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TOHATSU MFS 4 Service Manual

TOHATSU MFS 4
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9-2
Troubleshooting
O
K
4st 4/5/6 2011
1. Troubleshooting List
   
○○
Fuel level is low in the tank.
○○○○ ○○○
Fuel system connection is incomplete.
○○○○ ○○○
Air suctioned through fuel system.
○○○○ ○○○
Fuel pipe is twisted.
○○○○ ○○○
Air vent screw is closed.
○○○○ ○○○
Fuel filter, fuel pump or carburetor is clogged.
○○ ○○○
Low quality engine oil
○○○○ ○○○
Low quality gasoline
○○ ○○
Engine oil level is too high.
○○
Engine oil lacks. (Oil warning lamp is lit.)
○○○○
Fuel is fed excessively.
○○○○ ○○○
Carburetor is maintained poorly.
○○
Oil pump malfunction.
○○○○ ○○○
Use of spark plugs not specified
○○○○ ○○
Spark plug carbon deposit or bridge
○○○○ ○○
No sparks or weak spark
Stop switch short-circuited
○○○○ ○○
Ignition timing is not properly adjusted.
(
Ignighteor, valve timing
)
Stop switch lock is not in place.
Disconnection of lead wires or loose earth wire.
○○○○ ○○
Valve clearance is wrong.
○○○
Cylinderhead sealing is defective.
○○○○ ○○
Valve seat sealing is defective. (Intake and exhaust)
○○○○ ○○
Piston, piston ring and/or cylinder is worn excessively.
○○
Combustion chamber excessive carbon deposits.
○○ ○○
Spark plug is loose.
○○
Coolingwaterisnotfedorlowduetomalfunctionorcloggingofpump.
○○
Thermostat operation is defective.
○○ ○○
Anti-cavitation plate is damaged.
○○○○○
Use of mismatched propeller.
○○○○○○
Propeller is damaged or deformed.
○○ ○○
Thrust rod position is not correct.
○○○○○
Boat is unbalanced by load position.
○○○○○
Transom installation height is too high or too low.
○○○○ ○○
Throttle link adjustment is defective.
 
   
 
  
 
  
   
   
!  
   
"  
  
  
MFS4-5-6Ech09110422.qxd 11.4.22 7:00 PM ページ2

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TOHATSU MFS 4 Specifications

General IconGeneral
BrandTOHATSU
ModelMFS 4
CategoryOutboard Motor
LanguageEnglish

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