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#1
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Help needed - vacuum leak, need retorquing intake manifold on M117
I have reason to believe my new intake manifold gaskets are leaking vacuum. I torqued them to 20 ft/lbs, and am seeing seepage around #3 cylinder. Vacuum gauge reads 1/6 off fully pegged position at idle (700 rpm), timing is set right but as ROM's climb, the vacuum advance goes out of whack (35+ degrees BTDC around 2000-2500 rpm, rather than the specified 25 degrees). I thought it was maybe a faulty fuel injector seal, but don't think that one injector seal could cause that big a drop, could it? All injectors/seals/insulators are new, BTW.
What is the correct torque spec and sequence for manifold gaskets, I read it is 18-22 ft/lbs. Should I set to 22 or slightly higher like 24-25 to "re-seal" the gaskets? When I did the job, I started with the center bolts and did it outward alternating between sides. I suspect when I removed 1 or 2 of the bolts in that area of the leakage to change bolts to a new one AFTER torquing it in that it did not "reseal" after the initial 20 ft/lbs then back at 20 ft/lbs. Can I do one side starting from the center then outward, alternating, and then do the other side when done? I did alternating outward between both sides when I first put them on. Any suggestions? Thanks! |
#2
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I can't find the torque spec anywhere but it sounds like you are in the ball park. The sequence, I would think, should be in a circular pattern starting from the middle and working out. I WOULD NOT go above the recommended spec on an alloy engine. I always hold my breath as it is when tighening anything down on these.
It has been my experience (for what that is worth) that once the gasket starts to leak, there usually is no saving it. The vacuume leak could be the problem with your timing advance. For some reason the CD is about worthless on the intake. Hope you get it fixed.
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