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Thanks, new knowledge filed away.Yes.
So it should look like a faint cross hatch rather than glass smooth right?
Thanks, new knowledge filed away.Yes.
Thanks, new knowledge filed away.
So it should look like a faint cross hatch rather than glass smooth right?
new knowledge for me too!! - thanks!
what do you use to get that faint cross hatch effect? - thats what a reboring machine is for?
Cool thanks
or how did you tighten head ?
I was wondering about your torque wrench calibration, which was why I asked how it came apart. Other than a faulty torque wrench, did you use grease on the head bolts or is there a chance that the wrong (new) bolts were used? (Apart from the fact that you should never use grease on any bolt that's going to be torqued, I wondered if grease had caused the bolts to stop hydraulically).
If you lubricate the threads then you will overtorque the bolts by something like 30% or so. The torque that you apply is mainly used to overcome thread friction, obviously if you lubricate the thread then the friction is reduced and the bolt will therefore be at a higher loading than it would be if unlubricated. Something like 80 to 90% of the torque you apply is to overcome the thread friction, it is the remaining 20 or 10% torque that produces the actual clamping force.Torque wrench was last calibrated about 12months ago but only used a dozen times or so since. head bolts were brand new and all the same sizes as came out originally. Now here comes the crunch bit I think, I used ARP head bolt lubricator on the bolts thinking this was the right thing to use, possibly not it may seem?
just out of interest did you properly drain the block before taking the head off to stop the threaded holes in the head filling up with coolant when you split the head? Cos that would give false readings when you try and tighten the bolts back up
Block was fully drained and bolt holes blown out with compressed air.
I have just refitted the head before the rain has come and I have hand screwed the bots all in to the head (what a ball ache that was) them removed them given the holes another blow out with air then have fitted them with a tiny drop of molyslip on them and have again torqued to 30flb ft and then angle tightened them by 60 degrees twice. I just hope it works this time.
If you don't lube them properly the initial 30 lb ft torque will not take them down far enough. It may leave them a flat or so short of where they should be before the two sixties. And then the two sixties will leave the bolts short of tension. I usually apply the initial torque leave for a time then go over them a couple of times. You would be surprised how many snug up more. Then do the angle tighten.
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