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Have you checked your torque wrench calibration? #603693
15/11/19 08:40 PM
15/11/19 08:40 PM
Joined: Aug 2017
Posts: 64
Staffordshire UK
Calypso Red Offline OP
Just Getting Started
Calypso Red  Offline OP
Just Getting Started

Joined: Aug 2017
Posts: 64
Staffordshire UK
I sucessfully changed my 4/4 cambelt, a feeling of smug satisfaction.

A few days later I came across a YouTube video, 'How to calibrate your torque wrench'.
https://www.youtube.com/watch?v=XaqBA-xSGbc

Out of curiosity I checked my large torque wrench, 60 - 220ftlbs, which was spot on. However, when I checked my small torque wrench, 10 - 80ftlbs, which I have had for about 10 years, I found it was 'clicking' at a value approximatly 25% below the set value. There are videos on YouTube which show how to reset a torque wrench, so now, it is spot on.

Then I realised I had a problem! My small torque wrench is very useful for the low values required when working on an aluminimum engine and I had used it for the majority of the cambelt change. 10 -15% error I could live with but not 25% when a cambelt is involved. So yes, I took it all apart and put it back together again, with the correct torque values.

The learning point, 'It pays to calibrate your torque wrench now and again' frown2


Calypso Red
1994 +8 BMW Calypso Red.
2002 4/4 4 seater BMW Calypso Red.
Re: Have you checked your torque wrench calibration? [Re: Calypso Red] #603739
16/11/19 09:42 AM
16/11/19 09:42 AM
Joined: Apr 2014
Posts: 5,545
Renfrewshire
BobtheTrain Offline
Charter Member
BobtheTrain  Offline
Charter Member

Joined: Apr 2014
Posts: 5,545
Renfrewshire
Interesting. "Every day is a school day".


Best Regards
Lang may yer lum reek
Re: Have you checked your torque wrench calibration? [Re: Calypso Red] #603745
16/11/19 10:02 AM
16/11/19 10:02 AM
Joined: Aug 2015
Posts: 679
A
Arwyn Williams Online content
Talk Morgan Regular
Arwyn Williams  Online Content
Talk Morgan Regular
A

Joined: Aug 2015
Posts: 679
Yes, once a year and always just before I rebuild an engine. It helps that my neighbour can get them recalibrate and certified.

How many people know there is a correct way to store a torque wrench?

Arwyn

Re: Have you checked your torque wrench calibration? [Re: Calypso Red] #603748
16/11/19 10:11 AM
16/11/19 10:11 AM
Joined: Apr 2008
Posts: 7,982
Gloucestershire, UK
Hamwich Offline
Talk Morgan Guru
Hamwich  Offline
Talk Morgan Guru

Joined: Apr 2008
Posts: 7,982
Gloucestershire, UK
Although I have a torque wrench (which I do store correctly, fully slackened) I find often I just use an electronic fish scale (like that used in the video) to apply a measured amount of torque. Hook it into the end of a ring spanner, measure the distance, and it's easy to calculate the correct weight to pull at. Very handy when a full size torque wrench can't be brought to bear.


Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 1957 R4 CV, 2005 Ferrari Vipar
Re: Have you checked your torque wrench calibration? [Re: Calypso Red] #603749
16/11/19 10:16 AM
16/11/19 10:16 AM
Joined: Jul 2019
Posts: 420
L
Luddite Offline
Learner Plates Off!
Luddite  Offline
Learner Plates Off!
L

Joined: Jul 2019
Posts: 420
Torque wrench...? I was taught that the size of bolt, the material used and the thread type, alongside the likely spanner weight and length averaged out one`s expectations on how much pressure to apply when tightening things....?

But in more advanced engineering terms, I ever park my torque wrench with it wound right back taking pressure off the spring... smile

Re: Have you checked your torque wrench calibration? [Re: Calypso Red] #603754
16/11/19 10:41 AM
16/11/19 10:41 AM
Joined: Mar 2010
Posts: 2,475
Petersfield, Hampshire, UK
Ian Wegg Offline
Talk Morgan Expert
Ian Wegg  Offline
Talk Morgan Expert

Joined: Mar 2010
Posts: 2,475
Petersfield, Hampshire, UK
Certainly an entertaining video! He needs to do a follow up on how to recalibrate your luggage scale, perhaps by weighing a litre of water at 4 degrees C? Then another one on how to recalibrate your thermometer ... hide


1980 Royal Ivory 4/4 4-seater. B4771
Re: Have you checked your torque wrench calibration? [Re: Luddite] #603757
16/11/19 10:52 AM
16/11/19 10:52 AM
Joined: Apr 2008
Posts: 7,982
Gloucestershire, UK
Hamwich Offline
Talk Morgan Guru
Hamwich  Offline
Talk Morgan Guru

Joined: Apr 2008
Posts: 7,982
Gloucestershire, UK
Originally Posted by Luddite
Torque wrench...? I was taught that the size of bolt, the material used and the thread type, alongside the likely spanner weight and length averaged out one`s expectations on how much pressure to apply when tightening things....?


I read somewhere of a study that demonstrated that for fasteners tightened without a torque wrench, the vast majority of small sizes were over-tightened, and the vast majority of larger sizes were under-torqued.

I was amazed when I did the cambelt on my Ecotec engine. Because it has variable cam timing I decided to replace the cam wheels at the same time as they have internal oil ways and gubbins to do the phase change. There are no keyways or detents on the cam shafts, the wheels are just dialled into position and locked on to the taper with torque, about 95 ft-lb if memory serves. You certainly wouldn't want to get that wrong by under-tightening and having them come loose! :-)


Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 1957 R4 CV, 2005 Ferrari Vipar
Re: Have you checked your torque wrench calibration? [Re: Calypso Red] #603758
16/11/19 11:00 AM
16/11/19 11:00 AM
Joined: Dec 2014
Posts: 622
Antwerpen Belgium
stefan s Offline
Talk Morgan Regular
stefan s  Offline
Talk Morgan Regular

Joined: Dec 2014
Posts: 622
Antwerpen Belgium
V good tip .Going to check.

Stefan

Re: Have you checked your torque wrench calibration? [Re: Calypso Red] #603759
16/11/19 11:03 AM
16/11/19 11:03 AM
Joined: Feb 2016
Posts: 2,079
East Harling, Norfolk UK
Richard Wood Offline
Talk Morgan Expert
Richard Wood  Offline
Talk Morgan Expert

Joined: Feb 2016
Posts: 2,079
East Harling, Norfolk UK
The first time I used a torque wrench on small bolts, in this case for split brake caliper, I was surprised how much torque was physically needed - way more than I would have naturally used for the size of bolt.

ETA: On the other hand, an old school Rolls Royce trained engineer once told me they were only issued with short open end/ring spanners to avoid over-tightening.

Last edited by Richard Wood; 16/11/19 11:11 AM.

Richard

2018 Roadster - Red/Magnolia - "Morton"
1967 Land Rover series 2a SWB
1960 Velocette Venom
Re: Have you checked your torque wrench calibration? [Re: Calypso Red] #603768
16/11/19 12:03 PM
16/11/19 12:03 PM
Joined: Jul 2019
Posts: 420
L
Luddite Offline
Learner Plates Off!
Luddite  Offline
Learner Plates Off!
L

Joined: Jul 2019
Posts: 420
Ian... you omitted to suggest checking at what temperature one`s steel rule would be accurate.... unless it was made of invar.. (-:

No argument from me as to the value of a torque wrench..... provided it has an in date calibration certificate...(-:

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