Yamaha F25 - Bracket Unit; Lower Unit

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1
Lower unit
Bracket unit
Part to be tightened Screw size
Tightening torques
N·m kgf·m ft·lb
Check screw — 9 0.9 6.6
Drain screw — 9 0.9 6.6
Lower case mounting bolt M10 37 3.7 27.3
Propeller nut — 34 3.4 25.1
Propeller shaft housing bolt M6 11 1.1 8.1
Pinion nut — 50 5.0 36.9
Water inlet cover screw M5 1 0.1 0.7
Lower case mounting bolt (high thrust model) M10 39 3.9 28.8
Propeller shaft housing bolt (high thrust model) M8 16 1.6 11.8
Part to be tightened Screw size
Tightening torques
N·m kgf·m ft·lb
Self-locking nut — 37 3.7 27.3
Throttle grip screw M5 3.5 0.35 2.58
Engine shut-off switch nut — 2.5 0.25 1.84
Friction plate bolt M5 4 0.4 3.0
Self-locking nut — 4 0.4 3.0
Alert indicator screw M6 4 0.4 3.0
Flushing hose adapter screw ø6 5 0.5 3.7
Self-locking nut — 24 2.4 17.7
Upper mount bolt M8 26 2.6 19.2
Lower mounting nut — 54 5.4 39.8
Grease nipple — 3 0.3 2.2
Lower mount housing bolt
(S-transom model)
1st
M8
14 1.4 10.3
2nd 24 2.4 17.7
Lower mount housing bolt (L-transom model) — 54 5.4 39.8
Baffle plate screw M5 2 0.2 1.5
Upper case bolt
1st
M8
21 2.1 15.5
2nd 21 2.1 15.5
Baffle plate screw (high thrust model) M5 3 0.3 2.2
Upper case plug (high thrust model) — 17 1.7 12.5
Engine oil drain bolt — 27 2.7 19.9
Exhaust manifold bolt M6 10 1.0 7.4
Exhaust manifold bolt (high thrust model) M6 11 1.1 8.1
Stud bolt — 20 2.0 14.8
Friction piece bolt M6 3.9 0.39 2.88
Tilt stopper plate nut — 24 2.4 17.7
Tilt lever screw M5 4 0.4 3.0
Self-locking nut — 45 4.5 33.2
Stopper nut (PTT model) — 36 3.6 26.6
Trim sensor cam screw (high thrust model) M6 2 0.2 1.5
Special tightening torque