greiswig wrote:
greiswig wrote:
At the very least I would check torque on the bolts you have. Some of mine seemed to be sitting there at about 80lb/ft.
To try to reduce the risk of sowing disinformation, I'm going to challenge my own statement here. Given what Geordi has found regarding the lack of yield on at least some of the factory bolts, it makes me wonder whether re torquing the factory bolts that presumably were torqued into their elastic range in the first place...whether or not that makes sense?
And, if a guy were NOT in a position to buy the studs, there are plenty of us out here who probably have a set of brand new factory bolts that we would probably sell pretty cheap. Would replacing with those one at a time do anything good? Other than perhaps doing the job more carefully than JoeBob at the he factory?
you're on the right path here.. engineers KNOW what the bolt will relax to after 'x' amount of cycles.. and still have 'x' amount of elasticity. That's how they come up with the original torque setting. re-torqueing to factory specs with a 'used' bolt... I kinda squirm a little here. Do we know what the original bolt was supposed to do? ie 'have x amount of elasticity' to deal with the aluminum head... which upon retorqueing to full value again, blows that out of the water? I have several big diesels that get 320 ft lbs on the head torque several times rebuilding/freshening in the past 40 yrs... Next time will probably see new bolts. (for that engine, $2800) Not looking forward to that day!
More and more engines these days are using 'one time only' type fasteners..
Me? I'd go either new oem each time the head is off, or go with the studs if needing a fastener for several tear downs/rebuilds.
LOL, "JoeBob" is probably 'Vincent' Antonio, 'Dino' Fredo..