Mk3 Torque Settings

P

Paul Giusti

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Jul 2, 2019
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Gents,

In the process of putting my Mk3 back together after an extensive rebuild. I am using the shop manual for the torque settings and for example it says 25 ft/lbs for the motor mount bolts. This seems a bit low to me? My question is do you think the manual has correct settings or are there any listed settings I should do differently?

Thanks,
Paul
 
That is the correct torque setting . 25 ft. lbs.
Listed settings you should do differently are :
Rear wheel spindle . Not 80 ft. lbs. but less , 50 to 60 ft. lbs .
Main shaft Nut slightly less at 40 ft. lbs. ( Fit a harder material circlip , 06-8072 , sanded thinner for a tight slot fit ) .
Clutch nut 40 ft. lbs. , with blue lock tight . ( You might want to get rid of any soft bend over tab retention washer and use a harder steel washer ) .
 
Torontonian said:
Main shaft Nut slightly less at 40 ft. lbs. ( Fit a harder material circlip , 06-8072 , sanded thinner for a tight slot fit ) .
Clutch nut 40 ft. lbs. , with blue lock tight .
Click to expand...

The mainshaft nut is the clutch nut or at least the nut at the clutch end of the mainshaft.
Torontonian said:
( You might want to get rid of any soft bend over tab retention washer and use a harder steel washer ) .
Click to expand...

If it is the later assembly with the tab washer, there should also be a hardened steel washer 06.3447 (58).

andover-norton.co.uk

Andover Norton Parts Drawings - Andover Norton Factory Parts - Commando Parts

Andover Norton Parts are the only Norton spare parts in the market manufactured to original drawings, within the factory-approved tolerances, from the correct materials, and with the correct finish.
andover-norton.co.uk
 
L.A.B. said:
The mainshaft nut is the clutch nut.


If it is the later assembly with the tab washer, there should also be a hardened steel washer 06.3447.

andover-norton.co.uk

Andover Norton Parts Drawings - Andover Norton Factory Parts - Commando Parts

Andover Norton Parts are the only Norton spare parts in the market manufactured to original drawings, within the factory-approved tolerances, from the correct materials, and with the correct finish.
andover-norton.co.uk
Click to expand...
Thanks L.A.B. , now corrected in my notes . Also rear wheel nut left side ( Dummy Spindle ) should be less than manual 80 ft. lbs . Revised notes say 50 to 60 Ft. lbs .
 
I read about doing the clutch nut at 40ft/lbs after I'd got my 850 mk3 back on the road. I had used AN parts on the clutch and tightened to the manual's torque spec. I've done 5 or 6,000 miles since without problems, so I have left it alone.

When I got my bike, it vibrated. I feared it was the isolastics. On checking, several of the engine mounts were at least a quarter turn off feeling tight. I tightened them to man-tight (not gorilla) and the vibes vanished. I still check them each service and they haven't moved yet.
 
Mart UK said:
When I got my bike, it vibrated. I feared it was the isolastics. On checking, several of the engine mounts were at least a quarter turn off feeling tight. I tightened them to man-tight (not gorilla) and the vibes vanished. I still check them each service and they haven't moved yet.
Click to expand...
Is the cradle powder coated? The gradual crushing of the plastic coating is a classic cause of this. And if loose engine / cradle fasteners are not caught in time they result in cases that are damaged / cracked / broken around the mounting points.
 
I thougth that MK3 iso bolt torque setting was upgraded to 30 instead of 25 for previous model , but LAB will confirm !
 
marinatlas said:
I thougth that MK3 iso bolt torque setting was upgraded to 30 instead of 25 for previous model , but LAB will confirm !
Click to expand...

Yes and that is in the Mk3 manual, the bolts being asked about were the engine mounting bolts and 25 lbs. ft. should be fine although I just do them up tight, I'm not sure I've ever torqued them.
 
Fast Eddie said:
Is the cradle powder coated? The gradual crushing of the plastic coating is a classic cause of this. And if loose engine / cradle fasteners are not caught in time they result in cases that are damaged / cracked / broken around the mounting points.
Click to expand...
No, did not powder coat it during rebuild. It was almost down to bare metal so cleaned it up really well and hit it with a couple coats of black high temp paint.
 
Paul Giusti said:
No, did not powder coat it during rebuild. It was almost down to bare metal so cleaned it up really well and hit it with a couple coats of black high temp paint.
Click to expand...
That's my MK 111 in the avatar photo . Powder coated , but masked and scraped down at all close contact points . Nothing wrong with good paint , good luck with the refit .
 
Paul Giusti said:
No, did not powder coat it during rebuild. It was almost down to bare metal so cleaned it up really well and hit it with a couple coats of black high temp paint.
Click to expand...
Pictures when you're ready. Check them over regularly for the first couple of thousand miles. Then each service. 👍
 

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