Best techniques for pulling pinion on MK3

p400

p400

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I have not had good results when fitting a puller to this engine , which has never had pinion off.
The three jaw pullers simply slide off the pinion after coming up to a modest torque.
I have ground the jaws to better profiles, but it seems the clamping force of the jaws is the issue.

Do I need to introduce heat to the pinion?
Maybe get it glowing hot ?

I have purchased a new puller as shown, which seems to match the pic at Andover.


20230820_PullerPinion21.jpg

The new puller has an end that will fit inside the hollow scooped crank end.
Will this be an issue?


Best techniques for pulling pinion on MK3
Best techniques for pulling pinion on MK3
 
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Are you screwing down the knurled outer sleeve once you have the jaws correctly located?
 
p400 said:
I have purchased a new puller as shown, which seems to match the pic at Andover.
Click to expand...


Another (third?) puller?
www.accessnorton.com

1975 850 Commando pinion removal tool issue

Disassembling a 850 Norton for rebuild, to the point of removing pinion gear. Purchase the silver plated tool and could not get the three jaws to tighten around the pinion, altho when off the shaft seemed to tighten down to the size needed. Purchased a second tool , not plated black oxide...
www.accessnorton.com www.accessnorton.com

That puller seems to have the same problem as the earlier two in that the parts of the jaw which locate against the washer flats are curved.

Could you post a picture of the tool in position with the sleeve screwed down?
 
The jaws must be very sharp , to grab behind the gear and not slip off with the pulling pressures applied . If they pop off home position you can carefully grind the jaw contact points sharper .
 
You have to grind quite a bit off the end of the legs - they are too thick to fit behind. I have two Norton pullers with the same problem. I've never bothered to fix them because my Triumph pinon puller works because it fits properly. Notice thickness of the cutaway washer behind it - the ends must be a little less than that.
 
Cliffa , Thanks , what is your technique for installing this puller on your last difficult Norton pinion pull?

LAB, Thanks, yes I put this project aside for this very issue , now looking at it again. Other than trying again and again, surely some Norton engine rebuilder have run this problem and have found useful techniques for this issue. If you have not run into a difficult pinion removal, and found a better technique, who has ?

I have pulled pinions from other Norton and have not had this issue using same tool.
Seem to remember one shop heating the pinion before installing tool for pull.

A post with no pics is usually worthless.

Best techniques for pulling pinion on MK3
 
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A bit crude way is to split the cases, support the timing side case so the crank is hanging from it, heat the case with a torch and drop out the crank and bearing. Then you can get at the pinion easier. The bearing must be replaced if you do that.

If the screw in the puller is bearing directly on the end of the crankshaft, to something about that like a thick washer.

If you heat the pinion, certainly don't come close to red hot! Just put some tension on it and warm it up. I've never heated one. The are not (normally) an interference fit. They should require very little pressure/tension to put on/take off.
 
The tool doesn't seem to be fitted correctly because the sleeve still appears to be on the tapered sections of the jaws as they haven't been ground to fit the flats of the backing washer so it seems to be the same problem as before.
Best techniques for pulling pinion on MK3

Unless the sleeve can be screwed down past the tapered sections and with the jaws not splayed then it's going to slip off the gear as you have found.

Best techniques for pulling pinion on MK3
Best techniques for pulling pinion on MK3
 
only slightly related to this problem is the method used to remove the inner race from the crankshaft. The local machine shop uses an oxy-acetylene torch to very quickly heat the bearing race just enough and then lightly taps the end of the crank on the table and the race falls off.
 
Greg suggestion sounded good, get crank out.
Heated with Mapp gas torch to about 350 or so and crank/bearing dropped out.
Pulled rods off.


When you receive the Andover tool, it comes with grinding instructions?

20230820_171910.jpg20230820_174145.jpg
 
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Post in thread 'Tools You Have Made to Maintain your Norton' https://www.accessnorton.com/Norton...ade-to-maintain-your-norton.32308/post-589194
My mate took the piss out of this tool
Saying it wouldn't work etc
Then he hired or borrowed a factory puller from "Roebuck motorcycles" a triumph dealer in Rainer's lane (anyone remember them?)and the puller broke!
He had to come and borrow my backyard made puller that pulled the pinion off with no bother
Not that I mention it too often to him of course 😂
 
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baz said:
Post in thread 'Tools You Have Made to Maintain your Norton' https://www.accessnorton.com/Norton...ade-to-maintain-your-norton.32308/post-589194
My mate took the piss out of this tool
Saying it wouldn't work etc
Then he hired or borrowed a factory puller from "Roebuck motorcycles" a triumph dealer in Rainer's lane (anyone remember them?)and the puller broke!
He had to come and borrow my backyard made puller that pulled the pinion off with no bother
Not that I mention it too often to him of course 😂
Click to expand...
I used to buy a lot of stuff from Roebuck, they were an excellent Triumph dealer, and very near where I lived at the time. I used my T140 as a daily rider for many years, couldnt have done it without their parts supply. Only recently took the Roebuck branded number plate off the bike as it was delaminating.
 
daveforty said:
I used to buy a lot of stuff from Roebuck, they were an excellent Triumph dealer, and very near where I lived at the time. I used my T140 as a daily rider for many years, couldnt have done it without their parts supply. Only recently took the Roebuck branded number plate off the bike as it was delaminating.
Click to expand...
Yep they were a great shop back in the day
 
p400 said:
Cliffa , Thanks , what is your technique for installing this puller on your last difficult Norton pinion pull?

LAB, Thanks, yes I put this project aside for this very issue , now looking at it again. Other than trying again and again, surely some Norton engine rebuilder have run this problem and have found useful techniques for this issue. If you have not run into a difficult pinion removal, and found a better technique, who has ?

I have pulled pinions from other Norton and have not had this issue using same tool.
Seem to remember one shop heating the pinion before installing tool for pull.

A post with no pics is usually worthless.

View attachment 109247
Click to expand...
Hi p400, thankfully I have not had the need to pull one yet, but on other (quality) pinion pullers I have used such as Sykes Pickavant, the collar would screw or drop all the way down to stop the legs splaying as you described. (in effect what the hose clip does). Glad you got it off anyway👍👍👍
 
I used a well placed flathead screwdriver and carefully pried/prised mine off. I was very surprised that it worked.
 

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