1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16

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
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1993, 1994, 1995, 1996, 1997
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(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.
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1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 SKU UPC Model
Nick on Aug 13, 2018. Exactly what I was looking for!

Hugely helpful service manual! Perfect. Thank you!


Sonthaya Traipug on May 04, 2018. Freelance Yachts Service

Manuals are all Important for Technician


Glenn on Dec 02, 2015. Nice

This book is invaluable if you do your own repairs. Great book.


Joseph on Oct 04, 2015. 1997 7.4l Bravo

Could not find a copy until a search brought me here.
Excellent print.
Thank you


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