Yamaha F4B Service Manual page 58

TRBL
SHTG
Symptom 1: Improper oil lubrication.
Symptom 2
Oil cannot be seen
through the oil lubrica-
tion check window
Symptom 1: Discharged battery (optional for European market).
Symptom 2
—
Troubleshooting the lower unit
Troubleshooting consists of the following 3 items:
Symptom 1: Specific trouble conditions
Symptom 2: Trouble conditions of an area or individual part
Cause: Trouble causes of symptom 2
— : Not applicable
Symptom 1: Shift mechanism of the forward gear and reverse gear does not operate prop-
erly.
Symptom 2
—
4-3
Troubleshooting
Cause
Low engine oil level
Insufficient oil lubrication
Cause
Battery performance decrease Check the battery capacity and specific
Short, open, or loose connec-
tion in charging circuit
Lighting coil malfunction
Rectifier Regulator malfunction Measure the Rectifier Regulator output
Cause
Shift rod malfunction
Shift mechanism malfunction
(lower unit)
Checking step
Check the oil level.
Check for engine oil leakage.
Check the valve stem seal and valve.
Check the piston ring.
Check the oil pump.
Check the oil strainer.
Check the oil passage.
Checking step
gravity.
Check the battery cable and terminals
for proper connections.
Measure the lighting coil output peak
voltage.
Measure the lighting coil resistance.
peak voltage.
Check the Rectifier Regulator for conti-
nuity.
Checking step
Check the shift rod joint.
Check the shift rod for wear.
Check the dog clutch.
Check the forward gear, reverse gear,
and pinion for damage or wear.
See
page
10-3
2-13
7-27
7-41
7-23
7-25
2-13
See
page
—
—
5-4
5-4
5-4
5-4
See
page
8-16
8-6
8-9
8-9
8-11
8-11