Re: FW: Stumble, miss & hesitate

[william mcintire <william.mcintire@wright.edu>]

John
I'll try to help you with the 'rock' business.

What it means is that the exhaust valve is closing
and the intake opening. This happens as the piston
nears and passes top dead center. This means the
cylinder is 180 deg out from firing - has just
expelled exhaust and will be sucking fresh air
fuel on the down stroke.

In your area of interest when #6 is on rock the
engine will be firing #1. Turn the engine over by
hand. Watch #6 and when one valve closes and the
other is opening you are there. It is called rock
because if you rotate the crankshaft first one way
and then the other the intake and ex. valve rocker
arms will rock back and forth. Valves can be
adjusted in this way. If 6 is on rock the engine
is firing #1 and both valves can be adjusted as
both valve lifters are on the back side of the
cam. The sequence is 1-6,2-5,3-4. When one of
these cyls is on rock the valves can be adjusted
on the other of the pair.

What you want to see is where the distributer
rotor is pointing when the engine is firing #1. Is
it pointing to where #1 should be n the normal
dist. rotation or is it pointing 180 deg. out. If
the rotor points the wrong way (to where 6 should
be) the dist. drive gear may be installed 180 out.

HTH
Bill
'70 6