Home » Public Forums » GMCnet » [GMCnet] Onan 6000 Flywheel
| [GMCnet] Onan 6000 Flywheel [message #130917] |
Sun, 19 June 2011 17:16  |
Glen And Rose
Messages: 36
Registered: June 2011
Karma: 0
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Folks,
I've spent several days cleaning the accumulated oil off of the Onan 6000 so that I can check all of the wiring, shut offs etc., and ultimately sort out why it won't crank from inside the coach. I think I have that all figured out already. But, I'm down to the flywheel and want to pull that so that I can clean behind it. Some of the oil in the hard to reach spaces behind the flywheel has been there long enough to almost be a lacquer. I can build a puller to fit the 4 tapped holes, no problem there and I can reverse that to push it back on very carefully. The center bolt that holds the flywheel to the crank shaft is my concern. Do you turn this CCW or is it CW to remove the bolt.
Glen
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| Re: [GMCnet] Onan 6000 Flywheel [message #130933 is a reply to message #130929] |
Sun, 19 June 2011 18:26  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Glen,
It's been many years since I first pulled the flywheel on my Onan.
When I did, the alternator coil looked as if the only thing insulating
the wires was the oil it was soaked with. So I took it to a motor
rebuilder and had them re-enamel the coil and put new fiberglass
sleeving on the leads.
It made me feel better to put that pretty piece back in place; but,
frankly, it was a total waste of money. When I next removed the
flywheel, most of the enamel had flaked off. The new sleeving was the
only real improvement I'd achieved.
Hopefully yours won't be so oil-soaked, but if it is, be advised that
it's probably not feasible to clean the coil well enough for new
enamel to stick.
Ken H.
On Sun, Jun 19, 2011 at 7:09 PM, Glen And Rose wrote:
> Thanks Rob,
>
> I went out and cranked it a few rev's and saw that the flywheel was going
> CW, so I ultimately made the assumption that CCW or lefty loosy was going
> to do it. I'll let the WD-40 soak until tomorrow and then give it a turn.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Onan 6000 Flywheel [message #130942 is a reply to message #130933] |
Sun, 19 June 2011 19:18 |
Glen And Rose
Messages: 36
Registered: June 2011
Karma: 0
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Hi Ken,
I don't think I'll go that far, I just want the crud off so that I can keep
track of it and see if there is a seal leak or just 36 years of build up. I
did build a puller and an installer, so if someone else needs to do this
same thing, I'll gladly lend them the two items. I took a photo of the
flywheel center, loaded it into the CAD used one measurement to size it and
cut it a few moments later.
Glen
--------------------------------------------------
From: "Ken Henderson" <hend4800@bellsouth.net>
Sent: Sunday, June 19, 2011 4:26 PM
To: <gmclist@temp.gmcnet.org>
Subject: Re: [GMCnet] Onan 6000 Flywheel
> Glen,
>
> It's been many years since I first pulled the flywheel on my Onan.
> When I did, the alternator coil looked as if the only thing insulating
> the wires was the oil it was soaked with. So I took it to a motor
> rebuilder and had them re-enamel the coil and put new fiberglass
> sleeving on the leads.
>
> It made me feel better to put that pretty piece back in place; but,
> frankly, it was a total waste of money. When I next removed the
> flywheel, most of the enamel had flaked off. The new sleeving was the
> only real improvement I'd achieved.
>
> Hopefully yours won't be so oil-soaked, but if it is, be advised that
> it's probably not feasible to clean the coil well enough for new
> enamel to stick.
>
> Ken H.
>
>
>
> On Sun, Jun 19, 2011 at 7:09 PM, Glen And Rose wrote:
>> Thanks Rob,
>>
>> I went out and cranked it a few rev's and saw that the flywheel was going
>> CW, so I ultimately made the assumption that CCW or lefty loosy was
>> going
>> to do it. I'll let the WD-40 soak until tomorrow and then give it a
>> turn.
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| Re: [GMCnet] Onan 6000 Flywheel [message #130952 is a reply to message #130929] |
Sun, 19 June 2011 20:10 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Glen,
You're welcome, I used a 1/2" drive impact wrench on mine and it came off in
an instant.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Glen And Rose
Sent: Monday, June 20, 2011 9:10 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Onan 6000 Flywheel
Thanks Rob,
I went out and cranked it a few rev's and saw that the flywheel was going
CW, so I ultimately made the assumption that CCW or lefty loosy was going
to do it. I'll let the WD-40 soak until tomorrow and then give it a turn.
Glen
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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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| Re: [GMCnet] Onan 6000 Flywheel [message #130953 is a reply to message #130933] |
Sun, 19 June 2011 20:15 |
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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,
What is the function of the alternator coil behind the flywheel? I thought
it was to charge the battery through the regulator on the top of the Onan.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
Sent: Monday, June 20, 2011 9:26 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Onan 6000 Flywheel
Glen,
It's been many years since I first pulled the flywheel on my Onan.
When I did, the alternator coil looked as if the only thing insulating
the wires was the oil it was soaked with. So I took it to a motor
rebuilder and had them re-enamel the coil and put new fiberglass
sleeving on the leads.
It made me feel better to put that pretty piece back in place; but,
frankly, it was a total waste of money. When I next removed the
flywheel, most of the enamel had flaked off. The new sleeving was the
only real improvement I'd achieved.
Hopefully yours won't be so oil-soaked, but if it is, be advised that
it's probably not feasible to clean the coil well enough for new
enamel to stick.
Ken H.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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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| Re: [GMCnet] Onan 6000 Flywheel [message #130965 is a reply to message #130958] |
Sun, 19 June 2011 21:13 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Yea, what Matt said. The 10A charger function is no longer of any
importance to most of us; it's the 26 vac "engine running" signal that
we must have.
The only reason I'm adding to Matt's reply is to advise newbies that
if that function fails, all is not lost, nor is there any good reason
to spend a lot of money having the flywheel alternator rebuilt. You
can simply connect a 120:25.2 (or 24) vac transformer to the 120 vac
output of the generator and connect the secondary in place of the
flywheel alternator. Problem solved.
Since the TroyBilt generator I installed in my GMC had no such
function and I wanted it, I did just that.
Incidentally, I think I've FINALLY gotten that installation to run
reliably. I've been fighting fuel supply problems even though I've
resorted to a crankcase pressure variation operated fuel pump which
won't overpower the float valve as did the electric pumps I tried.
I've been having trouble with the engine dying within a few seconds of
starting easily.
In our 90*F+ heat, we had a power failure a couple of evenings ago.
When SHE reminded me that we couldn't go to the GMC for the night if
the problem persisted, I knew I'd better FIX it! I'd already figured
out that the problem HAD to be in the carburetor, so I pulled and
disassembled it. Almost immediately I spotted the problem: When I
reassembled it a while back after checking whether I could increase
the size of the float, I incorrectly attached the needle valve to the
float.
After assembling the carb correctly, I reassembled the original
plumbing in place of the clear tubing test arrangement I'd been using,
started the generator and ran it with all the load the coach would
provide for about an hour. Not a miss, hesitation, nor falter! Even
in the 90*F ambient, the hottest part of the engine, aside from the
exhaust, only reached 240*F -- which I HOPE is not bad for an air
cooled B&S engine pulling that much load.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Sun, Jun 19, 2011 at 9:49 PM, Matt Colie wrote:
>
>
> Robert Mueller wrote on Sun, 19 June 2011 21:15
>> Ken,
>>
>> What is the function of the alternator coil behind the flywheel? I thought it was to charge the battery through the regulator on the top of the Onan.
>>
>
> More than that Rob,
> It also supplies the "engine running" signal to control circuit and is required even if you have the direct connection to the house bank that that could power ignition. Most later coaches have that (not mine).
>
> Matt
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Onan 6000 Flywheel [message #131073 is a reply to message #130917] |
Mon, 20 June 2011 10:53 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| Glen And Rose wrote on Sun, 19 June 2011 17:16 |
Folks,
I've spent several days cleaning the accumulated oil off of the Onan 6000 so that I can check all of the wiring, shut offs etc., and ultimately sort out why it won't crank from inside the coach. I think I have that all figured out already. But, I'm down to the flywheel and want to pull that so that I can clean behind it. Some of the oil in the hard to reach spaces behind the flywheel has been there long enough to almost be a lacquer. I can build a puller to fit the 4 tapped holes, no problem there and I can reverse that to push it back on very carefully. The center bolt that holds the flywheel to the crank shaft is my concern. Do you turn this CCW or is it CW to remove the bolt.
Glen
_______________________________________________
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Glen,
While you have the Onan dismantled to this point -- you might want to consider adding the Pertronix ignition -- if it does not already have one.
Background -- the original ignition is points/condenser. The points are actuated by a plunger from the camshaft -- the entire assembly wears excessively over time resulting in the timing of the plug firing becoming erratic. The original points are guite difficult to access and set correctly.
Here is a link to one conversion by Ken H.... others are documented on the GMC photo site...
http://www.gmcmhphotos.com/photos/showgallery.php?cat=3608
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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