PURSUIT OS 255, Owner'S Manual

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1-2
Section 1 Propulsion Systems
OS 255
Change the oil at regular intervals according
to the owner’s manual instructions. Use only
the type of oil specified by the engine manu-
facturer.
2-Cycle Engines
Check the engine oil level before each use
by checking the gauge in the helm or visu-
ally checking the oil level using the reference
marks on the tanks.
An oil injection system lubricates 2-cycle
engines.
Use only the type of oil specified by the
engine manufacturer to maintain proper oil
level.
Refer to the engine owner’s manual for oil
specifications and additional information on
the oil injection system. Refer to the Fuel
System chapter.
1.4 Engine Cooling System
Outboard engines use raw water (seawater)
to maintain proper operating temperatures.
Water inlets allow coolant water pump to cir-
culate cooling water through the engine
block. Used coolant water releases with the
exhaust gases through the propeller hub.
The water pump uses a small impeller made
of synthetic rubber. The impeller and water
pump cannot run dry for more than a few
seconds without damage occurring. In most
outboard motors, some cooling water diverts
through ports below the engine cowling. This
allows visual inspection of the cooling sys-
tem. With the engine running, always check
for a steady stream of water coming out of
these ports.
If using the boat in salt or badly polluted
water, flush the engines after each use.
Refer to the engine owner’s manual for the
proper engine flushing procedure.
1.5 Propellers
Propellers convert the engine’s power into
thrust. They come in a variety of styles,
diameters and pitches. The one that will best
suit the needs of your Pursuit will depend
somewhat on your application and expected
load average.
Two numbers stamped on the prop in
sequence identify propeller sizes. The 1
st
number in the sequence (for example 14 x
21) is the diameter of the propeller, and the
2
nd
number is the pitch.
The theoretical distance traveled by the pro-
peller for each revolution is the pitch.
Always repair or replace a propeller immedi-
ately if damaged. A damaged, therefore out
of balance propeller, can cause a noticeable
vibration in the boat and can damage the
engine gear assembly. Refer to the engine
owner’s manual for information on propeller
removal, repair or replacement instructions.
1.6 Engine Instrumentation
The helm station is equipped with a set of
engine instruments and alarms. Instruments
allow the operator to monitor the engines’
operational conditions. Close observation of
these instruments allows the operator to use
the engines efficiently and can prevent
costly damages. The instrumentation is
unique to the type of outboard motors
installed on your Pursuit. Some or all of the
following gauges may be present.
!
NOTICE
Always monitor the oil level and only
use the type of oil specified by the
engine manufacturer.
!
CAUTION
Never run an outboard motor without
water flowing to the water pump. Seri-
ous damage to the water impeller or
engine can occur.