Assembly Of Power Unit Parts - TOHATSU MD 70-90C2 Service Manual

Power Unit

28) Assembly of Power Unit Parts

Install main bearing (upper) 1 to crank shaft ass'y.
1.
• Face the marking on the bearing to flywheel
side.
• Apply LIT grease to the oil seal lip.
2st OIL
2st
LIT
LIT
2. Install crank shaft ass'y to cylinder.
Apply genuine engine oil to the following parts before
assembling them.
· Big End of Connecting Rod
· Small End of Connecting Rod
· Main Bearing
· Piston Ring and Entire Circumference of Piston, and
Entire Cylinder Wall
· O Ring of Upper Bearing
• Before assembling parts, remove residual
gasket on the surface of bearings and mating
surfaces of crankcase halves.
• When installing crank shaft ass'y, lower the
ass'y gradually so that crank shaft is held
parallel with the cylinder face.
• Insert pistons one by one while confirming that
each piston enters vertically in the cylinder
liner. Pistons can be inserted easier while
moving them up and down a little.
• Put a piece of round bar or pipe 3 of ø19 mm
(0.75 in) in the drive shaft opening to make it
easier to hold.
2st OIL
2st
3. Positioning bearing
Put the pin of bearing (lower) on the cylinder and then, put
washers 7 in the cylinder grooves snugly.
Bring seal ring gap a to crank case side center.
4.
Before completely assembling crank shaft parts,
position the bearing, washer and seal rings
properly.
5-42
LIT
LIT
2 2
3 3
6
7
7
1
2st
2st OIL
1 1
6
a
TLDI 75/90C2 2010