| Lubricant for Onan choke?? [message #329936] |
Tue, 13 March 2018 14:05  |
rjw
Messages: 697
Registered: September 2005
Karma: 4
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Senior Member |
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The choke on my Onan is basically seized up. I can only move it by hand (very stiff) which is impractical for starting. I am looking for something to lubricate it considering the high temperature environment where lives. Any suggestions?
Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com
Roller Cam 455, TBI+EBL, 3.42 FD, 4 Bag, Macerator, Lenzi (brakes, vacuum system, front end stuff), Manny Tranny, vacuum step, Tankless + OEM water heaters.
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| Re: [GMCnet] Lubricant for Onan choke?? [message #329939 is a reply to message #329937] |
Tue, 13 March 2018 14:42  |
77Royale
Messages: 461
Registered: June 2014
Location: Mid Michigan
Karma: 6
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Id try to get it moving free with ATF/Acetone. Clean it all up as best you can, spray it all down the brake cleaner, and then lubricate it with silicone or something like that, that wont collect dirt and grime.
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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| Re: [GMCnet] Lubricant for Onan choke?? [message #329947 is a reply to message #329936] |
Tue, 13 March 2018 18:07 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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On Mar 13, 2018, at 3:05 PM, RJW wrote:
> The choke on my Onan is basically seized up. I can only move it by hand (very stiff) which is impractical for starting. I am looking for something to lubricate it considering the high temperature environment where lives. Any suggestions?
Are you referring to the thermoelectric choke mounted on the exhaust manifold - or are you referring to the choke shaft in the carb?
If the former - no lube. If it is difficult to move then there’s probably something broken inside.
If the latter - there may be some varnish around the lower portion of the shaft, check to make sure that is clean. Other than that any lube is fine for the shaft if it really needs it.
FWIW I’ve never seen any choke parts that needed lubed on any of the Onans that I’ve worked on.
—Jim
Jim Miller
1977 Eleganza
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: Lubricant for Onan choke?? [message #329948 is a reply to message #329936] |
Tue, 13 March 2018 18:32 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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There is an electromagnet in the housing. This has enameled wire windings. Don't use any solvent which could melt the enamel and cause them to short to each other. There is also a bimetallic spring which defeats the action when hot and cranking.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Lubricant for Onan choke?? [message #329964 is a reply to message #329947] |
Wed, 14 March 2018 07:12 |
rjw
Messages: 697
Registered: September 2005
Karma: 4
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Senior Member |
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Jim Miller wrote on Tue, 13 March 2018 19:07On Mar 13, 2018, at 3:05 PM, RJW wrote:
> The choke on my Onan is basically seized up. I can only move it by hand (very stiff) which is impractical for starting. I am looking for something to lubricate it considering the high temperature environment where lives. Any suggestions?
Are you referring to the thermoelectric choke mounted on the exhaust manifold - or are you referring to the choke shaft in the carb?
If the former - no lube. If it is difficult to move then there's probably something broken inside.
If the latter - there may be some varnish around the lower portion of the shaft, check to make sure that is clean. Other than that any lube is fine for the shaft if it really needs it.
FWIW I've never seen any choke parts that needed lubed on any of the Onans that I've worked on.
--Jim
It is the "thermoelectric choke mounted on the exhaust manifold" that seems to be seized. Best bet now it seems will be to remove it and see what is going on inside. Onan starts and runs. Its been that way for years.
Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com
Roller Cam 455, TBI+EBL, 3.42 FD, 4 Bag, Macerator, Lenzi (brakes, vacuum system, front end stuff), Manny Tranny, vacuum step, Tankless + OEM water heaters.
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| Re: Lubricant for Onan choke?? [message #329995 is a reply to message #329936] |
Wed, 14 March 2018 20:00 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Instead of trying to move it, first slide the set out where you can see it. Start it and watch the choke. Report back.
--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: Lubricant for Onan choke?? [message #330053 is a reply to message #329995] |
Fri, 16 March 2018 08:37 |
rjw
Messages: 697
Registered: September 2005
Karma: 4
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Senior Member |
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Johnny Bridges wrote on Wed, 14 March 2018 21:00Instead of trying to move it, first slide the set out where you can see it. Start it and watch the choke. Report back.
--johnny
It only moves, if I move it during starting.
Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com
Roller Cam 455, TBI+EBL, 3.42 FD, 4 Bag, Macerator, Lenzi (brakes, vacuum system, front end stuff), Manny Tranny, vacuum step, Tankless + OEM water heaters.
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| Re: Lubricant for Onan choke?? [message #330055 is a reply to message #329936] |
Fri, 16 March 2018 09:03 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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If external light lube does not help, take wire off choke and meter choke screw to ground You should have some low number not open or shorted. The ground connection have been known to be bad as well on crusty manifold. See if metering to can or block is different to troubleshoot. Also confirm you have 12V at chick when cranking. If all this is good you need to remove can and check internal spring on choke unit. The electrical part always tries to choke when cranking, but has to go throught the bimetallic to work so it is defeated hot.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Lubricant for Onan choke?? [message #330061 is a reply to message #329939] |
Fri, 16 March 2018 10:48 |
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Hardie Johnson
Messages: 483
Registered: January 2004
Location: Raleigh NC
Karma: 0
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I have recently discovered one good for places where you do not want to attract dust and grime. Garage door track lubricant was suggested by the mechanic who installed my new door. Any big box store should have it.
If you don't want to make your own penetrant, Kroil is the best I've found, available online. WD-40 is just kerosene.
Hardie Johnson "Crashj"
1973 26 foot Glacier, White Thing
Raleigh NC
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