Table of Contents
Page
Page
Thunderbolt IV Ignition System . . . . . . . . . . . . . 4B-1
Identification . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-1
Replacement Parts Warning . . . . . . . . . . . . . . . 4B-1
Thunderbolt IV (HEI) Electronic Ignition
Thunderbolt IV Ignition Timing . . . . . . . . . . . . 4B-13
Thunderbolt V Ignition System . . . . . . . . . . . . 4B-14
Identification . . . . . . . . . . . . . . . . . . . . . . . . . 4B-14
General Description . . . . . . . . . . . . . . . . . . . . . 4B-15
Idle Speed Spark Control . . . . . . . . . . . . . . 4B-15
Acceleration Spark Advance . . . . . . . . . . . 4B-15
Mean-Best-Timing (MBT) Spark Advance 4B-15
Over-Speed Control . . . . . . . . . . . . . . . . . . . 4B-15
Knock Retard Spark Control . . . . . . . . . . . 4B-15
Thunderbolt V Spark Control Graph . . . . . . . 4B-16
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . 4B-17
Ignition Control Module . . . . . . . . . . . . . . . . 4B-17
Knock Control Module . . . . . . . . . . . . . . . . . 4B-17
Ignition Control System Timing Lead . . . . 4B-17
Ignition System Wiring Diagram . . . . . . . . . . . 4B-18
Timing and Idle Adjustment Procedures
For Thunderbolt V Ignition . . . . . . . . . . . . . . . 4B-19
Setting Base Ignition Timing . . . . . . . . . . . . 4B-19
Adjusting Idle Mixture . . . . . . . . . . . . . . . . . 4B-19
Adjusting Engine Idle Speed . . . . . . . . . . . 4B-19
Troubleshooting Thunderbolt V Ignition . . . . . 4B-20
Ignition Control Module /Coil
/Distributor . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-20
Knock Control Module . . . . . . . . . . . . . . . . . 4B-21
Spark Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-22
Spark Plug Wires . . . . . . . . . . . . . . . . . . . . . 4B-23
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-1
Torque Specifications . . . . . . . . . . . . . . . . . . 4B-1
Tools/Lubricants/Sealants . . . . . . . . . . . . . . . 4B-1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-2
Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-2
Spark Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-2
Firing Order . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-2
Distributor Advance Curves . . . . . . . . . . . . . 4B-3
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-5
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-5
Distributor Cap . . . . . . . . . . . . . . . . . . . . . . . . 4B-5
Rotor/Sensor Wheel . . . . . . . . . . . . . . . . . . . 4B-6
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-7
Thunderbolt IV Ignition Module . . . . . . . . . . 4B-8
Distributor Repair . . . . . . . . . . . . . . . . . . . . . . . . 4B-8
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4B-8
Thunderbolt IV Exploded View . . . . . . . . . 4B-10
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . 4B-11
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . 4B-11
Distributor Installation . . . . . . . . . . . . . . . . . . . . 4B-12
Engine Not Disturbed . . . . . . . . . . . . . . . . . 4B-12
Engine Disturbed . . . . . . . . . . . . . . . . . . . . . 4B-12
NOTICE
For information and procedures on trouble-
shooting, refer to Section 1C.
Index
44B-0B - IG- NIGNITIONITION SYSYSTEMSTEM
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!
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This book is invaluable if you do your own repairs. Great book.
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