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  #11  
Old 09-19-2011
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markbragdon markbragdon is offline
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Default Here we go again!

My ONAN 8kw started fine and ran for a while after a complete revamping of the gennie compartment. While I was trying to get the air purged from the cooling system, it shutdown on overheat (as evidenced by the gauge in the coach). Didn't feel TOO hot to me. The start/stop solenoid will not stay engaged even though it worked fine the first time. It is still not working although if I hold the start solenoid open it will work for a while, then shutdown on it's own. I am able to hold my hand on the thermostat housing, so I know it is not too hot. Checked all the grounds (again!). Pulled the temp sensor, found 3 ohms (do not know if it is NO/NC type). Does the ignition key in the coach need to be on in order to refresh the gauge numbers? Any more thoughts?
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Mark and Donna Bragdon
CW4 retired
Windham, Maine
87 FC SOLD
89 SP SOLD
94 WB SOLD
95 WB 42
2007 Jeep Wrangler
2015 GMC Acadia
207-939-3816
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  #12  
Old 09-19-2011
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giderich giderich is offline
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Quote:
Originally Posted by markbragdon View Post
My ONAN 8kw started fine and ran for a while after a complete revamping of the gennie compartment. While I was trying to get the air purged from the cooling system, it shutdown on overheat (as evidenced by the gauge in the coach). Didn't feel TOO hot to me. The start/stop solenoid will not stay engaged even though it worked fine the first time. It is still not working although if I hold the start solenoid open it will work for a while, then shutdown on it's own. I am able to hold my hand on the thermostat housing, so I know it is not too hot. Checked all the grounds (again!). Pulled the temp sensor, found 3 ohms (do not know if it is NO/NC type). Does the ignition key in the coach need to be on in order to refresh the gauge numbers? Any more thoughts?
Mark, cycle the DC Control brkr, on and off (on front of the DC control box). If that switch is turned off the gauges may be pegged or resting on zero.

The fault breaker (bottom breaker with the small round button) has a wire coming out the back side; this wire connects to a lug on the edge of the printed circuit board. When the fault breaker is energized (not tripped) the wire attached to the circuit board supplies 12 volts to the shut-off solenoid.

I stumbled across a similar condition as yours when I replaced the broken plastic fault breaker with a new one lacking the wire going to the printed circuit board...same deal, the shut-off solenoid would not stay open. Reinstalled the old fault breaker with the wire (used super glue to repair broker off snout) and the generator now starts and continues running.

The ignition key in the coach does not affect the gen gauges on my coach.
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Dick & Patsy Gideon
1999 43 LXI Single Slide Body # F124510
2005 JEEP Liberty Limited CRD (diesel Toad)
SOLD 89 FC in 2012; SOLD 88 WB in 2016
Rolla, MO 65401

Last edited by giderich; 09-19-2011 at 10:17 PM. Reason: added last sentence
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  #13  
Old 09-19-2011
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Thanks, Dick. I will try that first thing in the morning.
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Mark and Donna Bragdon
CW4 retired
Windham, Maine
87 FC SOLD
89 SP SOLD
94 WB SOLD
95 WB 42
2007 Jeep Wrangler
2015 GMC Acadia
207-939-3816
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  #14  
Old 09-20-2011
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the wires attached to those four switches & breakers are fragile & vibrate loose or break easily, recheck all the connections,
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  #15  
Old 09-20-2011
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Default Hi Bill

Thanks for the the tip. I will try that as well as soon as it stops raining. The recycling of the breakers did not work. I did notice that I cannot hear the clicking of the facet pump on the ONAN and I did before I had this problem. Bob Janes had a thread in '09 that said the push button fault breaker was shorting. The ONAN does seem to run (poorly) without the pump working.
On another subject, I was able to get a custom bent SS 1 1/2" tailpipe that exits above the goat rail for $101.00. Great people! I even have a 7' piece left over.
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Mark and Donna Bragdon
CW4 retired
Windham, Maine
87 FC SOLD
89 SP SOLD
94 WB SOLD
95 WB 42
2007 Jeep Wrangler
2015 GMC Acadia
207-939-3816
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  #16  
Old 09-20-2011
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markbragdon markbragdon is offline
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Default Eureka!

It was the push button fault breaker. Even though the button had not popped out, all it took was recycling the button! Thanks to Dick, Bill, and Bob Janes. Now I just have to get all the air from the cooling system and install the exhaust pipe and it is finished. Thanks to all!
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Mark and Donna Bragdon
CW4 retired
Windham, Maine
87 FC SOLD
89 SP SOLD
94 WB SOLD
95 WB 42
2007 Jeep Wrangler
2015 GMC Acadia
207-939-3816
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  #17  
Old 09-20-2011
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[QUOTE=markbragdon;128199]It was the push button fault breaker. Even though the button had not popped out, all it took was recycling the button! Thanks to Dick, Bill, and Bob Janes. Now I just have to get all the air from the cooling system and install the exhaust pipe and it is finished. Thanks to all![/QUOTE

That is a great feeling, especially when it was running good before the upgrades & full maintenance.
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1988 FC, Silver Edition
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  #18  
Old 09-20-2011
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Yes indeed. Thanks for your help
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Mark and Donna Bragdon
CW4 retired
Windham, Maine
87 FC SOLD
89 SP SOLD
94 WB SOLD
95 WB 42
2007 Jeep Wrangler
2015 GMC Acadia
207-939-3816
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  #19  
Old 09-20-2011
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giderich giderich is offline
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Mark, I've also recently worked on our Onan DKD...radiator to shop for rehab, new breakers in the DC control box; 'jumped' one more wire on the Cannon plug.

Evacuating the air from the system is somewhat difficult and hit & miss.

The water temp sensor between the thermostat and the water pump can be removed to bleed some air. Also opening the block drain valve on side of the Kubota engine block may eliminate some air. Try squeezing the hoses (milking) and you may eliminate an air bubble or air lock. Keep a close eye on the engine temps until you have operated the genny through a few heating and cooling cycles. The electronic temp gun from Harbor Freight is a good tool for monitoring the engine when you first start the unit. Just a few of my thoughts on the subject...purging the Onan cooling system is not for sissies!

Glad the fault breaker was at fault.
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Dick & Patsy Gideon
1999 43 LXI Single Slide Body # F124510
2005 JEEP Liberty Limited CRD (diesel Toad)
SOLD 89 FC in 2012; SOLD 88 WB in 2016
Rolla, MO 65401

Last edited by giderich; 09-20-2011 at 06:43 PM. Reason: fixd spellin
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  #20  
Old 09-20-2011
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Thanks Dick. I am working through this slowly. The temps on the inside gauge are staying about 210*f or so. I can feel heat in both hoses on the side of the radiator. I do feel (much too late) that I should have oriented the Y-shaped 1" connector differently. I don't know how the air can escape without some sort of an air bleeder system. My return to the expansion tank actually runs down hill. I would hate to have drop the gennie again after just getting it back in.
__________________
Mark and Donna Bragdon
CW4 retired
Windham, Maine
87 FC SOLD
89 SP SOLD
94 WB SOLD
95 WB 42
2007 Jeep Wrangler
2015 GMC Acadia
207-939-3816
Reply With Quote
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