MerCruiser 350 MAG MPI Owner's Manual

Section 5 - Maintenance
90-864197070 JUNE 2007 Page 75
7. While holding the adjustment stud at the correct belt tension, tighten the
16 mm (5/8 in.) locking nut.
a
b
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a - 8 mm (1/16 in.) adjusting stud b - 16 mm (5/8 in.) locking nut
8. Operate the engine for a short period of time and recheck the belt adjustment.
Flushing The Power Package—Tow Sports
The Boat Out of the Water
IMPORTANT: Flushing the power package is most effective when performed with the boat
out of the water.
IMPORTANT: Flushing is needed If the engine package has been operated in salty,
brackish, mineral‑laden or polluted water. For best results flushing is recommended after
each outing and before cold weather and extended storage.
!
WARNING
Rotating propellers can cause serious injury or death. Never operate the boat out of the
water with a propeller installed. Before installing or removing a propeller, place the drive
unit in neutral and engage the lanyard stop switch to prevent the engine from starting.
1.
Models with Walter V-Drive Transmissions:
a. Close the seacock, if equipped, and then disconnect the seawater inlet hose from
the transmission seawater inlet fitting.
b. If not equipped with a seacock, disconnect the seawater inlet hose from the
transmission seawater inlet fitting and plug the seawater inlet hose.
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c. Using appropriate connector, connect the flushing water hose to the transmission
seawater inlet fitting.

MerCruiser 350 MAG MPI Specifications

General

Engine Type	V8
Horsepower	300 HP
Ignition System	Electronic ignition
Alternator	65 amp
Compression Ratio	9.4:1
Displacement	5.7L (350 cu in)
Fuel System	Multi-Point Injection (MPI)
Bore x Stroke	4.00" x 3.48" (101.6mm x 88.39mm)