Piper PA-24 Comanche Service Manual page 380

PIPER COMANCHE SERVICE MANUAL
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JP"!I..--------
TIMING MARKS
FIGURE 7A·21. ENGINE TIMING MARKS
g.
Turn
on the timing licht SVritc:b.
h. Rotate the magneto housing in the direction of the mapet roution a few dqrees until the timing
light comes on. Then slowly tum macncto in opposite directioa until the timing IiIbt goes OUt. Secure the
magneto housing
in
this position.
NOTE
Some timing lighu operate the opposite of the one mentioned.
i. Rotate the crankshaft opposite norma! rotation wuil it is approximately 3S dqrecs BTC on
compression stroke So. one cylinder.
NOTE
The crankshaft should not be rotated more than 10 dqrecs in direction
opposite normal rotation from the %5 dqrce BTe as the pawL on the
impulse couplinl (.Z1 macnetos) will enpp with the stOp pin and late
tuning will be indicated throUlh the impulse coupling mechanism. If this
should happen. rotate crankshaft in normal direction until sharp click is
heard; this will indicate that the impubc couplinJ has pused through
firing position. Tum crankshaft in direction opposite normal rotation to
approximately 35 dqrees
~TC
and proceed with
riminJ
check.
POWER PLANT
REVISED: 4/10/81
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