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I tightened them to spec (which I don't remember off the top of my head).
My small torque wrench broke, and I used my 1/2" torque wrench and the spec was way down in the low range for it.
I currently have a poorly running motor that had good vacuum at idle and poor vacuum at part throttle above idle. If I overtighted the rocker arms could it be possible that the valves are hanging open a bit causing the poor vacuum?
The engine does not have a blocked exhaust - verified with back pressure gauge in the o2 sensor port.
A few things make me think this cannot be the case:
-The first that it has good vacuum idle (around 38kpa), and idle is stable
-The second that the rocker arms are fixed to the pedestals so it seems no matter how much you torque them down once the pedestal is bottomed out against the head it will not pull the rocker down any further. So, I think overtorquing can't cause a valve to hang open when it should be closed
-If I didn't torque them enough I'd be hearing tapping
anyways, I'm going nuts trying to figure out why I have such poor manifold vacuum at cruising speeds (2000 rpm and less than 35% throttle the MAP sensor indicates NO manifold vacuum at all) and it is missing gobs of torque.
My small torque wrench broke, and I used my 1/2" torque wrench and the spec was way down in the low range for it.
I currently have a poorly running motor that had good vacuum at idle and poor vacuum at part throttle above idle. If I overtighted the rocker arms could it be possible that the valves are hanging open a bit causing the poor vacuum?
The engine does not have a blocked exhaust - verified with back pressure gauge in the o2 sensor port.
A few things make me think this cannot be the case:
-The first that it has good vacuum idle (around 38kpa), and idle is stable
-The second that the rocker arms are fixed to the pedestals so it seems no matter how much you torque them down once the pedestal is bottomed out against the head it will not pull the rocker down any further. So, I think overtorquing can't cause a valve to hang open when it should be closed
-If I didn't torque them enough I'd be hearing tapping
anyways, I'm going nuts trying to figure out why I have such poor manifold vacuum at cruising speeds (2000 rpm and less than 35% throttle the MAP sensor indicates NO manifold vacuum at all) and it is missing gobs of torque.