Service Manual

CYLINDER HEAD AND VALVES

3. Using bushing driver, Tool #19416, press in new

valve guide bushing until tool bottoms on cylinder

head, Fig. 19.

Fig. 19 – Installing Valve Guide Bushing

VALVES AND SEATS

1. Valve faces may be resurfaced to 45°. See Fig. 20

for dimensions for valves. Lap valves and seats

with valve lapping Tool, #19258 and valve lapping

compound, Tool #94150.

Fig. 20 – Valve Dimensions

SEATING AREA CENTERED

ON VALVE FACE

(1/16” TO 3/64”)

(.040”)

MINIMUM

0.8 mm TO 1.2 mm

1.0 mm

2. Valve seats may be reconditioned using valve seat

cutter, Tool #19446.

NOTE: Check valve guide bushings first. If valve

guides are worn, they must be replaced

before refacing valve seats

If valve seat is wider than dimension shown in Fig. 21,

a narrowing cutter should be used to ensure that

contact area of valve seat is centered on face of valve,

Fig. 20.

a. Use a 60° cutter to narrow seat from bottom

and a 30° cutter to narrow seat from top,

Fig. 21.

NOTE: If valve seat is loose or cracked, replace

cylinder head.

Fig. 21 – Valve Seat Dimensions

45°

VALVE SEAT DIMENSIONS

60° CUTTER

30° CUTTER

(1/16” TO 3/64”)

0.8 mm TO 1.2 mm

3. Measure valve stem diameter at specified

distance from end of valve, as shown in Fig. 22.

Replace IN if less than 5.927 mm (0.2333 in.).

Replace EX if less than 5.923 mm (0.2332 in.).

Fig. 22 – Measure Valve Stem Diameter

35 mm

(1.38”)