Westerbeke 65A-FOUR - Page 41

STARTER MOTOR SERVICE
Brush Wear
1. If the contact face of the brush is dirty or dusty, clean it with
emery paper.
2. Measure the brush length (A) with vernier calipers.
3. If the length is less than the allowable limit, replace the yoke
assembly and brush holder.
Factory spec.
18.0mm
0.7086 in.
Brush
length CA)
Allowable limit
t t.O mm
0.433t in.
Armature Coil
1. Check the continuity across the commutator and armature coil
core with an ohmmeter.
2. If it conducts, replace the armature.
3. Check the continuity across the segments of the commutator
with an ohmmeter.
4. If it does not conduct, replace the armature.
Commutator
Infinity
Resistance
Armature coil core
Commutator segment OQ
Overrunning Clutch
1. Inspect the pinion for wear or damage.
2. If there is any defect, replace the overrunning clutch assembly.
3. Check that the pinion turns freely and smoothly in the
overrunning direction
and does not siip in the cranking
direction.
4. If the pinion slips or does not rotate in the both directions,
replace the overrunning clutch assembly.
Brush Holder
1. Check the continuity across the brush holder and the holder
support with an ohmmeter.
2. lfit conducts, replace the brush holder.
Resistance
Brush holder -Holder
support
Infinity
Engines & Generators
35
A BRUSH lENGTil
INSPECTING THE ARMATURE COIL
INSPECTING
THE OVERRUNING CLUTCH