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Tightening cylinder base nuts

Submitted by julian_wells on Thursday, 23 March, 2017 - 00:00
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Commando

In the workshop manual (section C33 in the 1973 edition) it says

"14 Tighten the cylinder base nuts in sequence."

Unfortunately it fails to specify what the sequence is.

I assume that alternating sides and front/back (i.e. on the lines of the sequence for the cylinder head fasteners) is correct, but is it better to start in one place rather than another? (Cylinder head procedure is to start with the two between the cylinders, of course.)

Submitted by tony_ripley on Friday, 24 March, 2017 - 00:01

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Hi,

All this means is, tighten each one a little and work your way round a bit at a time rather than torquing one up fully before moving onto the next.

As you say, follow the basics of the head sequence but the important bit is a little bit at a time.

Regards

Tony

Submitted by andrew_heathwood on Saturday, 25 March, 2017 - 00:00

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Hi Julian

The only reference I've seen is in the 850 Mk3 Workshop Manual (1975 00-4224) in section C33 where the final para states, 'Tighten the cylinder fixings in diagonal sequence working to torque settings ...'

So as Tony suggested something like this:

http://www.nortonownersclub.org/support/technical-support-common/twin-cylinder-head-tightening-1

Although there is also a Method 2:

http://www.nortonownersclub.org/support/technical-support-common/dominator-twin-cylinder-head-tightening-2

Andy

Submitted by julian_wells on Saturday, 25 March, 2017 - 00:02

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Andrew

Thatâs really helpful -- and I always like an animation ...

And thanks to Tony for also confirming my expectation.

Julian

Previously Andrew Heathwood wrote:

Hi Julian

The only reference I've seen is in the 850 Mk3 Workshop Manual (1975 00-4224) in section C33 where the final para states, 'Tighten the cylinder fixings in diagonal sequence working to torque settings ...'

So as Tony suggested something like this:

http://www.nortonownersclub.org/support/technical-support-common/twin-cylinder-head-tightening-1

Although there is also a Method 2:

http://www.nortonownersclub.org/support/technical-support-common/dominator-twin-cylinder-head-tightening-2

Andy

Submitted by julian_wells on Wednesday, 29 March, 2017 - 01:00

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Just found the following on

https://www.oldbritts.com/n_torq.htmlCYLINDER BASE 750:Start lettering with the front centre studA (20 ft lb.) and proceed clockwise to B (20 ft lb.), C (25 FT LB), D (25 FT LB), E (25 FT LB), F (25 FT LB), G (25 FT LB), H (25 FT LB) and ending with the last stud I (20 ft lb.)The tightening order will be C, G, H, D, E, F, A, B, I

 



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