discomark10 · Mar 30, 2013

Hmmm bit of a ****ter today... doing up the head bolts and one seemed to keep doing up before reaching the desired 90nm and SNAP managed to undo it it one piece. Turns out the trusty old torque wrench is no longer accurate. Brought a new one and tested the old one at 90 and it read 112nm on the new one! Hence the snapped bolt!

Dr_evil · Mar 30, 2013

when did you last check it and what make ?

it appears some brands hold their accuracy better

discomark10 · Mar 30, 2013

Ill check later... its about 20years old

jamesmartin · Mar 30, 2013

Dr_evil said:
when did you last check it and what make ?

it appears some brands hold their accuracy better

and slacken them off after use

discomark10 · Mar 30, 2013

its a norbar, looks very similar to this https://www.google.co.uk/search?hl=...m%2Fviewtopic.php%3Ff%3D33%26t%3D1114;800;481

on another note, here is the broken bolt

Dr_evil · Mar 30, 2013

Norbar are good ones, no idea how quickly they go out of accuracy though

My cheap ass britool one I got off ebay was just outside the tolerance after a few years of no calibration, guy I got it off couldn't remember when he bought it but only 3% outside perfect.

Shouldn't be hard to get it re calibrated though, I did mine on a torque tester but sure if you ask a local garage they'll tell you where they get theirs done

discomark10 · Mar 30, 2013

oh they can be calibrated!? the old man will be happy, he just brought one at halfrauds for 75 notes

Dr_evil · Mar 30, 2013

its just a spring inside, either needs tightening, loosening or replacing with a new one AFAIK

sounds like yours has become overly stiff if 90 is coming in at over 112, you're about 20% out

fett · Mar 30, 2013

do they go out with use or time?

Dr_evil · Mar 30, 2013

mix of both I'd think, strain and wear on the spring during use and deterioration of metal over time, fatigue etc

Mr Noisy · Apr 1, 2013

One would assume they would under torque with time especially if not slackened after use.

discomark10 · Apr 1, 2013

Yea makes sence... no idea whats up with it. Just glad it didnt sprip a thread or snap and get stuck .

Dr_evil · Apr 1, 2013

my guess would be it can only go in so far before hitting the block, would think its tried to compress the base of the tap, lost and then something had to give. Had to be the bolt as the block was bigger so it won

Mr Noisy · Apr 1, 2013

Yeah you had a lucky escape really!

Maybe the mechanicals inside yours are worn/damaged as Doc suggested. That's way over torque so it's looking like something jamming.

discomark10 · Apr 1, 2013

Got a bit of a question. The actuator at the back of the plenum, should you be able to move it by hand?

Mr Noisy · Apr 1, 2013

??

The stepper?

discomark10 · Apr 1, 2013

Mr Noisy said:
??

The stepper?

yea thats it

Mr Noisy · Apr 1, 2013

It screws in and out using the stepper motor, so no you can't push it in and out by hand.

Plug it in and turn the igntion on and off and it should move iirc, or it winds in as soon as the engine fires at least!

discomark10 · Apr 1, 2013

It was stuck solid. Used a bit of wd on it and it has a bit of movement now. Will have to test it when the lumps in

fett · Apr 1, 2013

dont twist it or it can break the end off quite easy

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