Wsm 05-E2B SERIES Especificaciones descargar pdf (Pagina 118)

ENGINE

SM-E4B SERIES, WSM

1-S54

Correcting Valve and Valve Seat

NOTE

• Before correcting the valve and seat, check the valve stem

and the I.D. of valve guide section, and repair them if

necessary.

• After correcting the valve seat, be sure to check the valve

recessing.

1) Correcting Valve

1. Correct the valve with a valve refacer.

2) Correcting Valve Seat

1. Slightly correct the seat surface with a 0.79 rad (45 °) valve seat

cutter.

2. Fitting the valve, check the contact position of the valve face

and seat surface with prussian blue. (Visual check) [If the valve

has been used for a long period, the seat tends to come in

contact with the upper side of the valve face.]

3. Grind the upper surface of the seat with a 0.26 rad (15 °) valve

seat cutter until the valve seat touches to the center of the valve

face (so that (1) equals (2) as shown in the figure).

4. Grind the seat with a 0.79 rad (45 °) valve seat cutter again, and

visually recheck the contact between the valve and seat.

5. Repeat steps 3 and 4 until the correct contact is achieved.

6. Continue lapping until the seated rate becomes more than 70 %

of the total contact area.

9Y1210785ENS0068US0

Valve Lapping

1. Apply compound evenly to the valve lapping surface.

2. Insert the valve into the valve guide. Lap the valve onto its seat

with a valve flapper or screwdriver.

3. After lapping the valve, wash the compound away and apply oil,

then repeat valve lapping with oil.

4. Apply prussian blue to the contact surface to check the seated

rate. If it is less than 70 %, repeat valve lapping again.

IMPORTANT

• When valve lapping is performed, be sure to check the

valve recessing and adjust the valve clearance after

assembling the valve.

9Y1210785ENS0069US0

Valve face angle Factory specification

0.79 rad

45 °

Valve seat angle Factory specification

0.79 rad

45 °

(1) Valve Seat Width

(2) Identical Dimensions

(A) Check Contact

(B) Correct Seat Width

(D) Check Contact

(a) 0.26 rad (15 °)

(b) 0.79 rad (45 °)

KiSC issued 01, 2013 A

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Wsm 05-E2B SERIES Especificaciones Pagina 118

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