Engine Troubleshooting - Linhai T-Boss 550 Service Manual

CHAPTER 3 ENGINE
3.7 TROUBLESHOOTING
GENERAL INFORMATION
TIP ______________
The following glide for troubleshooting does not
overall the possible causes of trouble. It should
be helpful, however, as a guide to basic trouble-
shooting. Refer to the relative procedure in this
manual for checks, adjustments, and replace-
ment of parts.
STARTING FAILURES
Engine
1. Cylinder and cylinder head
•
Loose spark plug
•
Loose cylinder head or cylinder
•
Damaged cylinder head gasket
•
Damaged cylinder gasket
•
Worn a damaged cylinder
•
Incorrect valve clearance
•
Improperly sealed valve
•
Incorrect valve-to-valve-seat contact
•
Incorrect valve timing
•
Faulty valve spring
•
Seized valve
2. Piston and piston ring(s)
•
Improperly installed piston ring
•
Damaged, worn a fatigued piston ring
•
Seized piston ring
•
Seized or damaged piston
3. Air filter
•
Improperly installed air filter
•
Clogged air filter element
4. Crankcase and crankshaft
•
Improperly assembled crankcase
•
Seized crankshaft
Fuel system
1. Fuel tank
•
Empty fuel tank
•
Clogged fuel tank breather hose joint
•
Clogged fuel tank breather hose joint hose
•
Deteriorated or contaminated fuel
2. Fuel pump
•
Faulty fuel pump
•
Faulty fuel injection system relay
•
Clogged or damaged fuel hose
3. Throttle body
•
Deteriorated or contaminated fuel
•
Sucked-in air
T-Boss550 SERVICE MANUAL20.0
Electrical system
1. Battery
• Discharged battery
•
Faulty battery
2 Fuse(s)
• Blown, damaged a incorrect fuse
•
Improperly installed fuse
a Sparkplug
• Incorrect spark plug gap
• Incorrect spark plug heat range
• Fouled spark plug
• Worn a damaged electrode
• Worn a damaged insulator
•
Faulty spark plug cap
4. Ignition coil
• Cracked a broken ignition coil body
• Broken a shorted primary or secondary
coils
• Faulty spark plug lead
5 Ignition system
•Faulty ECU
• Faulty crankshaft position sensor
• Broken generator rotor woodruff key
6 Switches and wiring
• Faulty main switch
• Broken a shorted wiring
• Faulty gear position switch
• Improperly grounded circuit
• Loose connections
•
Faulty brake light switch
7. Starting system
• Faulty starter motor
• Faulty starter relay
• Faulty starter clutch
INCORRECT ENGINE IDLING SPEED
Engine
1. Cylinder and cylinder head
• Incorrect valve clearance
•
Damaged valve train components
2 Air filter
• Clogged air filter element
Fuel system
1. Throttle body
• Damaged a loose throttle body joint
• Improper throttle cable free play
• Flooded throttle body
• Faulty air induction system
Electrical system
1. Battery
• Discharged battery
CHAPTER 3 ENGINE PAGE. 3- 136