Mike Ross wrote:
I'm stumped. I just bought a GT6 that ran great until I accidentally
and unknowingly rotated the distributor because the P.O. didn't have
it bolted tightly. It took me three days to figure out why the car
didn't run right; the timing had been screwed up. When I tried to
reset it I discovered that the T.D.C. marking on the pulley didn't
line up with the pointer when the #1 cylinder was at Top Dead Center.
In fact, it lined up about 2 1/2 inches in circumference before the
T.D.C. mark on the pulley. If I tried to set the timing anywhere
near the pulley mark, the engine would not run at all. If I rotated
the distributor so that the engine sounded smooth, it lined up at
about the same point 2 1/2 inches around the pulley circumference
before the T.D.C. mark.
This engine has been rebuilt. He claims it was blue printed, bored 30
over, with new rings and pistons, crank polished, head milled ,
complete valve job, rocker shaft, new guides, rod bearings, main
bearings, and fast cam.
Mike:
My answers are:
1) could the front pulley have been installed so that it no longer
coincides with the T.D.C. mark.
NO, THE PULLEY IS KEYED TO THE CRANK. THE KEYWAYS WOULD HAVE HAD TO BE
MACHINED OUT OF PLACE AT THE FACTORY. THAT IS UNLIKELY.
2) since I no longer can use the pulley markings, do I set the timing
just by sound and feel?
USE A TDC INDICATOR AND REMARK YOUR PULLEY. DID HE PUT A SPIT TIMING COVER ON
A GT6 ENGINE? NO, I DON'T KNOW IF THE POINTER LOCATIONS ARE DIFFERENT.
3) one other thing I noticed when using a remote starter, with the
coil unplugged, to turn the pulley. The pulley seemed to move forward
a lot more than I remember ever seeing before. This was during a
short crank of the engine to get the pulley to turn just a little bit.
It seemed to move forward at least 1/4 inch. Is this normal.
IS THE PULLEY NUT TIGHT?
HAVE SOMEONE DEPRESS THE CLUTCH PEDAL WHILE YOU WATCH THE PULLEY. IF IT MOVES
MORE THAN A FEW THOU, YOUR THRUST WASHERS ARE BAD. IF IT REALLY MOVES 1/4"
YOUR BLOCK AND CRANK ARE DAMAGED
One final note. It was late and I was tired but, I used one of those
whistle tubes attached to the spark plug opening to find when the
cylinder was at T.D.C.. This time, it seemed that the pulley lined up
about 2 1/2 inches AFTER the T.D.C. mark. Maybe I'm just burnt out
messing with this.
CAN'T HELP YOU THERE. SORRY.
Jason
GT6+
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