tightening torques

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Ugo
Posts: 2
Joined: Thu Jun 06, 2024 5:26 am

tightening torques

Post by Ugo » Thu Jun 06, 2024 6:02 am

Good morning, I would like to know the tightening torques of the connecting rods and crankshaft. Thanks ugo

Rod
Posts: 101
Joined: Sun Nov 24, 2019 9:44 am
Location: New Zealand

Re: tightening torques

Post by Rod » Fri Jun 07, 2024 10:36 pm

Hey Ugo,
I'm sure others will join in, but here's my 10 cents worth...

If you're talking about pre-WW2 cars, generally speaking there are no published torque figures (apart from a single reference that I found in the Austin Service Journal which was specifically for cylinder head fastenings).
This goes for the majority of pre-war UK mass-produced cars, not only Austin, so far as I can tell. Although the same isn't always true for pre-war US build cars.

Torque settings must have been used in production, but torque wrench usage in a UK workshop environment (even at a Dealer) would have been unusual in those days. Most things were tightened by 'feel', and 'feel' was learned by many hours of experience.

Usual advice was to 'tighten firmly using a well-fitting spanner of normal length'- or words to that effect, and the spanners of the day were sized accordingly, so caution advised if youre using modern kit.

One thing to note is, don't back off or over tighten the nuts to get the castellation slots in the nut to line up with the hole in the threaded fastening to enable fitting the split pin, or to line up the locktab with a flat on its nut. Either swap the nuts around for a better alignment or accurately face off the bottom of the nut. And make sure your threads are in good condition and none of the studs/bolts have been 'necked' by previous over-zealous tightenings

Ugo
Posts: 2
Joined: Thu Jun 06, 2024 5:26 am

Re: tightening torques

Post by Ugo » Sat Jun 08, 2024 4:50 am

Thanks so much for your advice, Ugo

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