| Onan Starter Moror Questions [message #234477] |
Mon, 30 December 2013 17:49  |
Steve
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
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The starter on my Onan is doing strange things. Once I hit the start button, the starter engages the flywheel turns the motor over. The problem is that it does not always disengage. If the Onan fails to start, it just keeps cranking until I disconnect a battery cable. Sometimes when the Onan starts the starter motor still stays engaged with the flywheel and I cannot shut it down or get it to disengage unless I disconnect a battery cable.
I know I will need to go through the test procedures to see if it is circuit board related. Maybe the switch or other component on the board is malfunctioning?
My hunch is that it is the actual starter motor that is getting hung up and is not releasing?
I am also wondering about the starter motor bracket. If that is cracked or bent could it cause the starter to be miss-aligned and hang up on the flywheel?
I looked at the bracket about a month ago and at first glance it seems that it is mounted between the motor and the generator. Do you have to separate them to install the new and improved heavy duty steel alternator bracket? I would think it would be an easy install but not sure?
Any thoughts before I work on this tomorrow?
1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
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| Re: [GMCnet] Onan Starter Moror Questions [message #234483 is a reply to message #234477] |
Mon, 30 December 2013 18:07  |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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Senior Member |
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On Dec 30, 2013, at 6:49 PM, Steve Adams wrote:
> The starter on my Onan is doing strange things. Once I hit the start button, the starter engages the flywheel turns the motor over. The problem is that it does not always disengage.
Its easy enough to determine if it is the control board holding the solenoid engaged..when the unit demonstrates the bad behavior just yank the low-current wire off the starter solenoid. If the bendix immediately disengages then that would be a good indication that it is the control board at fault. If it stays engaged with the flywheel then you can go after something mechanical instead.
Defective control boards can act up in all sorts of ways. I have seen a bad control board start cranking an onan on its own..at random. I was out in my driveway one day and heard my onan cranking with no one around... so I installed in a dinosaur board and it never acted up again...
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Onan Starter Moror Questions [message #234486 is a reply to message #234477] |
Mon, 30 December 2013 18:17 |
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Mine did that years ago. It was caused by the broken starter bracket being
broken. I traced around it over a piece of 3/8" plate and cut it out with a
torch. Cleaned it up, drilled mounting holes, ... been that way for ...
wow!, 12 years or so!
Applied GMC would be your best bet though. Jim has 'em in stock.
bdub
-----Original Message-----
From: On Behalf Of Steve Adams
Sent: Monday, December 30, 2013 5:50 PM
The starter on my Onan is doing strange things. Once I hit the start
button, the starter engages the flywheel turns the motor over. The problem
is that it does not always disengage. If the Onan fails to start, it just
keeps cranking until I disconnect a battery cable. Sometimes when the Onan
starts the starter motor still stays engaged with the flywheel and I cannot
shut it down or get it to disengage unless I disconnect a battery cable.
I know I will need to go through the test procedures to see if it is circuit
board related. Maybe the switch or other component on the board is
malfunctioning?
My hunch is that it is the actual starter motor that is getting hung up and
is not releasing?
I am also wondering about the starter motor bracket. If that is cracked or
bent could it cause the starter to be miss-aligned and hang up on the
flywheel?
I looked at the bracket about a month ago and at first glance it seems that
it is mounted between the motor and the generator. Do you have to separate
them to install the new and improved heavy duty steel alternator bracket? I
would think it would be an easy install but not sure?
Any thoughts before I work on this tomorrow?
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
bdub
bdub.net
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| Re: Onan Starter Moror Questions [message #234497 is a reply to message #234477] |
Mon, 30 December 2013 19:26 |
Steve
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
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Senior Member |
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Jim,
Good idea on pulling the low voltage wire off the starter solenoid. I will try that in the morning. If that stops the cranking then we know the board is acting up.
1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
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| Re: Onan Starter Moror Questions [message #234637 is a reply to message #234497] |
Tue, 31 December 2013 19:49 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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If you find the bracket cracked or broken check the Onan rubber isolation mounts. If hanging low it can bang the starter against the metal floor of the Onan enclosure and break the starter mount.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: Onan Starter Moror Questions [message #234649 is a reply to message #234477] |
Tue, 31 December 2013 21:23 |
Steve
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
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Senior Member |
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Larry,
Was the new bracket difficult to install?
1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
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