DR ALL-TERRAIN Wartungshandbuch PDF herunterladen (Seite 218)

100

101

5-36 ENGINE TOP END

Valves

If the seat width is too wide, make the 60° [A] grind de-

scribed below.

If the seat width is within the specified range, lap the valve

to the seat as described below.

•

Grind the seat at a 60° angle until the seat width is within

the specified range.

○

To make the 60° grind, fit 60° cutter into the holder, and

slide it into the valve guide.

○

Turn the holder, while pressing down lightly.

○

After making the 60° grind, return to the seat width mea-

surement step above.

Correct Width [B]

•

Lap the v alve to the seat, once the seat width and O.D.

are within the ranges specified above.

○

Put a little coarse grinding compound on the face of the

valve in a number of places around the valve head.

○

Spin the valve against the seat until the grinding com-

pound produces a smooth, matched surface on both the

seat and the valve.

○

Repeat the process with a fine grinding compound.

[A] Lapper

[B] Valve Seat

[C] Valve

•

The seating area should be marked about in the middle

of the valve face.

If the seat area is not in the right place on the valve, check

to be sure the valve is the correct part. If it is, it may have

been refaced too much; replace it.

•

Be sure to remove all grinding compound before assem-

bly.

•

When the engine is assembled, be sure to adjust the valve

clearance (see Valve Clearance Adjustment in the Peri-

odic Maintenance chapter).

1 2 ... 213 214 215 216 217 218 219 220 221 222 223 ... 593 594

Kommentare zu diesen Handbüchern

Keine Kommentare

DR ALL-TERRAIN Wartungshandbuch Seite 218

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Rasenmäher DR ALL-TERRAIN