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which Torque on headscrews?

Lenni

Active Forum Website User
VOC Member
Dear all,
does anybody know how high the torque for the headscrews ET56 and FT 161 are?
Is 100 Nm correct?

Thanks Lenni
 
Last edited by a moderator:

stumpy lord

Well Known and Active Forum Website User
VOC Member
HI,
Not more than 30 foot lbs on the head nuts, unless of course you want to crush the heads, the ft161 are lock nuts and do need to be tight. what I do is hold the bottom nut with a spanner, and using annother one pull the top nut down tight against the lower nut.
stumpy.
 

Lenni

Active Forum Website User
VOC Member
Hi Stumpy,
thanks for your answer. If I calculate right: 1 foot equals 0,3048m
1 lbs equals 4,53 N (Newton)
So 30 foot lbs equals 41,42 Nm. That is in my point of vieuw handtight.
Or is there something wrong in my calculation?

Lenni
 

Comet Rider

Well Known and Active Forum Website User
VOC Member
Torque figures

Hi Lenni
30 LB Ft converts to 40.7 NM

You should not go above this for a standard head, otherwise you could distort it.

Neil
 

BlackLightning998

Well Known and Active Forum Website User
VOC Member
I thought that was Series B with hollow spindles?

The Riders Handbook says 30/35 but this covers B's which had hollow spindles does it not? - I've spoken to engine builders (not mine I hasten to add) who say anywhere between 40 and 45 for a Series C is fine.

Stuart


O.k. 40 Nm is the best. Above is just fix the hb an locknut!
great

Lenni
 

Comet Rider

Well Known and Active Forum Website User
VOC Member
Over torque

The Riders Handbook says 30/35 but this covers B's which had hollow spindles does it not? - I've spoken to engine builders (not mine I hasten to add) who say anywhere between 40 and 45 for a Series C is fine.

Stuart

Hi Stuart,

If you over torque the head, you run the risk of distorting the head:mad:

Neil
 

Comet Rider

Well Known and Active Forum Website User
VOC Member
After running in

Hi all,
I did 40 Nm now. Thanks for your help.

Lenni

Hi Lenni,
Do not forget to check and re-torque the head bolts after around 150 kM as everything will settle during use. If you hav access to an open ended adapter for your torques wrench this makes things much easier.

Good luck
Neil
 
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