TOHATSU MFS 25D Service Manual page 211

41) Inspection of Crank Pin Oil Clearance
1. Clean the connecting rod and metal bearings. Re-install
the metal bearings.
Install the piston 1 to the connecting rod 2 .
2.
• Install the piston so that the piston "O" mark a
and connecting rod "UP" mark b are located at
the positions shown in the diagram.
• The piston should be installed without piston
rings.
Place the mark a of the piston on the flywheel side c, set
3.
the connecting rod assy in the piston slider 3 , and install
the assy in the cylinder.
• Before installing, apply molybdenum grease
and then 4-stroke engine oil to the piston outer
surface, and then apply 4-stroke engine oil to
the piston slider.
• Clean and remove piston carbon.
Piston Slider 3 :
P/N. 3AC-72871-0
4. Install the crankshaft on the cylinder block.
5. Place the Plastigauge 4 in each crank pin 5 so that it is
parallel to the crankshaft.
Do not place the Plastigauge on the oil hole of the
crank pin.
6. Install the connecting rod and connecting rod cap 6 in the
crank pin.
• Be sure that each cap is installed on its original
connecting rod.
• Check that the "UP" mark on the connecting rod
cap is facing the crankshaft flywheel side.
7. Tighten the connecting rod bolts in two steps to the
specified torque.
Do not move the connecting rod and crankshaft
until the oil clearance measurement is completed.
Connecting Rod Bolts:
First Tightening Torque: 6 N·m (4 lb·ft) [0.6 kgf·m]
Second Tightening Torque: 10 N·m (7 lb·ft) [1.0 kgf·m]
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