THUNDERBOLT IV AND V IGNITION SYSTEM - 4B-190-823225--1 1096
Thunderbolt IV Ignition
System
Identification
71790
DISTRIBUTOR WITH IGNITION MODULE
MOUNTED ON EXHAUST ELBOW
72722
a
DISTRIBUTOR WITH IGNITION MODULE
MOUNTED ON DISTRIBUTOR BODY
a - Ignition Module
NOTE: Except for ignition module replacement, re-
pair procedures for both distributors are the same.
Replacement Parts Warning
!
WARNING
Electrical, ignition and fuel system components
on your MerCruiser are designed and manufac-
tured to comply with U.S. Coast Guard Rules and
Regulations to minimize risks of fire and explo-
sion.
Use of replacement electrical, ignition or fuel
system components, which do not comply with
these rules and regulations, could result in a fire
or explosion hazard and should be avoided.
Thunderbolt IV (HEI)
Electronic Ignition System
Torque Specifications
Fastener Location In. Lb. Ft. Lb. N·m
Distributor Clamp 20 27
Spark Plugs (14 mm) 15 20
Ignition Module
Retaining Screws
(Stainless Steel)
10 1.1
Tools/Lubricants/Sealants
Description Part Number
Timing Light 91-99379
Multi-Meter / DVA 91-99750
Torch Lamp 91-63209
Insulating Compound 92-41669--1
Quicksilver Liquid
Neoprene
92-27511-2
Loctite 271
Thermalconductive
Grease
Obtain Locally
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