Workshop Manual

ENGINE ASSEMBLY II 4–5

3. Use a screwdriver 3 to pry the valve seat insert

free.

Take care not to damage the cylinder head 4.

4. Carefully remove carbon and other foreign material

from the cylinder head insert bore.

Valve Seat Installation

1. Carefully place the attachment 1 (having the

smaller outside diameter than the valve seat insert)

on the valve seat insert 2.

Note:

The smooth side of the attachment must contact the

valve seat insert.

2. Use a bench press 3 to slowly apply pressure to the

attachment and press the valve seat insert into

place. (Amount of pressure needed is more than 25

kN (2,500 kgf/5,512 lb)

Note:

Do not apply an excessive amount of pressure with the

bench press. Damage to the valve seat insert will result.

Valve Seat Insert Correction

1. Remove the carbon deposits from the valve seat

insert surface.

2. Use valve cutters (15°, 30°, or 75° blades) to remove

scratches and other rough areas.

This will bring the contact width back to the stan-

dard value of 90° A.

Remove only the scratches and rough areas. Do not

cut away too much. Take care not to cut away

unblemished areas of the valve seat surfaces.

30˚

150˚