Section 01 ENGINES (1503 4-TEC)
Subsection 03 (PTO HOUSING AND MAGNETO)
Withdraw rotor no. 19 with trigger wheel no. 20.
1
R1503motr53A
2
3
1
TYPICAL
1. Hexagonal screws
2. Rotor
3. Trigger wheel
Inspection
Check rotor, bent teeth and trigger wheel condi-
tion. If damaged, replace faulty part.
To check the trigger wheel for bent teeth, proceed
as follows.
Install a dial indicator on crankcase casting. Po-
sition the gauge on a tooth and set it to zero (0).
Rotate flywheel and check needle movement.
Themaximumalloweddifferencebetweenteeth
is 0.15 mm (.006 in). Otherwise, straighten the
tooth or replace the trigger wheel.
2
R1503motr177A
1
1. Trigger wheel
2. Dial indicator
Properly reinstall cover.
Installation
For installation, reverse the removal procedure.
However, pay attention to the following.
Trigger wheel position has to be located with the
location pin on the crankshaft gear.
Apply Loctite 243 (P/N 293 800 060) on threads.
Torque rotor screws to 24 N•m(17lbf•ft).
RING GEAR
Removal
Lock crankshaft with locking tool (P/N 529 035
821). Refer to CYLINDER BLOCK section.
Remove:
– PTO housing cover
– hexagonal screws no. 18.
Withdraw rotor no. 19, trigger wheel no. 20 and
starter ring no. 21.
1
R1503motr54A
2
3
4
TYPICAL
1. Hexagonal screws
2. Rotor
3. Encoder wheel
4. Ring gear
Inspection
Check ring gear condition, especially teeth condi-
tion. If damaged, replace faulty part.
Installation
For installation, reverse the removal procedure.
However, pay attention to the following.
Ring gear and trigger wheel position has to be lo-
cated with the location pin on the crankshaft gear.
smr2005-032 37
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