QuestionQUESTION: Hi there. I recently installed some engine guards on my 2007 S50, and I had to remove the exhaust headers and then replace them when finished... but, in the instructions, it didn't say what to torque the bolts to when I'm done. I don't want to have them back out, or, crack the engine.. Can you help me?
Thanks.
ANSWER: Ross,
bolt torque goes mainly by the size
of the bolt. The specs would be 16-18 ft-lbs.
I would favor the lower end of these specs
and maybe recheck them after a day or two.
---------- FOLLOW-UP ----------
QUESTION: Is this the same for all bolts?? I also had to remove the bottom motor mount bolt and replace it with the one they supplied. The factory installed bolt was VERY tight and took a 1.5 foot wrench to crack it... I hope that bolt was to be done up very tight... Also, I used red thread locker on everything, because I don't plan on removing this guard, ever.. I hope that's OK to. I never know if I should use blue or red. I usually use blue.
AnswerRoss,
Torque is mainly dictated by the bolt sizes.
6mm bolt = 6-9 ft/lbs.
8mm bolt = 12-16 ft/lbs.
10mm bolt = 20-25 ft/lbs.
Just tighten in small increments
until all are torqued.
Retorque after running if possible.
-Red thread locker is more permanent
and sometimes requires heat to remove.
-some of the bigger longer motor mount
bolts are tightened to 50-60 ft-lbs originally,
the next smaller ones at 30 ft-lbs and the smallest
8mm ones at about 18 ft-lbs.
-a higher grade bolt can take more torque which may
account for the higher than average specs.
