Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Instruction - part 59

 

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Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Instruction - part 59

 

 

5-73

ENG

CRANKCASE

INSTALLATION

1. Install:

• Crankshaft journal upper bearing

(into the upper crankcase)

• Crankshaft journal lower bearing

(into the lower crankcase)

NOTE:

• Align the projections 

a on the crankshaft journal

bearings with the notches 

b in the crankcase.

• Be sure to install each crankshaft journal bearing

in its original place.

2. Lubricate:

• Crankshaft pins
• Connecting rod inner surface

(with the recommended lubricant)

Recommended lubricant:

Engine oil

3. Install:

• Top ring 1 
• 2nd ring 2 
• Upper oil ring rail 3 
• Oil ring expander 4 
• Lower oil ring rail 5 

NOTE:

Be sure to install the piston rings so that the manu-
facturer’s marks or numbers 

a face up.

4. Install:

• Piston 1 

(onto the respective connecting rod 2)

• Piston pin 3 
• Piston pin clip

NOTE:

• Apply engine oil onto the piston pin.
• Make sure that the “Y” mark 

a on the connecting

rod faces left when the punch mark 

b on the pis-

ton is pointing up. Refer to the illustration.

• Reinstall each piston into its original cylinder

(numbering order starting from the left: #1 to #3).

Y

2

1

3

4

a

b

New

5-74

ENG

CRANKCASE

5. Offset:

• Piston ring end gaps

a Top ring
b 2nd ring
c Upper oil ring rail
d Oil ring expander
e Lower oil ring rail
È Exhaust side

6. Lubricate:

• Piston
• Piston rings
• Cylinder

7. Lubricate:

• Bolt threads
• Nut seats

(with the recommended lubricant)

8. Lubricate:

• Crankshaft pins
• Big end bearings
• Connecting rod inner surface

(with the recommended lubricant)

Recommended lubricant:

Engine oil

Recommended lubricant:

Molybdenum disulfide grease

Recommended lubricant:

Engine oil

be

c

ad

90˚

90˚

45˚

È

5-75

ENG

CRANKCASE

9. Install:

• Big end bearings
• Connecting rod assembly 1 

(into the cylinder and onto the crankshaft pin).

• Connecting rod cap

(onto the connecting rod)

NOTE:

• Align the projections on the big end bearings with

the notches in the connecting rods and connect-
ing rod caps.

• Be sure to reinstall each big end bearing in its

original place.

• While compressing the piston rings with piston

ring compressor 2, install the connecting rod
assembly into the cylinder with the other hand.

• Make sure that the “Y” marks 

a on the connect-

ing rods face towards the A.C. magneto.

• Make sure that the characters 

b on both the con-

necting rod and connecting rod cap are aligned.

10. Align:

• Bolt heads

(with the connecting rod caps)

Piston ring compressor:

90890-05158, YM-08037

5-76

ENG

CRANKCASE

11. Tighten:

• Connecting rod bolts

• Replace the connecting rod bolts with new

ones.

CAUTION:

Tighten the connecting rod bolts using the
plastic-region tightening angle method. Always
install new bolts.

Tightening steps:

• Clean the connecting rod bolts.
• Tighten the connecting rod bolts.
• Put a mark 

a on the corner of the connecting

rod bolt 1 and the connecting rod 2.

• Tighten the connecting rod bolt further to reach

the specified angle (120 ~ 130°).

WARNING

When the bolt is tightened more than the speci-
fied angle, do not loosen the bolt and then
retighten it.
Replace the bolt with a new one and perform
the procedure again.

CAUTION:

• Do not use a torque wrench to tighten the bolt

to the specified angle.

• Tighten the bolt until it is at the specified

angles.

12. Lubricate:

• Crankshaft journal bearings

(with the recommended lubricant)

T

 

R

.

.

Connecting rod bolt:

1st: 20 Nm (2.0 m · kg, 14 ft · lb)
Final: Specified angle 120 ~ 130°

Recommended lubricant:

Engine oil

 

 

 

 

 

 

 

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