Snowmobile Arctic Cat (2007 year). Instruction - part 36

 

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Snowmobile Arctic Cat (2007 year). Instruction - part 36

 

 

3-22

ZJ094A

2. Remove the four cap screws securing the engine

cover to the cylinder head; then remove the

cover and account for the two locating pins from

the intake side of the cylinder head.

ZJ104A

3. Using Drive Clutch Spanner Wrench (p/n 0644-

136), rotate the engine two full revolutions.

„ NOTE: Rotating the engine two full revolutions
will ensure that any oil trapped in the tappet/shim
is purged to maintain an accurate clearance read-
ing.

4. Rotate the engine until the camshaft lobe of the

valve being measured is directly away from the

tappet.

5. Using an appropriate thickness gauge, measure

and record the intake and exaust valve clearance

of the cylinder that is on the compression stroke;

then rotate the engine 360° and measure and

record the valve clearance of the other cylinder.

Valve clearance must be within specifications.

ZJ105

„ NOTE: When measuring valve/tappet clearance
on the outer exhaust valves, rotate the engine until
the decompression pin (A) is deactivated. 

ZJ109C

„ NOTE: At this point if valve/tappet clearances are
within specifications, proceed to step 20. If any
valve/tappet clearance is not within specifications,
proceed to steps 6-19.

6. After identifying the valve/tappet clearances

that are out of specification, loosen the tensioner

adjuster bolt (A); then remove the two Allen-

head cap screws (B) securing the tensioner

adjuster to the cylinder head.

ZJ106A

„ NOTE: Do not remove the tensioner adjuster bolt
until the tensioner assembly is removed from the
cylinder head to avoid internal components from
falling into the engine compartment.

Valve Clearance (Cold)

15°-25° C

(59°-77° F)

Intake: 0.10-0.20 mm (0.0039-0.0078 in.)

Exhaust: 0.20-0.30 mm (0.0078-0.0118 in.)

3-23

3

7. Remove the cable ties (noting their locations for

assembling purposes) securing the wiring har-

ness to the throttle-body fuel rail; then loosen

the intake flange clamps securing the throttle

bodies. Remove the throttle bodies and place

them on the tunnel.

„ NOTE: After removing the throttle bodies, it is
advisable to close off the intake ports of the cylin-
der head to avoid any foreign objects or compo-
nents from falling into the engine.

8. Remove the cap screws securing the camshaft

covers to the cylinder head; then remove the

covers. Remove both camshafts.

ZJ107A

„ NOTE: For assembling purposes, both cam-
shafts must be removed for this procedure.

9. Using a magnet or a needle-nose pliers, care-

fully remove the tappet (A) and account for the

shim (B) from the out-of-specification valves as

identified in step 6.

ZJ083B

ZJ051

10. To select the correct replacement shim for an

out-of-specification clearance, note the three-

digit number on the surface of the existing shim;

then refer to the appropriate Tappet Shim Selec-

tion Table (Exhaust or Intake) and use this pro-

cedure:

A. Find the Measured Tappet Clearance (from step

5) in the left-side vertical column of the table.

B. Find the Present Shim Size (three-digit-number)

at the top-side horizontal column of the table.

C. Match the clearance in the vertical column with

the present shim size to obtain the recommended

replacement shim.

! CAUTION

If for any reason additional tappets and shims are
removed, care must be taken that they are marked
as to which valve they were removed from or severe
engine damage may occur.

3-24

SNO2152

3-25

3

SNO2153

 

 

 

 

 

 

 

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