Mercury Optimax 150 User Manual

POWERHEAD
90-855347R1 JANUARY 1999 Page 4A-11
Crankshaft, Pistons and Connecting Rods
REF.
TORQUE
REF
.
NO.
QTY. DESCRIPTION lb-in lb-ft Nm.
1 1 CRANKSHAFT ASSEMBLY
2 1 BALL BEARING (LOWER)
3 1 RETAINING RING
4 1 CARRIER ASSEMBLY
5 1 SEAL
6 7 RING–sealing
7 2 ROLLER BEARING
8 2 RACE
9
3 PISTON (STARBOARD)
9
3 PISTON (PORT)
10 1 PISTON RING
11 12 LOCK RING
12 6 CONNECTING ROD ASSEMBLY
13 12 SCREW
1st Torque: 15 lb-in
2nd Torque: 30 lb-ft
Turn Screw addition-
al 90° after 2nd
torque
14 12 WASHER
15 6 ROLLER BEARING ASSEMBLY
16 174 NEEDLE BEARING–piston end
Torque Sequence
CRANKCASE COVER BOLTS (AND TORQUE SEQUENCE)
1
2
3
4
5
6
78
a
b
a-Add light oil to threads and bolt face: 8 Bolts (3/8 in. - 16 in.)
38 lb. ft. (51.5 N·m)
b-Bolts (5/16 in. - 18) 180 lb. in. (20 N·m)

Mercury Optimax 150 Specifications

General

Horsepower	150 HP
Engine Type	V6
Alternator Output	60 amp / 756 watt
Starting	Electric
Steering	Remote
Displacement	2.5 L
Fuel Induction System	2-Stage Direct Fuel Injection (DFI)
Shaft Length	20", 25"
Dry Weight	431 lbs (20 in), 439 lbs (25 in)