BOMBARDIER ski-doo Tundra Scandic 2004 Series, Shop Manual

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Section 03 TROUBLESHOOTING
Subsection 02 (ENGINE)
03-02-8
MMR2004-106_03_02A.FM
SYMPTOM HIGH ENGINE OPERATING TEMPERATURE.
CONDITION NORMAL USE.
Test/Inspection Fan-Cooled Engines
1. Check cooling system.
a. Loose fan belt.
Adjust or replace fan belt (refer to AXIAL FAN COOLING SYSTEM).
b. Dirty cooling fins or blocked air ducts.
Clean.
2. Check carburetion.
a. Improperly adjusted or inadequate carburetor components.
Adjust according to specifications (refer to TECHNICAL DATA) or replace
inadequate component(s).
3. Check cylinder head gaskets.
a. Worn gaskets.
Replace.
4. Check ignition timing.
a. Ignition timing is too advanced.
Adjust according to specifications (refer to TECHNICAL DATA).
5. Check if there are leaks at air intake silencer and/or engine crankcase.
a. Leak(s).
Repair or replace.
6. Check condition and heat range of spark plugs.
a. Melted spark plug tip or inadequate heat range.
Replace.
Liquid-Cooled Engines
1. Check temperature gauge sensor.
a. False reading.
Check terminal connections. If problem persists, replace sensor.
2. Check coolant level and check if there is air infiltration in the system or if there
are leaks in gasket areas.
a. Low coolant level or air in system.
Add coolant until recommended level is reached, bleed system and/or tighten
clamps.
3. Check if coolant flows through system properly.
a. Foreign particles and/or broken coolant pump impeller.
Clean cooling system and/or replace coolant pump impeller.
4. Check thermostat.
a. Thermostat reacts slowly or not at all.
Replace.