Mariner Mercury 105/140 JET, Service Manual

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90-824052R3 JUNE 2002 POWERHEAD - 4A-33
Powerhead Reassembly and
Installation
General
Before proceeding with powerhead reassembly, be
sure that all parts to be re-used have been carefully
cleaned and thoroughly inspected, as outlined in
“Cleaning and Inspection,” preceding. Parts, which
have not been properly cleaned (or which are
questionable), can severely damage an otherwise
perfectly good powerhead within the first few minutes
of operation. All new powerhead gaskets MUST BE
installed during reassembly.
During reassembly, lubricate parts with Quicksilver
2-Cycle Outboard Lubricant whenever “light oil” is
specified. Quicksilver part numbers of lubricants,
sealers and locking compounds and tools are listed
in “Powerhead General Information,” preceding.
A torque wrench is essential for correct reassembly
of powerhead. DO NOT attempt to reassemble
powerhead without using a torque wrench. Attaching
bolts for covers, housings and cylinder heads MUST
BE torqued by tightening bolts in 3 progressive steps
(following specified torque sequence) until specified
torque is reached (see “Example,” following).
EXAMPLE: If cylinder head attaching bolts require a
torque of 40 Ib. ft. (54.0 N·m), a) tighten all bolts to
10 Ib. ft. (13.5 N·m), following specified torque
sequence, b) tighten all bolts to 20 Ib. ft. (27.0 N·m),
following torque sequence, then finally c) tighten all
bolts to 40 Ib. ft. (54.0 N·m), following torque
sequence.
1. If removed, press lower crankshaft ball bearing
onto crankshaft as shown. Be sure bearing is
pressed firmly against counterweight.
d
c
b
a
51852
a - Crankshaft
b - Crankshaft Ball Bearing
c - Suitable Mandrel
d - Press
2. Reinstall retaining ring using a suitable pair of
Snap Ring Pliers.
51854
a
a - Retaining Ring