ARIA

ENGINE

C. VALVE GUIDES:

1. In case of valve stem sticking in valve guide bore

or Excessive clearance between them, remove

valve guide From cylinder head using drift

(Part

No.2868 5890 06 05).

2. Check the condition of valve guide oil seals.

3. Check valve guide bore diameter in cylinder

head and if necessary, ream valve guide bore in

cylinder head to next over size.

4. Install matching size valve guide in cylinder head

using drift

(Part No. 2868 5890 06 05)

and spac-

(Part No. 2653 5890 06 01).

5. Fit Valve guide oil seals

D. VALVE SEAT:

1. Check valve seat height with respect to cylinder

head mating surface. Replace valve seat inserts

if they are worn out beyond specified limit.

2. Cut exhaust and inlet valve seats with a general

45 deg. cutter.

NOTE

Valve seat must be absolutely faultless and without

any chatter marks

3. If necessary lap the valve seats to a smooth and

even finish by using suitable hand pump grinder

or a lapping paste and valve itself.

4. Smear valve seat with carbon blue. Install valve

in guide and turn it slowly under axial pressure.

5. Contact line on valve seat must be around entire

circumference at equal width.

6. Distance between narrow diameters of valve

face to contact line should be minimum 0.5 mm.