Home » Public Forums » GMCnet » [GMCnet] Onan Cooling Fan Balancing
| [GMCnet] Onan Cooling Fan Balancing [message #83848] |
Sun, 09 May 2010 22:21  |
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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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G’day,
To smooth out the Onan in Double Trouble I want to have the cooling fan
balanced. I would guess that it would have been balanced as a stand alone
assembly and not connected to the crankshaft.
Whaaadaaaayaaaa think?
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
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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 Cooling Fan Balancing [message #83881 is a reply to message #83848] |
Mon, 10 May 2010 03:12  |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Rob,
Look for small, clip on weights on the vanes. That's how those types
of rotating assys were balanced. Unless you know if the Onan is
internally or externally balanced, I wouldn't fool with it.
On Sun, May 9, 2010 at 8:21 PM, Rob Mueller <robmueller@iinet.net.au> wrote:
> G’day,
>
> To smooth out the Onan in Double Trouble I want to have the cooling fan
> balanced. I would guess that it would have been balanced as a stand alone
> assembly and not connected to the crankshaft.
>
> Whaaadaaaayaaaa think?
>
> Regards,
> Rob Mueller
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] Onan Cooling Fan Balancing [message #83882 is a reply to message #83881] |
Mon, 10 May 2010 03:36 |
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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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Steve,
I don't remember seeing any clip on weights on the fan when John Sharpe and
I installed the Pertronix, maybe that's the problem!
Regards,
Rob Mueller
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 Steven Ferguson
Sent: Monday, 10 May 2010 6:13 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Onan Cooling Fan Balancing
Rob,
Look for small, clip on weights on the vanes. That's how those types
of rotating assys were balanced. Unless you know if the Onan is
internally or externally balanced, I wouldn't fool with it.
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription 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 Cooling Fan Balancing [message #83920 is a reply to message #83848] |
Mon, 10 May 2010 10:05 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
Karma: 0
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Senior Member |
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Rob wrote,
>To smooth out the Onan in Double Trouble I want to have the cooling
> fan balanced.
Rob, unless something bad happened to your fan, I'm thinking at 1,800 rpm there is not a lot to be gained there. Pulleys/fans on cars at 3x the speed typically are net built and not balanced. My vote would be to invest that time and energy in a 6 pack of Foster's.
Craig Lechowicz
'77 Kingsley, Waterford, MI
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| Re: [GMCnet] Onan Cooling Fan Balancing [message #84022 is a reply to message #83920] |
Mon, 10 May 2010 22:20 |
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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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Craig et al,
The first Pertronix unit John Sharpe and I installed on Double Trouble we
set as per the instructions (0.030 from the magnet). It got clobbered by the
fins of the cooling fan. I SWEAR that I turned the fan over and checked the
clearance between the pickup and each blade one by one before we started it.
It ran fine but hiccupped when I switched the circuit breaker on the Onan
on. When it hiccupped something must have shifted as that's when the pickup
got smacked. When we installed the second Pertronix we set the clearance to
the magnet at 0.060 and it worked fine. As a precaution I did the fan blade
clearance check again and noticed a few of the fan fins were closer than the
others so I used a flap wheel to take a bit off them. Being the anally
retentive perfectionist that I am I wanted to have it re-balanced.
NOBODY in Australia drinks Fosters! It's exported. Here's a link to their
website:
http://www.fosters.com.au/enjoy/beer.htm
Note in the paragraph below the bottles it reads "like Australia's favourite
beer, Victoria Bitter."
Regards,
Rob Mueller
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 Craig Lechowicz
Sent: Tuesday, 11 May 2010 1:06 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Onan Cooling Fan Balancing
Rob wrote,
>To smooth out the Onan in Double Trouble I want to have the cooling
> fan balanced.
Rob, unless something bad happened to your fan, I'm thinking at 1,800 rpm
there is not a lot to be gained there. Pulleys/fans on cars at 3x the speed
typically are net built and not balanced. My vote would be to invest that
time and energy in a 6 pack of Foster's.
--
Craig Lechowicz
'77 Kingsley, Waterford, MI
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
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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 Cooling Fan Balancing [message #84036 is a reply to message #84022] |
Tue, 11 May 2010 05:38 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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When I mounted my magnet I made it flush with the edge of the fin of the flywheel. Then I checked that the flywheel cleared the pickup on all of the fins all the way around.
On Dan's we mounted the magnet in the fin but it stuck up slightly higher than the edge of the fin. This made it higher than any of the other fins all the way around and eliminates any potential problem with higher fins.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Onan Cooling Fan Balancing [message #84042 is a reply to message #84022] |
Tue, 11 May 2010 07:33 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Victoria Bitter used to be my favorite.
On Mon, May 10, 2010 at 8:20 PM, Rob Mueller <robmueller@iinet.net.au> wrote:
> Craig et al,
>
> The first Pertronix unit John Sharpe and I installed on Double Trouble we
> set as per the instructions (0.030 from the magnet). It got clobbered by the
> fins of the cooling fan. I SWEAR that I turned the fan over and checked the
> clearance between the pickup and each blade one by one before we started it.
> It ran fine but hiccupped when I switched the circuit breaker on the Onan
> on. When it hiccupped something must have shifted as that's when the pickup
> got smacked. When we installed the second Pertronix we set the clearance to
> the magnet at 0.060 and it worked fine. As a precaution I did the fan blade
> clearance check again and noticed a few of the fan fins were closer than the
> others so I used a flap wheel to take a bit off them. Being the anally
> retentive perfectionist that I am I wanted to have it re-balanced.
>
> NOBODY in Australia drinks Fosters! It's exported. Here's a link to their
> website:
>
> http://www.fosters.com.au/enjoy/beer.htm
>
> Note in the paragraph below the bottles it reads "like Australia's favourite
> beer, Victoria Bitter."
>
> Regards,
> Rob Mueller
> 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 Craig Lechowicz
> Sent: Tuesday, 11 May 2010 1:06 AM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Onan Cooling Fan Balancing
>
>
>
> Rob wrote,
>>To smooth out the Onan in Double Trouble I want to have the cooling
>> fan balanced.
>
> Rob, unless something bad happened to your fan, I'm thinking at 1,800 rpm
> there is not a lot to be gained there. Pulleys/fans on cars at 3x the speed
> typically are net built and not balanced. My vote would be to invest that
> time and energy in a 6 pack of Foster's.
> --
> Craig Lechowicz
> '77 Kingsley, Waterford, MI
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Onan Cooling Fan Balancing [message #84044 is a reply to message #84036] |
Tue, 11 May 2010 07:43 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
Clever!
There you go, a two sentence, three line service bulletin on installing a
Pertronix ignition system on an Onan!
Regards,
Rob Mueller
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 Ken Burton
Sent: Tuesday, 11 May 2010 8:39 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Onan Cooling Fan Balancing
When I mounted my magnet I made it flush with the edge of the fin of the
flywheel. Then I checked that the flywheel cleared the pickup on all of the
fins all the way around.
On Dan's we mounted the magnet in the fin but it stuck up slightly higher
than the edge of the fin. This made it higher than any of the other fins
all the way around and eliminates any potential problem with higher fins.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription 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 Cooling Fan Balancing [message #84050 is a reply to message #84022] |
Tue, 11 May 2010 08:00 |
shawnee
Messages: 422
Registered: February 2004
Location: NC
Karma: 0
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Senior Member |
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| Robert Mueller wrote on Mon, 10 May 2010 23:20 |
Craig et al,
The first Pertronix unit John Sharpe and I installed on Double Trouble we
set as per the instructions (0.030 from the magnet). It got clobbered by the
fins of the cooling fan. I SWEAR that I turned the fan over and checked the
clearance between the pickup and each blade one by one before we started it.
It ran fine but hiccupped when I switched the circuit breaker on the Onan
on. When it hiccupped something must have shifted as that's when the pickup
got smacked. When we installed the second Pertronix we set the clearance to
the magnet at 0.060 and it worked fine. As a precaution I did the fan blade
clearance check again and noticed a few of the fan fins were closer than the
others so I used a flap wheel to take a bit off them. Being the anally
retentive perfectionist that I am I wanted to have it re-balanced.
NOBODY in Australia drinks Fosters! It's exported. Here's a link to their
website:
http://www.fosters.com.au/enjoy/beer.htm
Note in the paragraph below the bottles it reads "like Australia's favourite
beer, Victoria Bitter."
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
|
Rob,
I agree Fosters is not worth opening, but Victoria Bitter is a different story. Wish we could get it here to drink under the shade of the GMC awning. (Note this is GMC related)
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
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