Mercury MerCruiser MCM 454 Mag MPI Service Manual page 272

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454 CID (7.4L) / 502 CID (8.2L)

Disassemble piston from connecting rod using piston pin remover as shown. Follow instruc-

tions supplied with kit.

Cleaning and Inspection

CONNECTING RODS

1. Wash connecting rods in cleaning solvent and dry with compressed air.

2. Check for twisted and bent rods and inspect for nicks and cracks. Replace damaged

connecting rods.

NOTE: Cylinder bore and taper must be within specifications before pistons can be consid-

ered for re-use.

1. Clean varnish from piston skirts with a cleaning solvent. DO NOT WIRE BRUSH ANY

PART OF PISTON. Clean ring grooves with a groove cleaner and make sure oil ring

holes are clean.

2. Inspect piston for cracked ring lands, skirts and pin bosses, wavy worn ring lands,

scuffed or damaged skirts, and eroded areas at top of piston. Replace pistons which are

damaged or show signs of excessive wear.

3. Inspect grooves for nicks and burrs that might cause rings to hang up.

4. Measure piston skirt and check clearance as outlined under "Piston Selection."

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Piston Pin Remover and Installer Kit (J-24086-C)

Connecting Rod

SERVICE MANUAL NUMBER 23

90-861326--1 MARCH 1999

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