SAFARI

ENGINE

Fig. 6

0.5 mm

Fig. 4

Fig. 5

c. Check valve seat height with respect to cylinder

head parting surface. Replace valve seat inserts if

they are worn out beyond specified limit.

1 Place cylinder head on suitable wooden support.

2 Measure valve seat diameter.

3 Use 15 deg cutter for cutting exhaust valve seat

inserts as shown in Fig. 4.

4 Cut valve seats with a 45 deg cutter both for the

intake and exhaust inserts. Fig. 5.

NOTE

Seat must be absolutely faultless and without any

chatter mark.

5 If necessary, lap valve seats to a smooth and even

finish by using lapping paste.

6 Smear valve seat with carbon blue, place valve in

guide and turn it slowly under axial pressure. The

contact line on valve seat must be around the

entire circumference at equal width. The distance

between narrow diameter of valve seat to contact

line should be within specified limit. Fig. 6.

7 Check for leakage past valve and its seat by

pouring gasoline on valve head. The gasoline must

not seep past the seat.

8 Measure distance between valve head and

cylinder head parting surface. Refinish valve seats

if required.