Home » Public Forums » GMCnet » [GMCnet] Onan repair or replace
| [GMCnet] Onan repair or replace [message #317393] |
Thu, 11 May 2017 16:01  |
mjbourgon
Messages: 259
Registered: May 2010
Karma: -1
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Hi all. It would appear the my Onan is biting the dust. The generator
man and I have had enough of trying to keep the old girl running. I am
wondering if some of you have changed the old dog with a different
unit. If you have had good results let me know what you changed it out
for. I spoke with Jim Bounds and he strongly suggests the Honda 6410
generator. If some one has one of these guys and would like to part
with it let me know. Thanks for all ideas
Marcel in Sunny and warm New Mexico
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| Re: [GMCnet] Onan repair or replace [message #317394 is a reply to message #317393] |
Thu, 11 May 2017 16:34  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Marcel,
If you don't use the generator a lot, you may want to consider a
"contractor" unit, such as my TroyBilt:
http://www.gmcmhphotos.com/photos/g5330-troybilt-generator-installation.html
The installation wasn't very difficult, even in my space-constrained 23',
and it's worked perfectly. The total cost, including the battery-start
generator, Onan-style muffler, and 12VDC & crankcase-pulsation operated
fuel pumps was only about $800. While it's a little louder than even the
Onan, it's been totally reliable. It starts easily, carries a 5 kW load
without complaint, and hasn't required any service during the 7-1/2 years
it's been installed. I really should change its oil, now that I'm reminded
how long it's been in there!
Ken H.
On Thu, May 11, 2017 at 5:01 PM, Marcel J. Bourgon
wrote:
> Hi all. It would appear the my Onan is biting the dust. The generator
> man and I have had enough of trying to keep the old girl running. I am
> wondering if some of you have changed the old dog with a different unit.
> If you have had good results let me know what you changed it out for. I
> spoke with Jim Bounds and he strongly suggests the Honda 6410 generator.
> If some one has one of these guys and would like to part with it let me
> know. Thanks for all ideas
>
> Marcel in Sunny and warm New Mexico
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Onan repair or replace [message #317399 is a reply to message #317393] |
Thu, 11 May 2017 18:42 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Define "biting the dust"
Basicly 3 systems, the engine (motor), the generator, and the control board and associated wiring.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Onan repair or replace [message #317401 is a reply to message #317399] |
Thu, 11 May 2017 19:09 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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If you can acquire one, the Honda ev6010 fits within the genset compartment of a 26' GMC. You just have to produce a base plate (diagram on bdub site) and an exhaust system (or find a Honda 'B' muffler). Diagram exists to wire the remote start button for the Onan to mate with the Honda ev family.
The Hondas pop up on Craig's list.
Only downside, Honda parts are a bit pricy, but readily available. Service manuals are also on bdub's wonderful site under; "manuals." Honda also runs at 3600 rpm, different noise level than Onan running 1800 rpm.
Tom, MS II with ev6010
"Ask the man who owns one."
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Onan repair or replace [message #317405 is a reply to message #317393] |
Thu, 11 May 2017 19:45 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I couldn't find a troy-bilt so I used the Harbor Freight one, looks to have the same engine as Ken's. It wasn't that noisy, but the Onan >is< quieter. From the outside, the Honda isn't, although I haven't spent any time inside a coach fitted with one. In that it's liquid cooled, it is a lot more complex. Here's the cheap way:
http://www.gmcmhphotos.com/photos/g6827-new-genset.html
That's in a 23'. There's enough room in a 26' to slide mount it. Frankly, I suspect 5000 Troy-Bilt Watts are about the same as 7500 Harbor Freight Watts. The engines look identical. That was simply the smallest electric start Harbor Freight listed. It installs so you can still use the yanker cranker if all the batteries are flat. And, the started pad is on the smaller Harbor Freight units, but you'd have to do some surgery to mount it. It seemed simpler to go with the bigger one. If I did a lot of boondocking, I'd totally rebuild the Onan for about the same or a bit less than buying the Honda. It will run longer and be quieter in the bargain. I put that one in in favor of a Junkerac variable speed set. If the 23' had had a 4KW Onan in it, I'd have rehabbed it. My current 26' coach has a 6KW Onan, it ain't going anywhere. As long as it's fixable it will get fixed. After 40 years it runs like a top, pulls both air conditioners and the water heater and microwave. Your mileage may vary.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Onan repair or replace [message #317406 is a reply to message #317393] |
Thu, 11 May 2017 19:50 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I'll note, had I it to do over - or if I hadn't sold that coach - I'd remote the air filter and put a solenoid with a timer on the choke. I suspect the new owner will address both.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Onan repair or replace [message #317448 is a reply to message #317393] |
Fri, 12 May 2017 11:49 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Jump pin 9 to pin 5 and see if the fuel pump comes on. If so, see if it will crank and run. If it does, the problem is on the control card or its associated connections. Report back. Or download Duane Simmons' troubleshooting file off Bdub's site and it will let you determine the problem.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Onan repair or replace [message #317453 is a reply to message #317448] |
Fri, 12 May 2017 12:38 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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Johnny Bridges wrote on Fri, 12 May 2017 11:49Jump pin 9 to pin 5 and see if the fuel pump comes on. If so, see if it will crank and run. If it does, the problem is on the control card or its associated connections. Report back. Or download Duane Simmons' troubleshooting file off Bdub's site and it will let you determine the problem.
--johnny
Other things can keep it from running even with a good board. If the board is not getting ~28VAC from the flywheel alternator, it assumes the genset is not running and turns off the ignition and fuel pump. A bad flywheel alternator or a bad voltage regulator can cause that. And corroded connections.
If the oil pressure sender is stuck in the "closed" position, that will tell pin 12 that there is no oil pressure, and the board will turn off power to the coil and fuel pump. That is an easy test - disconnect the terminal from pin 12. Don't run it like that forever, replace the sender and reconnect pin 12.
Either of those should still try to run and then die, because the start sequence bypasses those protections temporarily.
Putting a jumper from 5 to 9 basically takes the board out of the equation. That applies battery voltage to the fuel pump, fuel shut-off solenoid, and coil. If no spark with the jumper, suspect bad condenser(s) or coil or points problem. If it has spark and won't fire, suspect the carb.
Also, the fuel solenoid can get glued shut with gas shellac. Same with the fuel pump, shellac can immobilize the piston.
Everything that can go wrong on the Onan engine can be repaired or replaced, except compression. That is probably the kiss of death, unless someone knows where to buy oversized pistons and rings.
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