Transmission
MT-2
Tightening Torque
Trouble Shooting
Abnormal noise
Check the abnormal noise from transmission to determine if it happens during driving or gear shifting, which is
one of the factor to the trouble shooting. Also, find out this abnormal noise comes from gear or bearing.
Gear engagement is difficult
When gears of transmission are difficult or tend to disengaged, you must consider that is failure of control system
that the transmission inside mehanism is isolated from the gear shift lever to gear shift fork.
When there is failure of transmission engagement, the problem maybe caused by malfunctioning synchronizer
and this kind of problems normally occur at the certain speed, as 2
nd
speed or 3
rd
speed.
Item
Tightening Torque （Nm）
Clutch housing connecting bolt 137~167
Fasten nut of propeller shaft connecting flange 200~220
Transmission upper cover fixed bolt and nut 33~44
Transmission cover fasten bolt 20~26
Reversing lamp switch and neutral position switch 20
Countershaft rear bearing locking nut 200~300
Reverse gear shaft locking plate bolt 20~26
Oil drain scew and filler port screw 120~140
Propeller shaft connecting bolt and nut 215~245
Midship mounting bolt and nut 160~220
Trouble Cause Correction
Abnormal
sound or
noise
· Viscosity of lubricating oil too low
· Lubricating oil insufficient
· Gear teeth cracked or worn out (clearance too large)
· Bearing worn out or broken
· Engaging position of shift fork and gear incorrect
· Synchronizer worn out or damaged
· Some gears broken
· Use suitable lubricating oil
· Add it to required level
· Repair or replace the part
· Replace the bearing
· Check shift fork, replace it if its twist
· Replace
· Clean, replace
Trouble Cause Correction
Difficulty
in shifting
Control system
· Operating level deformed
· Gear select or shift flexible shaft length incorrect
· Adjust operating lever
· Adjust flexible shaft length
Transmission
· Bearing worn out or damaged
· Malfunctioning of synchronizer
· Gear select and shift rocker welding point loosened
· Fork deformed or damaged
· Shift lever come out from groove
· Malfunctioning of gear shift rocker bolt
· Fork stopping screw loosened
· Replace bearing
· Replace synchronizer
· Weld, repair
· Check, adjust or replace
· Assemble or replace parts
· Replace bolt
· Tighten, lock
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