classic car forum header
Classic cars forum & vehicle restoration.
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Register     Posting Photographs     Privacy     F/book OCC Facebook     OCC on Patreon

Head nuts
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Mechanical Restoration
Author Message
Miken



Joined: 24 Dec 2012
Posts: 544

PostPosted: Fri Jun 29, 2018 9:51 am    Post subject: Head nuts Reply with quote

What would be a suitable torque setting for the cylinder head nuts on a vintage 4 cylinder side valve engine with everything in good condition, new studs/nuts and flat faces?
Nuts/studs are M12 x1.5 .
Thanks
Mike
Back to top
View user's profile Send private message
Kleftiwallah



Joined: 27 Oct 2016
Posts: 222
Location: North Wiltshire

PostPosted: Sat Aug 11, 2018 9:57 am    Post subject: Reply with quote

This is absolutely no use to at all but...

A very old instructor (he started his career on steam wagons! Answered a similar question put forward by myself on torque loading in general.

He said " Tighten it until it shears then back it off a flat"!

I should just 'feel for it' and than re-tighten later on after a few miles but how did you get metric nuts on a vintage engine?

Cheers, Tony.

_________________
It may work in practice, but not necessarily in theory!
Back to top
View user's profile Send private message
Keith D



Joined: 16 Oct 2008
Posts: 1127
Location: Upper Swan, Western Australia

PostPosted: Sat Aug 11, 2018 3:36 pm    Post subject: Reply with quote

Morris Cowleys and Oxfords (vintage years bullnose and flatnose models) used Hotchkiss engines from the French company. When William Morris bought them out in about 1919, he made his bolts with the metric threads but made them using imperial hex rod.

Keith
_________________
1926 Chrysler 60 tourer
1932 Austin Seven RN long wheelbase box sedan
1950 Austin A40 tourer
1999 BMW Z3
Its weird being the same age as old people.
You are either part of the problem or part of the solution
Back to top
View user's profile Send private message
Kleftiwallah



Joined: 27 Oct 2016
Posts: 222
Location: North Wiltshire

PostPosted: Sun Aug 12, 2018 11:02 am    Post subject: Reply with quote

Many thanks for the technical info' Keith D.



Smile Cheers, Tony.
_________________
It may work in practice, but not necessarily in theory!
Back to top
View user's profile Send private message
Kleftiwallah



Joined: 27 Oct 2016
Posts: 222
Location: North Wiltshire

PostPosted: Sun Aug 12, 2018 2:51 pm    Post subject: Reply with quote

Good afternoon Miken,

I may be able to help. I've just been searching through the 'bumf' in the shed for some information not related and came across a booklet entitled "Nut tightening torque data" by Britool for Automobiles, Engines, Tracxtors and Sparking plugs.

Ifg you could tell me what vintage engine it is, I'll see if it's covered.

Cheers, Tony.
_________________
It may work in practice, but not necessarily in theory!
Back to top
View user's profile Send private message
Miken



Joined: 24 Dec 2012
Posts: 544

PostPosted: Wed Aug 15, 2018 5:19 am    Post subject: Reply with quote

All sorted now. The bullnose Morris club who supply the gaskets , nuts and studs recommend 65 ft/lb.
Thanks, Mike
Back to top
View user's profile Send private message
Kleftiwallah



Joined: 27 Oct 2016
Posts: 222
Location: North Wiltshire

PostPosted: Wed Aug 15, 2018 10:42 am    Post subject: Reply with quote

Nice to hear you have sussed it.

Cheers, Tony. Very Happy
_________________
It may work in practice, but not necessarily in theory!
Back to top
View user's profile Send private message
roverdriver



Joined: 18 Oct 2008
Posts: 1210
Location: 100 miles from Melbourne, Victoria, Australia

PostPosted: Thu Aug 16, 2018 7:27 am    Post subject: Reply with quote

In the days before the universal ownership of torsion wrenches, it was generally assumed that the standard spanner was design to give the correct tension on a nut if just reasonable pressure was applied. I know that means that a strong person would apply more than an average person, but the spanner itself was the key. Small diameter bolts has small nuts and a small, short length spanner. As the bolt/nut size increases, so to does the length of the shaft of the spanner. This is no accident, it was carefully designed that way. The longer the shaft, the greater the pressure that can be applied at the nut. Often car tool kits had a specially designed spanner for those nuts that needed extra torque, so the kit had a special spanner for the job. Model T and A Fords had a special head stud spanner, and I believe other makes in the same period also worked the same way.
_________________
Dane- roverdriver but not a Viking.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Mechanical Restoration All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
OCC Merch link
Forum T&C


php BB powered © php BB Grp.