Doosan D20S-5 Operation & Maintenance Manual page 134

Operation Section
HARD START
Checks
Engine Mechanical
Checks
Exhaust System
Checks
Important: The LPG Fuel system is more sensitive to intake manifold leakage than
the gasoline fuel supply system.
Check for the following:
• Vacuum leaks
• Improper valve timing
• Low compression
• Improper valve clearance.
• Worn rocker arms
• Broken or weak valve springs
• Worn camshaft lobes.
Check the intake and exhaust manifolds for casting ash.
Check the exhaust system for a possible restriction:
• Inspect the exhaust system for damaged or collapsed pipes.
• Inspect the muffler for signs of heat distress or for possible internal failure.
Check for possible plugged catalytic converter. Refer to Restricted Exhaust System
Diagnosis.
Action
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