Mercury MerCruiser MCM 454 Mag MPI Service Manual page 275

Table of Contents

SERVICE MANUAL NUMBER 23

1. Assemble piston to connecting rod using piston pin remover as shown. Follow instruc-

2. Once assembled, check piston for freedom of movement (back-and-forth and

3. If a new connecting rod has been installed, mark connecting rod and cap (on side of rod

PISTON RINGS

All compression rings are marked on upper side of ring. When installing compression rings,

make sure that marked side is toward top of piston.

Oil control rings are a three-piece type, consisting of two rings and a spacer.

1. Select rings comparable in size to cylinder bore and piston size.

2. Slip compression ring in cylinder bore, then press ring down into cylinder bore about 1/4

3. Measure gap between ends of ring with a feeler gauge as shown.

4. If gap between ends of ring is below specifications, remove ring and try another for fit.

5. Fit each compression ring to cylinder in which it is going to be used.

90-861326--1 MARCH 1999

Downloaded from

https://needmanual.com/

tions supplied with kit.

Piston Pin Remover (J-24086-C)

up-and-down) on connecting rod. Piston should move freely in all directions. If it does

not, piston pin bore is tight and piston/pin assembly must be replaced.

and cap with slots for connecting rod bearing tangs) with cylinder number in which it will

be installed.

in. (6 mm) (below ring travel). Be sure that ring is square with cylinder wall.

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

Chapters

Table of Contents