Mercury MerCruiser MCM 454 Mag MPI Service Manual page 274

454 CID (7.4L) / 502 CID (8.2L)
Reassembly
IMPORTANT: Reassembly of pistons and connecting rods require adherence to the
following steps.
7.4L Engine
454 Mag / 502 Mag / 8.2L
Index
Page 3A-70
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Piston and pin are machine fitted to each other and must remain together as a
matched set. Do not intermix pistons and pins.
If original pistons and/or connecting rods are being used, be sure to assemble
pistons and connecting rods so they can be reinstalled in same cylinder from
which they were removed.
Connecting rod bearing tangs are always toward outside of cylinder block.
a - Rod Bearing Tangs
Notch or valve relief in piston must be positioned correctly for engine that is
being repaired.
a - Notch - Toward Front Of Engine
a - Valve Relief - Toward Center Of Engine
SERVICE MANUAL NUMBER 23
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