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jsouthard
Joined: 26 Jul 2008 Posts: 42 Location: Detroit Michigan
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Posted: Mon Oct 20, 2008 9:53 am Post subject: Head Removal |
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Mighty Norton Knowledgeable,
Trying to dismantle the head on my 850. I am stuck on bolt #2. The bolt on the inside near the carbs. I cant get a wrench around it with the limited space. I also cant use sockets because of the small space.
Any suggestions on getting that bolt loosened up? |
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L.A.B. Moderator
Joined: 20 Nov 2004 Posts: 1948 Location: Norfolk, UK
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Posted: Mon Oct 20, 2008 10:29 am Post subject: |
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You will probably have to grind down a wrench to get it to fit on that nut!
I'm sure most of us Commando owners have our own "special tool" ground-down for that very purpose.
If you don't want to ruin an expensive (1/4" Whitworth) wrench, then I suggest you grind up a cheap 1/2 A/F or 13mm open ended wrench?
The jaws of the 1/2 A/F or 13mm wrench would also need to be ground out a little, in order to fit the 1/4" Whitworth (0.525"/13.34mm) nut hexagon. |
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Cookie
Joined: 05 Oct 2008 Posts: 169
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Posted: Mon Oct 20, 2008 11:33 am Post subject: |
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| Man that always was a misery. If I recall I also heated and bent a wrench to get a better angle. It is easier to start with a Whitworth. |
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B-Stone
Joined: 05 Jul 2008 Posts: 30
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Posted: Mon Oct 20, 2008 7:33 pm Post subject: |
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| Same here. Used an offset Whitworth on my 750 heads. Just got enough bite to crack it then a whole bunch of super mini turns. |
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dgwilson
Joined: 18 Jan 2006 Posts: 102 Location: Adelaide
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Posted: Mon Oct 20, 2008 10:24 pm Post subject: |
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I have always been able to remove the head with a ground down spanner of some sort. My main concern has always been replacing the head and getting the correct tension on the head bolts. How do you supposed to retorque accurately.
I've always guessed it by feel but never been confident until a few hundred miles is put on the engine.
What are the techniques for torqueing up the head bolts? |
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JimC
Joined: 12 Oct 2007 Posts: 208 Location: Port St. John, FL
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Posted: Tue Oct 21, 2008 6:22 am Post subject: |
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My technique is to use the wrench on a properly torqued fastener to get a "feel" for the amount of force needed on the wrench. Then go to the nut that's only accessible with the wrench. Keep in mind over torquing is worse than under torquing.
As someone else here mentioned, Helicoil those studs. The studs do not have to be Whitworth. A 3/8" stud of the proper length threaded 3/8-16 on one end, 3/8-24 on the other. I use a grade 8 bolt cut down to length. Use a grade 8 nut 3/8-24 and you are in business. All that stuff is available at your local hardware store. No need for specialty Helicoil and studs. |
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Cookie
Joined: 05 Oct 2008 Posts: 169
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Posted: Tue Oct 21, 2008 8:17 am Post subject: |
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I take it then that people have had those studs pull out? When I worked on Nortons it was always the first rebuild and the bikes were not very old.
I never had a problem with those studs but that was many years ago. I have a lot to catch up on. |
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Yellow_Cad
Joined: 02 Apr 2008 Posts: 159 Location: Sacramento, CA
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Posted: Tue Oct 21, 2008 3:11 pm Post subject: |
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| I've always gone by something I heard a long time ago and that is that a normal length spanner wrench pulled good and hard is 55 lbs. of torque. So, less hard, less torque, etc. |
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illf8ed
Joined: 30 Dec 2003 Posts: 475
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Posted: Tue Oct 21, 2008 6:44 pm Post subject: special tool for that nut |
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Hi Joe,
Ebay is a great thing. I found the special tool several years ago and bought it for $10. It's a double ended short well socket with a curved handle. The sockets are short enough to fit in there. Not sure about the tool number, but mine is stamped E.C. 21. Also fits the front long nuts going upward from the front of the cylinder (750 Commando).
David |
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Yellow_Cad
Joined: 02 Apr 2008 Posts: 159 Location: Sacramento, CA
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Posted: Tue Oct 21, 2008 8:45 pm Post subject: |
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| Illf8ed, can you post a photo of your tool find so we can get some ideas? |
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Alpha
Joined: 13 Mar 2005 Posts: 21 Location: St Evenage
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Posted: Tue Oct 21, 2008 11:23 pm Post subject: |
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| jeez I didnt realise this was that sort of forum...... |
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jsouthard
Joined: 26 Jul 2008 Posts: 42 Location: Detroit Michigan
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Posted: Mon Oct 27, 2008 10:50 am Post subject: |
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Turns out there is a King Dick Whitworth wrench that fits perfectly to get that nut out.
The designated size for the nut in question is 1/4" BSW. It needs to be a thin wall box end wrench.
I ordered one from the great Phil at fairsparesamerica.com
joe |
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grandpaul
Joined: 15 Jan 2008 Posts: 654 Location: Laredo (south) Texas
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Posted: Mon Oct 27, 2008 11:10 am Post subject: |
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Sometimes, cheap is okay.
The cheap Whitworth combo wrench set I have uses thin-walled box ends with 12 points, so you can just get that sucker in there and it works a treat. |
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The Unapproachable Norton Commando
At the end of 1967 the Norton Commando was announced.
The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.
It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.
Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.
It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.
The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.