Home » Public Forums » GMCnet » [GMCnet] Onan 6KW Fly Wheel Removal
| [GMCnet] Onan 6KW Fly Wheel Removal [message #133071] |
Sat, 02 July 2011 01:51  |
Glen And Rose
Messages: 36
Registered: June 2011
Karma: 0
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Well...after a week of replacing the air conditioner on our home, I'm back to the Onan again.
I installed the puller this evening but could not get the flywheel to budge at all. Yes the center bolt has been removed. I did two things, I've liberally applied WD-40 to the back side of the flywheel assuming that after 35 years it is likely on there really well. Then I came in to draft this message inquiring if there is a trick to this. I'll do the tap...tap...tap thing in the morning, but the more important question...am I missing something or just stuck with a stubborn flywheel?
Glen Porter
75 Avion
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| Re: [GMCnet] Onan 6KW Fly Wheel Removal [message #133072 is a reply to message #133071] |
Sat, 02 July 2011 02:01  |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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| Glen And Rose wrote on Fri, 01 July 2011 23:51 |
... I'll do the tap...tap...tap thing in the morning, but the more important question...am I missing something or just stuck with a stubborn flywheel?
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I seem to remember getting the flywheel off without a puller by "tapping" on one side and then the other until the flywheel popped loose. Wasn't MY Onan....
I would loosen the puller, smack one side then the other... rocking it a bit. Then try the puller again.
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: [GMCnet] Onan 6KW Fly Wheel Removal [message #133073 is a reply to message #133071] |
Sat, 02 July 2011 03:16 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Glen,
One of the last things I did to Double Trouble before I returned to Sydney
was to remove the flywheel and get it re-balanced.
I used one of these pullers:
http://www.harborfreight.com/46-piece-bolt-puller-set-37824.html
I tightened the buggery out of puller bolt and then gave it a sharp smack
and the flywheel popped off.
When it popped off I noticed that it's on a taper so I don't know how much
good the WD-40 will do.
Regards,
Rob M.
Sydney, Australia
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: Saturday, 2 July 2011 4:51 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Onan 6KW Fly Wheel Removal
Well...after a week of replacing the air conditioner on our home, I'm back
to the Onan again.
I installed the puller this evening but could not get the flywheel to budge
at all. Yes the center bolt has been removed. I did two things, I've
liberally applied WD-40 to the back side of the flywheel assuming that after
35 years it is likely on there really well. Then I came in to draft this
message inquiring if there is a trick to this. I'll do the tap...tap...tap
thing in the morning, but the more important question...am I missing
something or just stuck with a stubborn flywheel?
Glen Porter
75 Avion
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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 6KW Fly Wheel Removal [message #133076 is a reply to message #133071] |
Sat, 02 July 2011 07:47 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Glen And Rose wrote on Sat, 02 July 2011 02:51 |
Well...after a week of replacing the air conditioner on our home, I'm back to the Onan again.
I installed the puller this evening but could not get the flywheel to budge at all. Yes the center bolt has been removed. I did two things, I've liberally applied WD-40 to the back side of the flywheel assuming that after 35 years it is likely on there really well. Then I came in to draft this message inquiring if there is a trick to this. I'll do the tap...tap...tap thing in the morning, but the more important question...am I missing something or just stuck with a stubborn flywheel?
Glen Porter
75 Avion
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Glen,
The flywheel is on a taper, so I very much doubt that WD-40 will do any good (but it won't hurt).
Please put some bolt (HHCS) back into the end of the crankshaft. You can use the installed part backed out one (1) -Uno -Ichi -Ein Turn Only.
Two reasons:
There is no good bearing surface on the end of the crank and you do not want to chance messing up the crank.
If it comes loose as they usually do, it will come loose with great fervor. This is usually a big bang and a great surprise and you may not be able to catch the piece of iron before damage is done.
I may not seem like it, but you will have used the puller to cock a huge spring. It will liberate all that energy at once when it does come loose.
Sound like experience does it??
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Onan 6KW Fly Wheel Removal [message #133080 is a reply to message #133078] |
Sat, 02 July 2011 09:06 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Glen, The puller has to have a center bolt that bears pressure against the
end of the crankshaft, while being bolted to the flywheel. What I normally
do is to find a hex head bolt that will slip into the threaded portion of
the crank. I then chuck it in a vise and drill a dimple with a 7/16" or so
drill bit into the head of the bolt. Place the bolt in the threaded hole and
the pointed end of the puller bolt will center on the dimple. Be very sure
to fully engage the hold down bolts in the threads in the flywheel as far as
possible. If you only screw them in a thread or two, you run the risk of
pulling the threads out of the flywheel. The puller literally exerts tons of
force onto the assembly with no visible movement, then all of a sudden,
"pop" off it comes. I usually lube the threads on the center bolt and the
sharp point as well. The usual practice is to tighten the center bolt, wait
a few seconds, tighten again as much as you can pull with a box end wrench,
then swat the end of the center bolt with a well placed blow from a quite
heavy hammer. I use a brass one, but a steel machinist hammer will work too.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Sat, Jul 2, 2011 at 6:49 AM, Hardie Johnson <hardie.j@gmail.com> wrote:
>
>
> Glen And Rose wrote on Sat, 02 July 2011 02:51
> > <>I've liberally applied WD-40 to the back side of the flywheel assuming
> that after 35 years it is likely on there really well<>
> > Glen Porter
> > 75 Avion
>
> You have gotten good advice on the removal process. Another way to partly
> retain the flywheel as you try to pull it off is to use a socket head screw
> to protect the end of the shaft and center the puller. Leave it a turn or
> two loose.
> WD-40 is, basically, kerosene. It is not much good for anything but was the
> 40th formulation of a Water Displacement fluid, hence the name.
> For a penetrant, check out Kano Labs Aerokroil at their online store.
> "squeaky wheel gets the grease"
>
> --
> Hardie Johnson "Crashj"
> 1973 26 foot Glacier, White Thing
> Raleigh NC
> _______________________________________________
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| Re: [GMCnet] Onan 6KW Fly Wheel Removal [message #133146 is a reply to message #133071] |
Sat, 02 July 2011 21:26 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Try some PB Blaster or Kriol. Give either a dy or so to soak in, then tap. No success, try gentle application of the Red Wrench to thre metal around the shaft, then tap.
--johnny
--- On Sat, 7/2/11, Glen And Rose <longez102@earthlink.net> wrote:
From: Glen And Rose <longez102@earthlink.net>
Subject: [GMCnet] Onan 6KW Fly Wheel Removal
To: gmclist@temp.gmcnet.org
Date: Saturday, July 2, 2011, 6:51 AM
Well...after a week of replacing the air conditioner on our home, I'm back to the Onan again.
I installed the puller this evening but could not get the flywheel to budge at all. Yes the center bolt has been removed. I did two things, I've liberally applied WD-40 to the back side of the flywheel assuming that after 35 years it is likely on there really well. Then I came in to draft this message inquiring if there is a trick to this. I'll do the tap...tap...tap thing in the morning, but the more important question...am I missing something or just stuck with a stubborn flywheel?
Glen Porter
75 Avion
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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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