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01-06-2018, 12:42 PM
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#1
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Senior Member
Join Date: Jul 2016
Posts: 691
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Onan 7.5 glow plugs installation
Hello all,
Our Onan 7.5 HDKAJ11451H diesel genny has never started all that great in cool weather and seems to be getting worse. It is 5C/41F here today. I tried starting it but no go. I didn't crank it too long or too many times for fear of draining the batteries but It always fires up in warm weather.
I tried 3 cycles of preheat starting but didn't even fire.
I would like to try changing the glow plugs. Are they easily accessed and changed?
Would anyone have a part number?
I'm betting the OEM glow plugs are expensive...is there an NGK plug part number that would work?
Thanks in advance for any advice
Irishguy
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01-06-2018, 01:35 PM
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#2
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Senior Member
Join Date: May 2014
Posts: 868
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The glow plugs are easy to change. Check them out with an ohm meter as you want to
make sure that it is the glow plugs that are shot. It could be that you aren't getting any
current to the plugs. I think you can get plugs through Amazon. My generator takes less
revolutions when its cold out then when its 80 out. I have started mine at -5 F, it takes
17 seconds on the plugs and the starts immediately.
__________________
Peter
36 ft. 99 U320 foretravel 36 ft. 98 Dynasty
98 Suzuki Sidekick Sport 4 door
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01-06-2018, 02:55 PM
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#3
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,780
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Maybe you're not preheating/priming it long enough. When it's cold and/or I haven't run it for a while, I hold down the bottom of the switch for 60 seconds. Then when I press the top there is a steady amber light for about ten seconds or so, then it starts immediately. It is not trying to crank during the 10 seconds I am holding the top down.
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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01-06-2018, 03:01 PM
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#4
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Senior Member
Join Date: Jun 2012
Location: NorCal
Posts: 3,000
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I have noticed mine will start faster when I haven't used it for long periods of time when I use the switch at the generator, not sure if that is due to getting a hotter feed due to shorter wire run.
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Outbound
2002 Monaco Executive 500 ISM
2004 GMC 2500HD 4X4
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01-06-2018, 06:00 PM
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#5
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Senior Member
Join Date: May 2014
Posts: 868
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When I start my generator I hold the start button until it starts. Depending how cold it
is, is what takes how long the glow plugs are being heated until the generator turns
over. I'm sure your glow plugs aren't working. Your just want to find out for sure if it is
the glow plugs that are shot and it's not the wiring. I would be it is the plugs but make sure.
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Peter
36 ft. 99 U320 foretravel 36 ft. 98 Dynasty
98 Suzuki Sidekick Sport 4 door
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01-06-2018, 06:10 PM
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#6
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Senior Member
American Coach Owners Club
Join Date: Jan 2011
Posts: 2,742
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Glow Plugs seldom go away! They are used initially to Start. That being said in the warmer months they need a shorter charge and in Winter months much longer to fire off Cold Diesel ! Keep trying and I'll bet it fires off .
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Chuck
Brownsburg Indiana
1992 American Eagle-8.3C-450hp
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01-06-2018, 08:06 PM
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#7
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Senior Member
Join Date: Jul 2016
Posts: 691
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Quote:
Originally Posted by MSHappyCampers
Maybe you're not preheating/priming it long enough. When it's cold and/or I haven't run it for a while, I hold down the bottom of the switch for 60 seconds. Then when I press the top there is a steady amber light for about ten seconds or so, then it starts immediately. It is not trying to crank during the 10 seconds I am holding the top down.
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Hello Joe, I pushed the switch down to prime for a minute then I hold the start button down until it's about to start then let go...I do that 3 times to get the glow plugs hot. That usually works when it is cold out but not today.
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01-06-2018, 08:09 PM
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#8
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Senior Member
Join Date: Jul 2016
Posts: 691
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Quote:
Originally Posted by Outbound
I have noticed mine will start faster when I haven't used it for long periods of time when I use the switch at the generator, not sure if that is due to getting a hotter feed due to shorter wire run.
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That's not a bad idea...I usually start with the dash starter so will try the switch on the genny.
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01-06-2018, 08:10 PM
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#9
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Senior Member
Join Date: Jul 2016
Posts: 691
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Quote:
Originally Posted by oldguy70
The glow plugs are easy to change. Check them out with an ohm meter as you want to
make sure that it is the glow plugs that are shot. It could be that you aren't getting any
current to the plugs. I think you can get plugs through Amazon. My generator takes less
revolutions when its cold out then when its 80 out. I have started mine at -5 F, it takes
17 seconds on the plugs and the starts immediately.
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Can you get to them through the top access cover?
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01-06-2018, 08:12 PM
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#10
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Senior Member
Join Date: Jul 2016
Posts: 691
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Quote:
Originally Posted by NHRA225
Glow Plugs seldom go away! They are used initially to Start. That being said in the warmer months they need a shorter charge and in Winter months much longer to fire off Cold Diesel ! Keep trying and I'll bet it fires off .
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I'm going to try again but just worried too much cranking will kill the batteries or wreck the starter.
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01-06-2018, 08:13 PM
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#11
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Senior Member
Join Date: Jul 2016
Posts: 691
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Quote:
Originally Posted by oldguy70
When I start my generator I hold the start button until it starts. Depending how cold it
is, is what takes how long the glow plugs are being heated until the generator turns
over. I'm sure your glow plugs aren't working. Your just want to find out for sure if it is
the glow plugs that are shot and it's not the wiring. I would be it is the plugs but make sure.
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Hopefully it is just the glow plugs as it sounds like they are easy to change.
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01-07-2018, 06:41 AM
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#12
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Member
Join Date: Oct 2014
Location: Thunder Bay ON
Posts: 54
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Had the same problem, there are three fuses under the access panel of the generator. One fuse 25 amp is for the glow plugs, if this fuse is blown the glow plugs won't heat...
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Carol and Bernie with Casey (Chihuahua), Finnegan (Chug) Peanut (chihuahua)
2004 HR Imperial PST40 Cummins 400hp ISL
2010 Suzuki Grand Vitara
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01-07-2018, 07:46 AM
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#13
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Senior Member
Join Date: Jun 2011
Location: FL
Posts: 11,451
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Quote:
Originally Posted by Eagles16
Had the same problem, there are three fuses under the access panel of the generator. One fuse 25 amp is for the glow plugs, if this fuse is blown the glow plugs won't heat...
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Ditto:
I can't seem to find where I bought glow plugs for mine.
I got them for around $10 each.
__________________
Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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01-07-2018, 09:01 AM
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#14
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Senior Member
Monaco Owners Club Vintage RV Owners Club Holiday Rambler Owners Club
Join Date: Jul 2012
Location: Lexington, SC
Posts: 2,820
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Attached is the parts manual for your generator which says your glow plugs are part# 185-5421 (page 16)
__________________
Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
Towing 2014 Ford Explorer
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