Head bolts snapping

[fredfloggle]

We did not have torque figures or spanners then, no such thing, that was 1928

I wasn't around in 1928, but actually (and I should have known better) I was making a slightly tongue in cheek comment that you couldn't do the nut up without torque.

I can't comment on road vehicle engines, but RR certainly did have torque figures for aero engines in 1928.

 

[television]

I wasn't around in 1928, but actually (and I should have known better) I was making a slightly tongue in cheek comment that you couldn't do the nut up without torque.

I can't comment on road vehicle engines, but RR certainly did have torque figures for aero engines in 1928.

I will have a chat with Merlin

 

[spock500]

Not sure Facom's part of this mob, web sites awful and complete with speling mistakes -

http://www.sptools.co.uk/About/History/tabid/103/Default.aspx

 

[fredfloggle]

I will have a chat with Merlin

You do that, and in the meantime I'll have a look at a couple of Bristols.

 

[television]

You do that, and in the meantime I'll have a look at a couple of Bristols.

The Bristols that I have had all leaked around the arches and glass and start to smell after a while

 

[fredfloggle]

It's only a question of how you look after them. Personally all the ones I have seen have been in very good condition.

 

[BTB 500]

in the meantime I'll have a look at a couple of Bristols.

Phwoar ... lovely sleeve valves in there

 

[spock500]

Can you believe it after all that grief with the wrench the guy on fleabay refused to swap it or upgrade to a better brand even though I offered to pay the difference -

I dont know about anyone else but I always leave feedback the moment I receive the item as described, usually without testing or using it -

Have opted for the Halfords one which should be in tomorrow in time for the weekend, incidentially they have two, one which is from 10 - 50ft lb, the second 50 - 150ft lb which I guess makes them more accurate at the extreames of their ranges

 

[television]

Can you believe it after all that grief with the wrench the guy on fleabay refused to swap it or upgrade to a better brand even though I offered to pay the difference -

I dont know about anyone else but I always leave feedback the moment I receive the item as described, usually without testing or using it -

Have opted for the Halfords one which should be in tomorrow in time for the weekend, incidentially they have two, one which is from 10 - 50ft lb, the second 50 - 150ft lb which I guess makes them more accurate at the extreames of their ranges

You can retract and amend your feedback

 

[stats007]

Not on eBay you can't. You can mutually agree to remove it, but that's all.

 

[mikevernon]

Can you believe it after all that grief with the wrench the guy on fleabay refused to swap it or upgrade to a better brand even though I offered to pay the difference -

Hi Spock

While I sympathise with you for having broken the stud through your own mistake, I think you're being a little hard on the eBay seller and that to leave him negative feedback would be unfair. After all you have now used the torque wrench and possibly even damaged it (although hopefully not), so the seller could not re-sell the item. And it does sound very much as though it was your mistake - to actually snap the head stud would require a torque of at least 10 times the recommended initial torque figure!

On a more constructive note, when you tighten the new bolts always tighten at each stage in a single, smooth, continuous movement. In other words make sure that you don't stop turning until the torque wrench clicks at the pre-set figure (or until the correct reading appears on the scale). The reason for this is that the torque required to overcome the inital friction and start the bolt turning is higher than the torque required to keep it turning. Therefore if you stop just before the wrench clicks and then start again, you are likely to find that it will click before you have started turning it again. This means that the bolt will be tightened to a lower torque than you think.

 

[spock500]

Can you believe it after all that grief with the wrench the guy on fleabay refused to swap it or upgrade to a better brand even though I offered to pay the difference -

Hi Spock

While I sympathise with you for having broken the stud through your own mistake, I think you're being a little hard on the eBay seller and that to leave him negative feedback would be unfair. After all you have now used the torque wrench and possibly even damaged it (although hopefully not), so the seller could not re-sell the item. And it does sound very much as though it was your mistake - to actually snap the head stud would require a torque of at least 10 times the recommended initial torque figure!

On a more constructive note, when you tighten the new bolts always tighten at each stage in a single, smooth, continuous movement. In other words make sure that you don't stop turning until the torque wrench clicks at the pre-set figure (or until the correct reading appears on the scale). The reason for this is that the torque required to overcome the inital friction and start the bolt turning is higher than the torque required to keep it turning. Therefore if you stop just before the wrench clicks and then start again, you are likely to find that it will click before you have started turning it again. This means that the bolt will be tightened to a lower torque than you think.

Mike, I disagree, you are working on the assumption that I didnt hear the wrench click which is understandable.

I tried the wrench using a 12" adjustable spanner before going outside but nothing happened at 10ft lbs - my mistake was that I didnt realise what 10 or 27 fl lbs was supposed to feel like so I carried on in the hope it would work! a stupid and costly mistake I agree resulting in the snapped bolt.

The chap on Ebay states these are used on aircraft, I doubt that very much as they dont come with a certificate and the printed instructions are incorrect.

Also a wrench which claims to be accurate from 10 - 80 ft lbs (as I now know) will be inaccurate at the ends of each scale, so again unlikley to be used on aircraft.

Thanks for the advice on tightening, that makes sense and will take that onboard ater picking up the bolts tomorrow.

Picked up the Halfords wrench today :bannana: which feels like a nice bit of kit, complete with a March 08 certificate.

Chaps, thanks for all you advice and help

I shall try and post a few pics back once she's up and running!

 

[Dieselman]

Mike, I disagree, you are working on the assumption that I didnt here the wrench click which is understandable.

I tried the wrench using a 12" adjustable spanner before going outside but nothing happened at 10ft lbs - my mistake was that I didnt realise what 10 or 27 fl lbs was supposed to feel like so I carried on in the hope it would work! a stupid and costly mistake I agree resulting in the snapped bolt.

More likely , your mistake was to not check how the wrench was supposed to be used. Some torque wrenches require you to set the load to full on then back off to the correct torque. It sounds like this one does.

 

[television]

More likely , your mistake was to not check how the wrench was supposed to be used. Some torque wrenches require you to set the load to full on then back off to the correct torque. It sounds like this one does.

That's possible, but on all torque wrenches you are supposed to back them off when not in use

 

[moakesr]

The seller on ebay is up to no good, the words 'aircraft quality' 'ebay' and '£15' just don't go together.

If he was at all concerned with the quality of his tools he would want that wrench back and get it examined or sent back to the manufacturer. What's more likely is that he knows they are cheap chinese fakes and has no care what damage they cause.

Spock, if you made one mistake it was buying a cheap tool, I suspect you won't ever do that again.

Good luck with the rebuild, I hope this is only a temporary set-back.

 

[spock500]

Many thanks Richard,

Just popped in for a cuppa, heads back on :bannana: and timing up the cams before torquing the cam bearing covers down -

Going to try and get the key in tonight if weather holds out !

 

[spock500]

Had a bit of a false start as injection timing was 180o out, once that was sorted away she went -

Got to bolt back all the bits and pieces, pipe brackets ect but was pleased to hear the engine crack nto life after all this time :bannana:

 

[television]

So pleased that things are going well for you

 

[Dieselman]

Spock
How did you go about timing the pump?

 

[Howard]

Using logic , Jim ....