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| [GMCnet] We Fixed It! [message #181068] |
Tue, 21 August 2012 09:20  |
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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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G'day,
Had a GREAT day yesterday! We fixed tamed the Barbarian!
After spending hours checking this and checking that Emery and I decided to disconnect the Pertronix and hook up the points.
Fortunately JimB had been kind enough to give me one of the later model points sets (adjust like Chevy points with Allen head screw)
which made setting them easy.
For those of you with late model Onan's you have no idea how difficult it is to adjust the points on an early model. You need to get
in from BEHIND and adjust them using a feeler gauge. They have a screw that locks them to a plate when you're done. Pull your Onan
out and see how easy it is to look at the back side of the box that the points are in. It's a PITA!
At any rate we set the points roughly, disconnected the Pertronix, hooked up the points and hit the starter. She fired right up!
HOOO BLOODY RAY!
Today we'll pull the fan shroud to try and determine why the Pertronix failed.
Regards,
Rob M.
USAussie - Downunder
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] We Fixed It! [message #181073 is a reply to message #181068] |
Tue, 21 August 2012 09:52  |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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| Robert Mueller wrote on Tue, 21 August 2012 07:20 |
G'day,
Had a GREAT day yesterday! We fixed tamed the Barbarian!
After spending hours checking this and checking that Emery and I decided to disconnect the Pertronix and hook up the points.
Fortunately JimB had been kind enough to give me one of the later model points sets (adjust like Chevy points with Allen head screw)
which made setting them easy.
At any rate we set the points roughly, disconnected the Pertronix, hooked up the points and hit the starter. She fired right up!
HOOO BLOODY RAY!
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We all like to hear success stories. Some might think we have nothing but trouble with our GMCs but we also have great successes. Good job.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] We Fixed It! [message #181075 is a reply to message #181073] |
Tue, 21 August 2012 10:03 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Yikes
A step backwards ?
Gene
FREE WIFI @ Mickey D
On Aug 21, 2012, at 7:52 AM, George Beckman <gbeckman@pggp.com> wrote:
>
>
> Robert Mueller wrote on Tue, 21 August 2012 07:20
>> G'day,
>>
>> Had a GREAT day yesterday! We fixed tamed the Barbarian!
>>
>> After spending hours checking this and checking that Emery and I decided to disconnect the Pertronix and hook up the points.
>>
>> Fortunately JimB had been kind enough to give me one of the later model points sets (adjust like Chevy points with Allen head screw)
>> which made setting them easy.
>>
>> At any rate we set the points roughly, disconnected the Pertronix, hooked up the points and hit the starter. She fired right up!
>>
>> HOOO BLOODY RAY!
>
> We all like to hear success stories. Some might think we have nothing but trouble with our GMCs but we also have great successes. Good job.
> --
> '74 Eleganza, SE, Howell + EBL
> Best Wishes,
> George
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] We Fixed It! [message #181084 is a reply to message #181068] |
Tue, 21 August 2012 10:17 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I realize we got a LOT of Pertronix fans. I also realize, I've run box stock Onan twins for years without problems from the ignition. Personally, I'll be saving the money on mine at the outset. It runs the parts count up, plus it's putting a bag on the side.
--johnny
'76 23' transmode norris
'76 palm beach
From: Rob Mueller <robmueller@iinet.net.au>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, August 21, 2012 10:20 AM
Subject: [GMCnet] We Fixed It!
G'day,
Had a GREAT day yesterday! We fixed tamed the Barbarian!
After spending hours checking this and checking that Emery and I decided to disconnect the Pertronix and hook up the points.
Fortunately JimB had been kind enough to give me one of the later model points sets (adjust like Chevy points with Allen head screw)
which made setting them easy.
For those of you with late model Onan's you have no idea how difficult it is to adjust the points on an early model. You need to get
in from BEHIND and adjust them using a feeler gauge. They have a screw that locks them to a plate when you're done. Pull your Onan
out and see how easy it is to look at the back side of the box that the points are in. It's a PITA!
At any rate we set the points roughly, disconnected the Pertronix, hooked up the points and hit the starter. She fired right up!
HOOO BLOODY RAY!
Today we'll pull the fan shroud to try and determine why the Pertronix failed.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
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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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| Re: [GMCnet] We Fixed It! [message #181100 is a reply to message #181068] |
Tue, 21 August 2012 11:33 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Check the mounting. That unit gets it's ground through the mount. If you bolt and nutted it to the mount, install some tooth (star) washers and use lock nuts or double nuts the bolts. When I installed mine years ago I ran an extra ground wire from the mount to the engine.
Of course you also could just have a bad unit but that is rare.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] We Fixed It! [message #181108 is a reply to message #181068] |
Tue, 21 August 2012 12:15 |
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[quote title=Robert Mueller wrote on Tue, 21 August 2012 07:20]G'day,
For those of you with late model Onan's you have no idea how difficult it is to adjust the points on an early model. You need to get
in from BEHIND and adjust them using a feeler gauge. They have a screw that locks them to a plate when you're done. Pull your Onan
out and see how easy it is to look at the back side of the box that the points are in. It's a PITA!
Reminds me of the early Ford V8 (up to '36?); they mounted the distributor on the front of the crankshaft. One could take the box off and go to a Ford garage and they had a machine on which to set the dwell and point separation. Fun days.
geo groth '73 260 Sequoia
Carson City Nevada 89703
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| Re: [GMCnet] We Fixed It! [message #181324 is a reply to message #181307] |
Wed, 22 August 2012 16:54 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| emerystora wrote on Wed, 22 August 2012 15:48 |
On Aug 21, 2012, at 10:33 AM, Ken Burton wrote:
>
>
> Check the mounting. That unit gets it's ground through the mount. If you bolt and nutted it to the mount, install some tooth (star) washers and use lock nuts or double nuts the bolts. When I installed mine years ago I ran an extra ground wire from the mount to the engine.
>
> Of course you also could just have a bad unit but that is rare.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
I think that you must have missed a Stouple of the messages, Ken. The Petronix was ground up by hitting the magnet and the magnet was knocked out. There was no ground problem.
Emery
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That depends on your definition of "ground". It sound like the Pertronix unit was ground up.
You are correct. I did not know that the unit had hit the flywheel / magnet.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] We Fixed It! [message #181377 is a reply to message #181226] |
Thu, 23 August 2012 00:02 |
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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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Gene,
I intend to install another Pertronix, however, I intend to re-engineer the installation. As noted earlier when I re-installed it
back in February after installing the re-balanced flywheel / cooling fan I checked to make sure that the clearance between the
magnet and the Pertronix was correct. I then turned the flywheel slowly and checked that there was adequate clearance between the
Pertronix pickup and every fin on the flywheel.
It is apparent from the pictures that the Pertronix module shifted. The side that faces the magnet has been "scraped" quite a bit.
It is interesting to note that it still kept working. I reckon it stopped working when the magnet departed.
Hopefully I can figger out a way to install a Pertronix using the bolt just to the left of the timing hole.
> I like the mount, - Thanks!
- bad epoxy? - Nope, God knows how long the magnet hit the Pertronix.
- why not just fix it? - The Pertronix is damaged badly. Because it could do the same thing!
- not a failed Pertronix, failed implementation? - Absolutely, however, this had worked for three maybe four years!
- get back on the horse ;>) - You Bet!
Regards,
Rob
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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] We Fixed It! [message #181381 is a reply to message #181377] |
Thu, 23 August 2012 02:19 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I dod nto look at you installation pictures carefully but I suggest that if you use bolts and nuts that you use tooth washers for a good ground and then a nylon lock nut. Then double nut it with a jam nut after you are finished. Another solution is to pop rivet the assembly in place or use a combination of bolts with double nuts and and pop rivets.
When you mount the magnet it does not have to be flush with the fin. Make it stick up a bit so it is the highest thing coming around on that flywheel.
A year or so ago I suggested to Dan that we check his to make sure it is still securely mounted. We never got it done. Dan you might want to check yours.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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