Mercury MerCruiser MCM 7.4L MPI User Manual

4
B
IGNITION SYSTEM
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 4B-1
ELECTRICAL SYSTEM
Section 4B - Ignition System
Table of Contents
Specifications 4B-2. . . . . . . . . . . . . . . . . . . . . . .
Tools 4B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubricants / Sealants / Adhesives 4B-2. . . . .
Torque Specifications 4B-2. . . . . . . . . . . . . . . .
Ignition Control System Components 4B-3. .
General Precautions 4B-3. . . . . . . . . . . . . .
EFI System Maintenance Precautions 4B-3
Spark Plugs 4B-4. . . . . . . . . . . . . . . . . . . . . .
Spark Plug Wires 4B-6. . . . . . . . . . . . . . . . .
Distributor Cap 4B-7. . . . . . . . . . . . . . . . . . .
Distributor Assembly 4B-8. . . . . . . . . . . . . .
Ignition Coil 4B-12. . . . . . . . . . . . . . . . . . . . . .
Ignition Timing 4B-13. . . . . . . . . . . . . . . . . . . . . .
Checking/Adjusting 4B-13. . . . . . . . . . . . . . .
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Index

Mercury MerCruiser MCM 7.4L MPI Specifications

General

Engine Type	V8
Bore	4.25 in (108 mm)
Compression Ratio	8.6:1
Ignition System	Electronic Ignition
Alternator	65 Amp
Displacement	7.4L (454 cu in)
Fuel System	Multi-Port Fuel Injection (MPI)
Horsepower	310 HP
Torque	450 lb-ft
Cooling System	Closed Cooling
Fuel Requirement	87 octane (minimum)
Stroke	4.00 in (101.6 mm)