, run it on gaseous fuel. This will eliminate many potential problems.

You found a set that has great potential barring any major unforeseen defects.
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Old 06-19-2017, 08:52:57 PM
Leon N. Leon N. is offline
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Default Re: Onan GenSet - project rebuild

Hey Billy; re your comment: "Look at the amp meter. If it is charging it is producing power". Many models have a separate stator winding for charging the starting battery. So I suppose, one could have a damage or burnt out stator power windings and still have a good AC source for the battery charger. Sorry, just a nit.
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Old 06-20-2017, 10:49:41 AM
gmdoctor gmdoctor is offline
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Default Re: Onan GenSet - project rebuild

Max do you have a link to the twainslan site? also the wiring appears to be 12-14ga stranded copper, i have access to rolls of this. My biggest question is where are you guys getting your parts from? Local places that deal directly with the factory? Is there an online place that i can use to start ordering parts? I have a vested interest in getting this genset up and running quickly as we already are in hurricane season and have storms moving about in and around the gulf. Also i've been reading up on the regulators used for these, I see that Garretson is a recommended unit. Anyone with a more narrow of a list to choose from? There are too many for me to decide which will fit the bill, with my limited knowledge of this. My list of needed parts grows, and i have yet to find an online source to Onan where i can put in my model number to order parts from.

nothingbutdarts- i have pulled the bell end off only to see a rather clean looking end only some surface rust. The area of the charge resistor is clear of any anomalies or debris that i could visibly see. The VR is intact, but was chewed on only on the ends and everything was covered in nest material and old food and feces. so far i have been lucky to have just these small issues. I still have to pull the exhaust manifold and that is going to be a chore. Anyone know of the paint that's available for these to bring them back to original?
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Old 06-20-2017, 11:19:16 AM
nothingbutdarts nothingbutdarts is offline
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Default Re: Onan GenSet - project rebuild

See the link in post #4 in this thread!
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  #17  
Old 06-20-2017, 11:19:24 AM
gmdoctor gmdoctor is offline
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Default Re: Onan GenSet - project rebuild

Ok guys sorry i'm not paying attention here. found the link to the manuals in a previous reply from Ray and Max got me right to what i needed. Thanks again!!
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Old 06-20-2017, 11:21:22 AM
nothingbutdarts nothingbutdarts is offline
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Default Re: Onan GenSet - project rebuild

https://www.smokstak.com/forum/member.php?u=19607 Onan parts is a member here, look at the contact tab.
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Old 06-20-2017, 06:38:02 PM
Max Thompson Max Thompson is online now
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Default Re: Onan GenSet - project rebuild

I buy parts from Cummins when I do not have what I need rat holed away. I also buy parts on flea-bay when I find a bargain, picked up a JC air filter for about $15 shipped the other day. Already have a few air filters on hand, but $15 is a pretty good price. The same applies for gaskets, ignition parts, low oil switches and even VR boards, I keep a supply of all on hand bought at various times and places.

The Garretson “KN” demand regulator is a good choice. I picked up 2 a while back for around $45, 1 with elec. primer from Century Fuel Products. The other, without the primer was from a flea-bay seller. Century also had the best price I have found on “Asco” elec. solenoid valves. I tried a couple of the $25 Chinese solenoids but they got “very” hot after holding open for a while, I would not recommend them.

VR boards come from Flight Systems, great bunch of guys, fantastic product and service at much better price than Cummins / Onan.

Throttle linkage rod ends come from Mc Master Carr.

Inside your control box, you may have automotive style cube relays since your set is relatively new. If you have the old open ignition / start disconnect relay, we have replacements for them.

If you will be within 15’ of your LP gas supply, ½” black iron pipe will do, ¾” to the first valve would not hurt anything. There should be a primary regulator at the tank, locate a second stage regulator (11” WC) where you tap the line from the tank. I would put a ball valve where you tap the tank line and another at the set ahead of the elec. solenoid valve. You cannot have too many valves and they cannot be too handy. If you will be a greater distance from the tank line, you might want to run high pressure to a point near the set then locate the second stage regulator at the set. This will allow you to run small pipe (3/8” copper) from the tank line to the second stage regulator.

I almost forgot, you need to find another JC for a backup set. Then maybe a JB for night time use and a couple CCKs or BFAs incase you have a prolonged outage and fuel gets low.
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Old 06-20-2017, 08:30:09 PM
Ray Lynch Ray Lynch is offline
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Default Re: Onan GenSet - project rebuild

In addition to Century, the attached link is another source and sells original Garretson regulators made in the USA as well as the solenoid valve.
Ray

https://carbturbo.com/product/garret...co-kn-039-122/
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