Snowmobile Yamaha Phazer PZ50 (2007-2008 year). Manual - part 47

5-25

ENG

CAMSHAFTS

INSTALLATION

1. Install:

• Intake camshaft sprocket 1 

(with the special tool 2)

• Camshaft sprocket bolts

NOTE:

Make sure that the position to the cylinder #1 cam
a and marks b and c on the camshaft sprockets
are in the position shown in the illustration.
b: Exhaust side “—”
c: Intake side “—”
d: Cylinder #1 - cam

Rotor holding tool:

90890-01235, YU-01235

T

 

R

.

.

Camshaft sprocket bolt:

24 Nm (2.4 m · kg, 17 ft · lb)

c

a

c

a

b

b

2. Install: 

• Exhaust camshaft 1 
• Intake camshaft 2 

(with the camshaft sprocket)

Installation steps:

• Turn the crankshaft counterclockwise.
• When piston #1 is at TDC on the compression

stroke, align the TDC mark 

a on the A.C. mag-

neto rotor with the stationary pointer 

b on the

A.C. magneto cover.

• Install the timing chain onto both camshaft

sprockets, and then install the camshafts.

NOTE:

• When installing the timing chain, start with the

exhaust camshaft and be sure to keep the timing
chain as tight as possible on the exhaust side. 

• Make sure the marks 

d and e on the timing

chain sprockets are parallel with the edge of the
cylinder head. 

c: Exhaust side “—”
d: Intake side “—”
e: Cylinder #1 - cam

1

2

a

b

e

d c

e

c

d

5-26

ENG

CAMSHAFTS

3. Install:

• Dowel pins
• Intake camshaft cap
• Exhaust camshaft cap

NOTE:

Install the camshaft caps with the arrow mark 

a

pointing towards the right side of the engine.

4. Install:

• Camshaft cap bolts

NOTE:

Tighten the camshaft cap bolts in stages and in a
crisscross pattern, working from the inner caps out. 

CAUTION:

• Lubricate the camshaft cap bolts with the

engine oil.

• The camshaft cap bolts must be tightened

evenly or damage to the cylinder head, cam-
shaft caps, and camshafts will result. 

• Do not turn the crankshaft when installing the

camshaft to avoid damage or improper valve
timing. 

T

 

R

.

.

Camshaft cap bolt:

9 Nm (0.9 m · kg, 6.5 ft · lb)

a

a

5. Install:

• Timing chain tensioner gasket 1
• Timing chain tensioner 2 

NOTE:

• Be sure to install the timing chain tensioner gas-

ket so that its section with the “L” mark 

a is pro-

truding from the lower left side of the timing chain
tensioner.

• The arrow mark 

b on the timing chain tensioner

should face up.

6. Turn:

• Crankshaft

(several turns counterclockwise)

T

 

R

.

.

Timing chain tensioner bolt:

12 Nm (1.2 m · kg, 8.7 ft · lb)

b

L

a

New

5-27

ENG

CAMSHAFTS

7. Inspect:

• Timing chain
• Check that the timing chain is taut. If the chain

is slack, reinstall the timing chain tensioner.

NOTE:

If the engine is not disassembled, start the engine
and check for any abnormal noise. If any abnormal
noise is heard, reinstall the timing chain tensioner.

8. Turn:

• Crankshaft

(several turns counterclockwise)

9. Inspect:

• “I” mark 

a 

Make sure the “I” mark 

a on the A.C. mag-

neto rotor is aligned with the stationary pointer
b on the A.C. magneto cover.

• Timing chain sprocket marks 

c and d 

Make sure the marks 

c and d on the timing

chain sprockets are parallel with the edge of
the cylinder head. 
Out of alignment 

→ Adjust. 

Refer to the installation steps above.

10. Measure:

• Valve clearance 

Out of specification 

→ Adjust. 

Refer to “VALVE CLEARANCE ADJUST-
MENT” in CHAPTER 2.

a

b

d c

c

d

11. Install

• Cylinder head cover gasket
• Cylinder head cover

NOTE:

• Apply bond TB1541 1 onto the mating surfaces

of the cylinder head cover and cylinder head
cover gasket.

• Apply Yamaha bond No. 1215 2 onto the mating

surfaces of the cylinder head cover gasket and
cylinder head.

• Tighten the cylinder head cover bolts stages and

in a crisscross pattern.

T

 

R

.

.

Cylinder head cover bolt:

12 Nm (1.2 m · kg, 8.7 ft · lb)

1

2

New

5-28

ENG

CYLINDER HEAD

CYLINDER HEAD

Order

Job name/Part name

Q’ty

Remarks

Cylinder head removal

Remove the parts in the order listed below.

Engine

Refer to “ENGINE ASSEMBLY”.

Camshafts

Refer to “CAMSHAFTS”.

1

Timing chain guide (exhaust side)

1

2

Cylinder head

1

3

Cylinder head gasket

1

4

Dowel pin

2

For installation, reverse the removal proce-
dure.

New

New

4

4

3

2

1

(6)

È

É

E

10 Nm (1.0 m 

•

 kg, 7.2 ft 

•

 lb)

È:   

12 Nm (1.2 m 

•

 kg, 8.7 ft 

•

 lb)

É:   
Ê:

Specified angle 175 ~ 185˚

Final

25 Nm (2.5 m 

•

 kg, 18 ft 

•

 lb)

25 Nm (2.5 m 

•

 kg, 18 ft 

•

 lb)

1st

2nd

Ê