Tohatsu MFS 25 — connecting Rod Bolts & Crank Pin Clearance: Technical Specs & Measurement [166/319]

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5-50

Power Unit

25/30 2006

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 ]

6. Tighten connecting rod bolts in two steps to specified torque.

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.

3. Install crankshaft on the cylinder block.

4. Place plasti-gauge 3 on each crank pin 4 parallel to

crankshaft.

5. Install connecting rod and cap 2 to crank pin 4.

Do not attach piston rings.

Do not place plasti-gauge 3 on the oil hole of

crank pin 4.

Do not move connecting rod and crankshaft until

oil clearance measurement is completed.

• 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.

Crank Pin Oil Clearance :

0.010 to 0.036 mm ( 0.00039 to 0.00142 in )

Functional Limit :

0.060 mm ( 0.00236 in )

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.

mm in

b Plasti-gauge

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