Home » Public Forums » GMCnet » [GMCnet] The genset boogie
| [GMCnet] The genset boogie [message #145181] |
Sat, 01 October 2011 18:32  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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My 23 footer has a Junkerac 3.6KW variable speed genset which was installed some years back. It has been doing OK other than the float will stick shut on occasion and need a bit of tapping if it's been sitting a couple of weeks. Now, however, it has a problem. Press the start switch, the cooling fan engages and stays that way until you stop it, and the Run light stays lit. But, fire it off, and when you release the start switch the run light goes out and it stops. If I'm reading the (rather limited) schematic correctly, this is an indication of either a failed oil pressure switch or a failed temp limit switch. I'm betting oil pressure switch beacuse low pressure switches of this type are notoriously unreliable, and temp limit switches seldom give trouble at all (I support a fair number of both). Tomorrow I shall bypass each in turn and see what happens. I'll simply put a guage on the oil port, and assuming it holds some pressure hot,
we'll live without the switch. I suspect it will make an interesting noise if it runs out of oil pressure and self - destructs... and this would give me an excuse to do the Henderson Thing with the contractor genset.
Meantime, I took a gas can out to the parts coach and ran a line to the 6KWOnan pump and stuffed a hot battery in the bay and spun it over. It blew a wad of soot and rust out the pipe, and then settled down to a happy Onan 1800 purrr.. I didn't load it, but I've no reason to think it won't run just fine. I wish it would fit in the shorter coach.
--johnny
'76 Norris 23 upfit
'76 Palm Beach
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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] The genset boogie [message #145189 is a reply to message #145181] |
Sat, 01 October 2011 19:43  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Johnny,
Good luck finding the LOP switch. I never did. With the junk machine on my
custom service stand, the switch was still hidden somewhere under the
incomprehensible sheet metal. I gave up when I recognized what a service
nightmare the thing would always be.
My TroyBilt purrs (albeit loudly).
By the way, are you coming to GMCDL Valdosta next week?
Ken H.
On Sat, Oct 1, 2011 at 7:32 PM, Johnny Bridges <jhbridges@ymail.com> wrote:
> My 23 footer has a Junkerac 3.6KW variable speed genset which was installed
> some years back. It has been doing OK other than the float will stick shut
> on occasion and need a bit of tapping if it's been sitting a couple of
> weeks. Now, however, it has a problem. Press the start switch, the cooling
> fan engages and stays that way until you stop it, and the Run light stays
> lit. But, fire it off, and when you release the start switch the run light
> goes out and it stops. If I'm reading the (rather limited) schematic
> correctly, this is an indication of either a failed oil pressure switch or a
> failed temp limit switch. I'm betting oil pressure switch beacuse low
> pressure switches of this type are notoriously unreliable, and temp limit
> switches seldom give trouble at all (I support a fair number of both).
> Tomorrow I shall bypass each in turn and see what happens. I'll simply put
> a guage on the oil port, and assuming it holds some pressure hot,
> we'll live without the switch. I suspect it will make an interesting
> noise if it runs out of oil pressure and self - destructs... and this would
> give me an excuse to do the Henderson Thing with the contractor genset...
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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] The genset boogie [message #145210 is a reply to message #145189] |
Sat, 01 October 2011 21:50 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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If it isn't readily apparent, the circuit board is... wire removal may be the move. And that allows testing with a multimeter. I can prove it is or isn't the problem.
Valdosta ain't in the cards - wish it was, but I've too much to do to take any time. I've one show coming up, but it's local, they can get me if they need me. Maybe next time...
--johnny
________________________________
From: Ken Henderson <hend4800@bellsouth.net>
To: gmclist@temp.gmcnet.org
Sent: Saturday, October 1, 2011 8:43 PM
Subject: Re: [GMCnet] The genset boogie
Johnny,
Good luck finding the LOP switch. I never did. With the junk machine on my
custom service stand, the switch was still hidden somewhere under the
incomprehensible sheet metal. I gave up when I recognized what a service
nightmare the thing would always be.
My TroyBilt purrs (albeit loudly).
By the way, are you coming to GMCDL Valdosta next week?
Ken H.
On Sat, Oct 1, 2011 at 7:32 PM, Johnny Bridges <jhbridges@ymail.com> wrote:
> My 23 footer has a Junkerac 3.6KW variable speed genset which was installed
> some years back. It has been doing OK other than the float will stick shut
> on occasion and need a bit of tapping if it's been sitting a couple of
> weeks. Now, however, it has a problem. Press the start switch, the cooling
> fan engages and stays that way until you stop it, and the Run light stays
> lit. But, fire it off, and when you release the start switch the run light
> goes out and it stops. If I'm reading the (rather limited) schematic
> correctly, this is an indication of either a failed oil pressure switch or a
> failed temp limit switch. I'm betting oil pressure switch beacuse low
> pressure switches of this type are notoriously unreliable, and temp limit
> switches seldom give trouble at all (I support a fair number of both).
> Tomorrow I shall bypass each in turn and see what happens. I'll simply put
> a guage on the oil port, and assuming it holds some pressure hot,
> we'll live without the switch. I suspect it will make an interesting
> noise if it runs out of oil pressure and self - destructs... and this would
> give me an excuse to do the Henderson Thing with the contractor genset...
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_______________________________________________
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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] The genset boogie [message #145934 is a reply to message #145210] |
Sat, 08 October 2011 17:44 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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So. I tried the Ken Henderson Search, with the same results. Then I figured Applied Logic might be the move. Some poking about the harness showed a set of wires headed over to the choke assembly. Off with the Choke! Sure enough, three of the four went to the choke - common, coil, and heater. Fourth plugged into a wire disappearing down the side of the crankcase. So I unplugged it. Viola, sort of. The genset now cranks and runs properly, takes load and is generally happy. However, the 'run' light on the remote no longer illuminates, and the generator bay fan - which is run by the light - no longer operates. So the current question is, did I bust the 'run' light wire poking around, or does the set actually look for a closed oil switch at startup? All the service manual nots is, there's a time delay before the safety can stop the engine. Some testing tomorrow will tell which is the case, and the fan will operate as designed.
Now, some may say - you're running the genset without engine safties. True dat. However, If I pull the thing out of the coach, it ain't going back. If it loses pressure or overheats and thereby ascends to Generator Valhalla, so what. The Generac Service Manual covers several of the variable speed sets, so it's sort of generic here and there. It does point out, however, that the initial 10PSI oil switch should be replaced with the new and improved 5 PSI unit; and the initial 263 degree temp safety should be replaced with the new and improved 295 degree unit. Go figure.
Anybody wants the manual, it's 94468A. I have it as a .pdf.
--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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