Water Pump Belt Tension; Oil Pump Adjustment; Weight Construction - Polaris INDY TRAIL RMK Service Manual

Water Pump Belt Tension -

700 and 800 Domestic big block Twins.
The water pump belt on 600 RMK, 700 RMK and 800
RMK domestic big block twin snowmobile engines
should be inspected every 1500 miles. Belts should be
inspected by measuring the width at several locations
around the belt. Belt width at any location should not be
thinner than .250² (6.35mm). Replace the belt if you no-
tice any loose cords, broken cracked or missing cogs,
and variations in width. If the water pump belt fails, seri-
ous engine damage could result. Nominal thickness of
a new belt should be approximately .345² (8.75mm).
Check belt tension by rotating crankshaft 1/8 turn at a
time. The tension should be equal at all points of rota-
tion.
1. A weight is needed to test belt deflection. Construct a
weight out of wire and weights such as thick washers.
Use the illustration to assist you . The finished weight
should weigh 2 lbs.
2. Measure the belt deflection using the following
procedure:
a. Hang weight midway between pulleys. Weight
must hang free and not rest on any part of ma-
chine.
b. Lay a straight edge or straight piece of stiff materi-
al (steel is suggested) across the top of both pul-
leys. The straight edge should measure approxi-
mately 1/8² x 8² x 1².
c. Measure the gap between the belt and the
straight edge at the point where the weight is
hanging.
d. Measured distance must be between .1² and
.25². If the measured distance is more than the
specification, try another waterpump belt.
NOTE: Do not use tools to assemble belt on pulleys.
Damage can occur which could shorten belt life. Before
installing new belt, check pulley teeth, remove all foreign
material, dirt, and oil. Never install a used belt on a differ-
ent engine. Install belt so writing on the belt can be read
from the right side of the machine.

Oil Pump Adjustment

Refer to Chapter 3 for oil pump adjustment procedures.
MAINTENANCE / TUNE UP
Replace if width is less than .25²
(6.35mm). Nominal new width is
.345² (8.75mm).

Weight Construction

Wide Enough
to Span Belt
Weight should equal 2 lbs.
Hang Weight Here
.062² to .090²
Wire Suggested
2.7