Inspection Of Crank Pin Oil Clearance - TOHATSU MFS25 Service Manual

Power Unit

33) Inspection of Crank Pin Oil Clearance

1. Clean connecting rod.
2. Place cylinder block upside down on the work bench. Install
piston to connecting rod 1.
Do not attach piston rings.
3. Install crankshaft on the cylinder block.
Place plasti-gauge 3 on each crank pin 4 parallel to
4.
crankshaft.
Do not place plasti-gauge 3 on the oil hole of
crank pin 4.
Install connecting rod and cap 2 to crank pin 4.
5.
• Be sure that individual cap is installed to their
original connecting rod.
• Check that "UP" mark b of connecting rod is
directed to crankshaft flywheel side.
6. Tighten connecting rod bolts in two steps to specified torque.
Do not move connecting rod and crankshaft until
oil clearance measurement is completed.
Connecting Rod Bolts :
First Tightening Torque : 6 N·m ( 4 lb·ft ) [ 0.6 kgf·m ]
Final Tightening Torque : 12 N·m ( 9 lb·ft ) [ 1.2 kgf·m ]
7. Remove connecting rod cap and measure width of crushed
plasti-gauge on each crank pin. Replace connecting rod or
crankshaft if the width is over specified value.
Crank Pin Oil Clearance :
0.010 to 0.036 mm ( 0.00039 to 0.00142 in )
Functional Limit :
0.060 mm ( 0.00236 in )
5-50
1
2
2
!
b
mm in
b Plasti-gauge
a
1
5
3
4
25/30 2006