Thunderbolt IV Ignition Module
Distributor Repair
IGNITION MODULE MOUNTED ON EXHAUST
ELBOW
Removal
1.
Unplug wiring harness connector from ignition
module.
1. Unplug wiring harness from ignition module on
distributor housing, or disconnect wires from igni-
tion module mounted on exhaust elbow. Discon-
nect sensor wires.
2.
Remove fasteners and hardware retaining igni-
tion module to exhaust elbow. Remove module.
2.
Remove distributor cap. Do not remove high ten-
sion leads unless necessary.
NOTE: Do not disturb spacers between ignition mod-
ule plate and exhaust elbow, unless replacing
spacers.
3. Crank engine over until timing marks line up and
rotor is pointing toward No. 1 cylinder on distribu-
tor cap.
IMPORTANT: BLACK ground (–) wire from engine
harness must be placed under ignition module
fastener when mounting module.
4. Mark distributor housing in reference to engine
block.
3.
Replace ignition module using existing hard-
ware. Tighten fasteners securely. Be certain
BLACK ground (–) wire is in position.
5. Remove bolt and hold-down clamp and remove
distributor.
4.
Check that terminals of wiring harness connector
are clean and free of corrosion. Plug connector
into ignition module.
IMPORTANT: To simplify distributor installation,
do not turn crankshaft when distributor is re-
moved from engine.
IGNITION MODULE MOUNTED ON
DISTRIBUTOR
1.
Unplug wiring harness connector from ignition
module.
2.
Remove stainless steel screws retaining ignition
module to distributor body. Remove module.
IMPORTANT: Thermalconductive Grease must
be applied to the back of the ignition module to
conduct heat away from the module and to pre-
vent corrosion.
3.
Apply a thin coat of Thermalconductive Grease
evenly across the metal back of the ignition mod-
ule.
4.
5.
Install ignition module using the stainless steel
screws. Torque screws to 10 lb. in. (1.1 N·m).
Check that terminals of wiring harness connector
are clean and free of corrosion. Plug connector
into ignition module.
Index
4B-8 - IGNITION SYSTEM
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you