Workshop Manual

4–6 ENGINE ASSEMBLY II

Note:

Use an adjustable valve cutter pilot.

Do not allow the cutter pilot to wobble inside the valve

guide.

3. Apply abrasive compound to the valve seat insert

surface.

4. Insert the valve into the valve guide.

5. Hand lap the valve and the valve seat with a lapping

cup.

This will provide optimum valve and valve seat con-

tact for effective gas sealing.

6. Check that the valve contact width is correct.

7. Check that the valve seat insert surface is in contact

with the entire circumference of the valve.

VALVE SPRING

Valve Spring Free Length

Use a vernier caliper to measure the valve spring free

length.

If the measured value is less than the specified limit, the

valve spring must be replaced.

mm (in)

Painted portion

Angle Location Standard

Intake Valve Seat Angle B 45°

Exhaust Valve Seat Angle B 45°

Color Standard Limit

Exhaust and Intake

60.6 58.0

Valve Spring Free blue

(2.39) (2.28)

Length