Message text written by Hugh Fader
>I have seen statments like "If you trust your TDC mark" on the lists. So,
I
checked TDC on my crank pulley and discovered that it occurs when the
pointer is at 2 BTDC. I also see a slot cut into the mark at 4 deg ATDC. I
have a new crank. I assume that someone, maybe the factory, calibrated the
pulley to the old crank at 4 deg ATDC and that is what the slot is for.
<
Hugh, The TDC marks are on the outer pulley which is attached to the
center part by a layer of rubber (this is the harmonic dampner part). I
have been told of incidences where the outer part will rotate in relation
to the center due to failure of the bond of the rubber.
Like I said, I've been told of the outer part rotating. I have experienced
such a failure on an Escort and when that happened the outer part tried to
walk off the center part destroying the belt in the process. I can't tell
you if the outer part rotated or not but I am inclined to think that if
there is a failure in the rubber bond you will have more severe
concequences than the TDC mark being out of place.
Dave
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