BOMBARDIER DS 650, Руководство по ремонту

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Section 03 ENGINE
Subsection 02 (TROUBLESHOOTING)
03-02-10
VMR2004_006_03_02A.FM
Test/Inspection 7. Melted and/or perforated piston dome; melted section at ring end gap.
a. When piston reaches TDC, mixture is ignited by heated areas in combustion
chamber. This situation is due to an incomplete combustion of a poor oil quality.
Clean residue accumulation in combustion chamber and replace piston. Use
Bombardier recommended oil.
b. Spark plug heat range is too high.
Install recommended spark plug (refer to TECHNICAL DATA).
8. Piston color is dark due to seizure on intake and exhaust sides.
a. Cooling system leaks and lowers coolant level.
Tighten clamps or replace defective parts. Add antifreeze in cooling system until
appropriate level is reached.
9. Cracked or broken piston.
a. Cracked or broken piston due to excessive piston/cylinder clearance or engine
overreving.
Replace piston. Check piston/cylinder clearance (refer to CYLINDER AND HEAD).
10. Check piston rings and cylinder surface for grooves.
a. Poor oil quality.
Use Bombardier recommended oil.
b. Contamination (like sand) through engine intake.
Replace defective part(s) and use new air filter.
11. Check crankshaft movement.
a. Oil pump failure due to leak of oil.
Repair and replace defective parts and use Bombardier recommended oil.
b. Oil contamination due to clogged oil filter/oil sieve. Oil passes through bypass valve
Replace oil, replace defective part(s) (refer to MAINTENANCE CHART).
12. Check valve springs exhaust/inlet.
a. Broken valve spring damages the cylinder head, valve(s), rocker arm(s)/piston/
piston rings and conrod.
Replace defective part(s).
13. Check if fuel supply is too less at high RPM.
a. Fuel line is contaminated and/or bent.
Clean and/or replace defective part(s).
SYMPTOM ENGINE SUDDENLY TURNS OFF.
CONDITION NORMAL USE.