Mercury MerCruiser MCM 454 Mag MPI Service Manual page 512

SERVICE MANUAL NUMBER 23
CLEANING AND INSPECTION
IMPORTANT: DO NOT use cleaners containing methyl ethyl ketone. It is not neces-
sary for cleaning throttle bore and valve deposits.
IMPORTANT: DO NOT allow the TP sensor and IAC valve to come into contact with
solvent or cleaner.
IMPORTANT: Use care when removing gasket material from plenum and throttle
body. Failure to do so could result in damage to the plenum and throttle body.
1. Carefully remove all gasket material from plenum and throttle body.
2. Thoroughly clean all parts of throttle body. Make certain that all passages are free of dirt
3. Inspect mating surfaces for damage that could affect gasket sealing.
4. Inspect throttle body for cracks in casting.
5. Inspect throttle plates, linkage, return springs, etc., for damage, wear and foreign
6. Check plenum for loose parts and foreign material.
INSTALLATION
NOTE: To prevent difficult removal of fasteners and damage to fastener heads, do not use
a higher strength thread locking compound than recommended.
1. Connect TP sensor and IAC electrical connectors, then install throttle body with new
Index
90-861326--1 MARCH 1999
Downloaded from https://needmanual.com/
and burrs.
material.
gasket, using four throttle body mounting studs.
a - Throttle Body
b - Throttle Position (TP) Sensor
c - Idle Air Control (IAC) Valve
d - Sight Tube
MULTI-PORT FUEL INJECTION DISASSEMBLY AND REASSEMBLY
b
a
c
d
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