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I4 Head Bolt Torque Cooling System Over Pressure
Posted by jeff02 (# 89) (more from jeff02) on Sun, 22 Jan 2012 20:40:51
In Reply to: Re: 99 9-5 V6 Wagon headgasket and oil leak?! Worth fixing?, AdamSAAB2kAero, Sun, 22 Jan 2012 09:55:57
Yep, I did them one at a time from center to outside. Set them at about 45-50 ft/lbs and then I go to about 95 ft/lbs from center to outside after all are in with new bolts, but if the torque stops at about 80-90 and you can feel it not get tighter then stop. So I end up with something around 85-95 ft/lbs on all. I use a very old non-digital torque wrench.

Fixes (not guaranteed) the "cooling system over pressure" problems on two i4's so far. One 99 i4 LPT and one 01 i4 HPT.

I would consider this a preventative service for all 99-00-01 (02-03 maybe). At least check the current torque and if they are under, say, 70 would replace. One had all < 60 and would not tighten up past that. I have a few more 9-5's LPTs that I will have to check soon.

Some have said that there was a problem from the factory on head bolt torque amount.

I have never done this on a V6 yet.

Any others see the same thing?

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