sc400 torque head bolts and then turn 90 Degree???
#1
sc400 torque head bolts and then turn 90 Degree???
Hello,
I have a 1997 sc400 and i was told to torque the head bolts at 29 lbs and then turn them 90 Degrees??? Is that true?? I've never heard of that. I would think you torque to specs and that's it! please help, because i want to get it right.
Dave
I have a 1997 sc400 and i was told to torque the head bolts at 29 lbs and then turn them 90 Degrees??? Is that true?? I've never heard of that. I would think you torque to specs and that's it! please help, because i want to get it right.
Dave
#3
the extra 90 is for the bolt's torque-to-yield setting which stretches the bolt a bit and gives it maximum clamping force that no torque setting can properly match. The downside to this is you have to replace the head bolts every time they are removed as the bolt is stretched to it's max. Hopefully you're using new head bolts... good luck
#4
the extra 90 is for the bolt's torque-to-yield setting which stretches the bolt a bit and gives it maximum clamping force that no torque setting can properly match. The downside to this is you have to replace the head bolts every time they are removed as the bolt is stretched to it's max. Hopefully you're using new head bolts... good luck
#5
Im told by my buddy/factor lexus tech/supra guy. that they (lexus) never change the factor head bolt, unless they fail to meet torque specs/ or fail period durning install. I was going to buy all new ARP studs & he told me that it was a waist of money, that my factor studs would be just fine. I had no problem doing my 1.3uzfe build with the same studs. The vvt-i torque specs are are even higher 44lbs. Here is a couple of pics of the 430 repair manual for your viewing pleasure. Dont use the torque spec but the sequence should be the same.
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