Condenser; Coil; Ignition Resistance Wire; Distributor Repair - MerCruiser GM4 Service Manual

Condenser

1. Use Magneto Analyzer for test.
2. Test condenser for the following:
a. Condenser capacity test (.18-.25 mfd).
b. Condenser leakage and short test.
c. Condenser series resistance test.
3. Replace condenser if test results are not within
specifications.

Coil

1. Use Magneto Analyzer for test.
2. Check coil for the following:
a. Coil power test.
b. Coil surface insulation test.
c. Coil continuity test.
d. Primary resistance test.
e. Secondary resistance.
3. Replace coil if test results are not within specifica-
tions.

Ignition Resistance Wire

(ELECTRIC CHOKE)
1. Disconnect wire from positive (+) side of coil.
2. Unplug quick disconnect (with 2 wires) from elec-
tric choke heater element.
3. Connect ohmmeter leads to ends of discon-
nected wire. Replace resistor wire if reading is not
within specifications.
4. Reconnect wires to coil and choke.
5. Breaker Point Ignition Models: For instructions
on replacing resistor wire, refer to "Section 4, Part
E".
Index
4B - 8 - IGNITION SYSTEM

Distributor Repair

Removal

1. Disconnect distributor primary lead from coil ter-
minal.
2. Remove distributor cap and rotor.
IMPORTANT: If necessary to remove leads from
distributor cap, mark position on cap tower for
lead to number 1 cylinder. This will aid in installa-
tion of leads in cap.
3. Scribe a realignment mark on distributor in line
with rotor notch (located on distributor shaft).
4. Mark distributor housing in reference to engine
block.
5. Remove bolt and hold-down clamp and remove
distributor.
IMPORTANT: Avoid rotating engine with distribu-
tor removed, as ignition timing will be upset.
e
c
Breaker Plate And Attaching Parts
a - Rotor Alignment "Flat"
b - Breaker Plate
c-Breaker Point Attaching Screw
d - Condenser Bracket With Screw
e-Wire Terminal With Screw
a
d
b
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90-816462 2-695