head bolts

[winterheating]

not to worry everybody, they been tighten to 70 n/m plus extra 28nm wich must be some of the 1/4 turn so see what happens a trev

well if they been done to 70nm an extra 28nm would mean they been done to 98nm alltogether? yeah
if it were just 28nm it wouldnt budge anymore

[trev15]

yes m8 tighten all to 70n/m as book says then tried angle torque but couldnt work it so give up left them at 70n/m then set torque wrench to 98 n/m so now all 98n/m and hopeing for best

[trev15]

cani ask you ? if you forget angle torque and 1/4 turn and you new 2 stage was 70n/m what would you tighten to on 3 stage final if you hat to ?

[winterheating]

cani ask you ? if you forget angle torque and 1/4 turn and you new 2 stage was 70n/m what would you tighten to on 3 stage final if you hat to ?

godknows they would all be different, thats why you just have to turn it quater of a turn....

[MrMPuk]

[trev15]

Thanks ,i dont understand it do i ? just not gettingit being 60 yrs old think i got sometimers, so what your saying is every bolt once in is dif, even thow same before in so once all tighten down to 70 then after that all diff [why] could it still work?

[winterheating]

i wouldnt worry sometimes the simplest of things are not understood easy as you would like.

mr puk will explain it better than me.

[trev15]

Thanks m8 for all your time and patience, think i got it now, all at start 70 then you go 1/4 turn so they could all be diff at finsh such as num 1 could be 98,n/m num 95n,m and so on think see why not tighten all same keep my fingers cross thanks again trev.

[trev15]

can i ask one more ? what worse can happen now , and is it possiable all be ok ?

[MrMPuk]

Cylinder could fill with water or oil and bend conrod. Could just breakdown on the motorway and be a real pain.

Now you know what you're doing just do it properly.

[winterheating]

yeah basically, once there at 70nm, then they just need a 1/4 turn, 90 degrees.
so if you were using a gauge type torque wrench the torque reading would have to reach a certain point to move the bolt again otherwise if torque kept rising there would be no movement of the bolt.

So thats why its best to keep all holes and threads clean, oiled and pref new bolts so each is as equall as possible.

so sounds like your bolts reached 90 odd to start them moving again. You must have moved them at least am 1/8 of a turn further??

are you using the type of torque wrench you set, or just an indicator one?

[trev15]

new one bought today tool station, set it 70nm then wait for clicks ,then set it to 98 nm thinking that would be 1/4 turn so all 98nm dont think over tight as a 1/4 turn is a long way i understand ive cock it up but going to put back to geather in morn fire up see if blue smoke gone if not got to take part do piston rings if all ok with smoke if head gasket goes have to do it again yrs a go we just crack them all up not fi car only old solid head never leak or got hot before so i let you know if you wont to trev.

[MrMPuk]

Good news is engines are cheap enough.

[winterheating]

ah that would of been better using a big bar then just to turn 1/4 like i say they normally get to a certain torque level then just turn.
if youve done them all equally at 98 did you notice how far they turned

i think if i were you, id take a chance and just turn each one equally 1/8 of a turn now....

[whitemice]

new one bought today tool station, set it 70nm then wait for clicks ,then set it to 98 nm thinking that would be 1/4 turn so all 98nm dont think over tight as a 1/4 turn is a long way i understand ive cock it up but going to put back to geather in morn fire up see if blue smoke gone if not got to take part do piston rings if all ok with smoke if head gasket goes have to do it again yrs a go we just crack them all up not fi car only old solid head never leak or got hot before so i let you know if you wont to trev.

MrMpuk is right, ie. you should not re-use stretch bolts because of fatigue possibility.

However they are only being re-used for the second time and not exactly stressed, certain manufacturers have stated that they can be re-used 3 times.

The main thing is to do what you have done and torque evenly in the correct sequence ignoring the 90 degree bit which is only necessary on new bolts.

98nm is a good figure to set them at as 90-110nm is common target.

Manufacturers only use stretch bolts to save money from hopefully eliminating re-torque during warranty, their factory machines whack them on between 45 and 180 degrees!

Old motors only run on good vibes anyway, i bet it will run brahma.