EM/Engine Mechanical, page 55

EG–55
ENGINE – ENGINE MECHANICAL

Overall Length

EM0534

EM0255

(d) Check the valve overall length.
Standard overall length:
    Intake
        98.29–98.79 mm (3.8697–3.8894 in.)
    Exhaust
        98.84–99.34 mm (3.8913–3.9110 in.)
Minimum overall length:
    Intake
        98.19 mm (3.8657 in.)
    Exhaust
        98.74 mm (3.8874 in.)
If the overall length is less than minimum, replace the valve.
(e) Check the surface of the valve stem tip for wear.
If the valve stem tip is worn, resurface the tip with a grinder
or replace the valve.
NOTICE: Do not grind off more than the minimum overall
length.

8. INSPECT AND CLEAN VALVE SEATS
45° Carbide Cutter
P02127

(a) Using a 45° carbide cutter, resurface the valve seats.
Remove only enough metal to clean the seats.

Width
EM01B3 EM0635
Z00375

(b) Check the valve seating position.
Apply a thin coat of prussian blue (or white lead) to the valve
face. Lightly press the valve against the seat. Do not rotate
the valve.
(c) Check the valve face and seat for the following:
• If blue appears 360° around the face, the valve is
concentric. If not, replace the valve.
• If blue appears 360° around the valve seat, the guide
and face are concentric. If not, resurface the seat.
• Check that the seat contact is in the middle of the valve
face with the following width:
Intake
    1.0–1.4 mm (0.039–0.055 in.)
Exhaust
    1.2–1.6 mm (0.047–0.063 in.)
If not, correct the valve seats as follows:
• If the seating is too high on the valve face, use 15° and
45° cutters to correct the seat.

45°
15°
Width
P03966