In a message dated 9/16/2010 2:47:32 P.M. Eastern Standard Time,
msteitle@gmail.com writes:
I was curious, have you verified that the timing mark you believe to be
TDC is actually TDC? I recall it being mentioned before that you can't
rely on the timing marks on the pulleys as sometimes pulleys get swapped from
one engine to another and may not match up correctly. I feel it is worth
checking. Lynn H. has described how to locate TDC (check archives).
Basically, you remove the leading plug on #1 rotor, rotate crank until
you see an apex seal in the center of the hole, put a mark on the flywheel
(use a temporary pointer for a reference point). Then reverse rotation
until you see another apex seal in the center of the hole, put a 2nd mark on
the flywheel. Now split the difference between the two marks and that
should be TDC. Check that it matches the mark on your pulley.
Mark S.
MMMM, that would be real close, However.
Remove all of the spark plugs.
Turn the engine in the direction of normal rotation until you can see an
apex seal in the center of the trailing plug hole of the number one rotor
housing. The rotor housing furthest from the prop. The upper plug
is the trailing plug.
Removing the plug will reveal the hole.
Mark a flywheel starter tooth under your temporary pointer. Use welding
wire or a coat hanger for a pointer, so you can bend it as needed. It needs to
be well mounted and snug.
Once you have marked the tooth under the pointer with a paint drop, or
chalk, or scrap of tape, do not move the pointer any more.
turn the engine backwards about 30 degrees, looking into the leading
plug hole for the next apex seal to come to the center of the hole. The leading
plug hole is the one on the bottom of the number one rotor housing. Once you
have that apex seal centered make a second mark on a flywheel tooth or valley
between teeth, whatever is under the pointer.
Half way between those two marks, make a third mark. This mark will be the
TDC mark, accurate to about a degree. Clean the tooth with a fine file and paint
it red. Count the teeth on the flexplate/flywheel.
Let us say that you find 106 teeth. divide 360 by 106 and get 3.39 degrees
per tooth. So, for a timing mark at 24 degrees (for example) you would count off
7 teeth while turning the engine backwards. Mark whatever is under
the pointer a different color than red. Make it bright like white or
yellow. You can move the red dot back under the pointer. Remove the wire
pointer and make up a permanent pointer to point at the red mark. So long as the
engine is not turned during this process, all will be well. If you install
more than one timing mark stamp what each is for on the spacer plate, with the
correct paint dot by each line.
Use only a clip on inductive timing light. clipped onto the leading plug
wire of the number one rotor housing.
Lynn E. Hanover