Cooling System Leak Test; Inspection; Draining The System; Disassembly And Assembly - BOMBARDIER ski-doo Tundra Scandic 2004 Series Shop Manual

Section 04 ENGINE
Subsection 09 (LIQUID COOLING SYSTEM)

COOLING SYSTEM LEAK TEST

Install special radiator cap (P/N 529 021 400) in-
cluded in engine leak tester kit (P/N 861 749 100)
on coolant tank. Install hose pincher (P/N 295 000
076) on overflow hose. Using pump also included
in kit pressurize all system through coolant reser-
voir to 100 kPa (15 PSI).
Check all hoses and cylinder/base for coolant leaks.
Spray a soap/water solution and look for air bubbles.

INSPECTION

Check general condition of hoses and clamp tight-
ness.

DRAINING THE SYSTEM

WARNING
Never drain or refill the cooling system when
engine is hot.
To drain the cooling system, siphon the coolant
mixture from the coolant tank. Disconnect hose at
water pump to drain coolant from engine.

DISASSEMBLY AND ASSEMBLY

3,4, Sender and Plug
Apply Loctite 592 (P/N 413 702 300) thread sealant
on sender and plug to avoid leaks.
04-09-2
1, Pressure Cap
Check if the cap pressurizes the system. If not,
install a new 90 kPa (13 PSI) cap (do not exceed this
pressure).
5, Thermostat
To check thermostat, put in water and heat water.
Thermostat should start to open when water tem-
perature reaches the following degree. It will be
almost fully open at 50
ENGINE
593
Thermostat is a double action type.
a. Its function is to give faster warm up of the en-
gine by controlling a circuit; water pump —
engine — coolant tank. This is done by bypass-
ing the radiator circuit.
A16C02A
TYPICAL — CLOSED THERMOSTAT, COLD ENGINE
1. To reservoir
2. From cylinders
b. When the liquid is warmed enough, the thermo-
stat opens progressively the circuit, water pump
— engine — radiators — coolant tank to keep
the liquid at the desired temperature. (See the
diagram of the exploded view).
°C (122°F).
TEMPERATURE
42°C (108°F)
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2
MMR2004-118_04_09A.FM