Inspection And Repair; Reassembly - Volvo Penta D65A MS Workshop Manual

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Inspection and repair

Stator
1. Testing the stator coil for open circuits
If there is no continuity among the three lead
wires, replace the stator.
2. Testing the stator coil for grounding
If there is continuity between the coil and core,
replace the stator.
Field coil
Measure resistance between the terminals of the field
coil. If the measured resistance deviates from the
standard value, replace the coil.
Field coil resistance, Ω Ω Ω Ω Ω
Assembly Standard ... 7.3–8.6
Inspecting rectifier
To check individual diodes, measure resistance be-
tween the diode lead wire and heat sink. Connect the
positive (+) test lead wire to the diode and measure
resistance. Then, connect the negative (-) test lead
wire to the diode and measure resistance again. If
both measured values are close to 0 (zero), the cir-
cuit is shorted.
NOTE! If the diode has an open circuit or is shorted, it
is defective, and the rectifier must be replaced.

Reassembly

Reassembly sequence
8 9 10 11
4 5
WARNING! The alternator requires no grease.
Keep the bearing box free of oil and grease since oil
and grease can cause creeping of the bearing on the
rear side.
WARNING! Heat the bearing box of the rear
bracket for assembly.
Group 30 Electrical System
7 6
3
2 1
211