| [GMCnet] Accessing Old Style Onan Points and Governor Question [message #88064] |
Fri, 11 June 2010 11:57  |
Alan LaVoisne
Messages: 51
Registered: September 2009
Location: Ortonville, MI
Karma: 0
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Hi GMC'ers,
I have been having great fun trying to get my Onan tuned up. At first it
would not start (coach sat for 10 years at least mostly indoors). We took
the fuel pump and fuel solenoid apart and cleaned them up real good. The
little check valve in the fuel pump was stuck. The thing is pumping fuel
like a tanker truck now. It was pumping so well, I found a leak in the fuel
line from the pump to the carb. A new line fixed that. It was running
fairly well at idle but not very well under load. We cleaned the carburetor
and had running pretty well under load for about 4 hours then it would start
to hunt every once in a while. Once I get it running again (lost spark, see
below), I am going to try to lesson the sensitivity on the governor and see
what happens. It is at the most sensitive setting right now.
The spark plugs and the points were all sooted up. So we cleaned them up
and lost spark. I am considering going to solid state ignition from Jim K,
but I think we are going to give a little more effort into getting the
points working again. We used a point file on them and got a inconsistent
spark back. So I am thinking we can do some work on cleaning and see what
happens. The problem is I have the old style points so it is very hard to
get in there to see, so we can clean the points and set the gap. Is there
any trick to this or is it pretty much get in there and do it?
Also, right now the governor has the carb set at full throttle. I read in
the book that the engine starts in this setting, but I have never noticed
this before. Is this correct? I assume once the engine starts, the
governor will back off the throttle?
Thanks all. You are a great help.
Alan LaVoisne
75 Glenbrook
Ortonville, MI
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1975 26' Glenbrook
Mostly Original
Ortonville, MI
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| Re: [GMCnet] Accessing Old Style Onan Points and Governor Question [message #88084 is a reply to message #88067] |
Fri, 11 June 2010 15:01  |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Ill second Ken on that one--it is the most significant improvement you can make. Almost second in line is to remove the heads and decarbonize them. may of us have been shocked at how big a difference that makes in smooth operation. It's a quick and simple job.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Accessing Old Style Onan Points and Governor Question [message #88098 is a reply to message #88090] |
Fri, 11 June 2010 16:36 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Robert Mueller wrote on Fri, 11 June 2010 16:09 |
Bob,
And I'll second you!
Whoever designed the old / early style points on the Onan must have been
asleep in class when "designing for maintenance" was discussed! I got a late
style set to install as a backup to the Pertronix ignition I installed.
I checked Maintenance Manual X-7525 General Information - Maintenance and
24C Onan Motor Generator Sections and there aren't any references to
decarbonizing or cleaning the heads. Any suggestions as to an hour interval?
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Bob de Kruyff
Ill second Ken on that one--it is the most significant improvement you can
make. Almost second in line is to remove the heads and decarbonize them. may
of us have been shocked at how big a difference that makes in smooth
operation. It's a quick and simple job.
--
Bob de Kruyff
78 Eleganza
Chandler, AZ
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The label on the ONAN engine says to do it every 200 hours.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Accessing Old Style Onan Points and Governor Question [message #88099 is a reply to message #88098] |
Fri, 11 June 2010 16:58 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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I've only done it once so I have no idea how long it ran before. frankly, it didn't look too bad, but I was atonished at the difference. I think it was Ken B that got me on that in the first place. i didn't have a spare set of head gaskets but didn't need them since they came off clean and am sure they will again.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Accessing Old Style Onan Points and Governor Question [message #88160 is a reply to message #88134] |
Sat, 12 June 2010 00:32 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Robert Mueller wrote on Fri, 11 June 2010 20:18 |
Ken,
THANKS A LOT! - Another bloody thing added to already too long TTD list!
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Ken Burton
The label on the ONAN engine says to do it every 200 hours.
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We can do it in about 45 minutes if you stop by again this summer. There is a bead blaster in Louie's hanger which is two rows over from the one where you stayed last year.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Accessing Old Style Onan Points and Governor Question [message #88172 is a reply to message #88169] |
Sat, 12 June 2010 03:11 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
Thanks,
We probably wouldn't be there until just before the Du Quoin Convention.
Regards,
Rob
-----Original Message-----
From: Ken Burton
You know where the parking place, Power and key are located.
Help yourself if I am out of town and I'll call Louie to get him to bead
blast them for you. I most likely will be here unless you decide to stop by
while I'm in Manitoba this summer.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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