Volvo Penta D65A MS Workshop Manual page 204

Group 30 Electrical System
204
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Armature
Measuring the armature runout
Measure the runout with a dial gauge. If the deflection
exceeds the assembly standard, repair or replace the
armature.
Armature deflection, mm [in.]
Assembly Standard ... 0.05 [0.00197]
Inspecting the commutator
1. Check the condition of the commutator surface. If
it is rough, polish it with #400 to #600 sandpaper.
Check the commutator for runout with a dial
gauge. Replace the commutator if the deflection
exceeds the service limit.
Commutator deflection, mm [in.]
Assembly Standard ... 0.06 [0.0024] maximum
Service Limit ............. 0.10 [0.0039]
2. Measure the mica depth. Use a depth gauge to
measure the depth of each mica undercut. If the
depth exceeds the repair limit, re-condition the
mica.
Commutator mica depth, mm [in.]
Assembly Standard ... 0.7 to 0.9 [0.028–0.035]
Repair Limit ............... 0.2 [0.0079]
Testing the armature
1. Use a growler to test the armature for short cir-
cuits. If the hacksaw blade vibrates against the
core, replace the armature.
2. If there is continuity between the commutator and
shaft, replace the armature.