Valve Seats And Housings; Valve Seat Grinding; Pushrod Tube; Cylinder - Kohler KD 625/2 Workshop Manual

4
Disassembly / Reassembly
EXHAUST
VALVE
40
41
43
125° ÷ 135°
44
- 36 -

Valve seats and housings

INTAKE
VALVE
Press valve seats into the housings and cut at 45°.

Valve seat grinding

After cutting grind valve seats with fine emery paste in oil suspension.
The sealing surface S should not exceed 2 mm.
Valve recess after grinding D = 0.75÷1.25 mm; maximum worn limit
1.65 mm.
42

Pushrod tube

When refitting cheek that gaskets A and rocker arm lubricatíon tube C
are well inside their seats.

CYLINDER

Checks and cylinder roughness

Fins must be intact.
Cross hatch pattern must range between 125°÷135°: they must be
uniform and clear in both directions.
Average roughness should range between 0.35 and 0.60 µm.
Ref.
A
B
C
D
KD 625-2 Workshop Manual_cod. ED0053029380_1° ed_ rev. 00
Dimensions (mm)
4 0 0 . 0 0 ÷ 4 0 0 . 1 6
4 0 0 . 8 1 ÷ 4 0 0 . 9 5
3 4 0 . 0 0 ÷ 3 4 0 . 1 6
3 4 0 . 8 1 ÷ 3 4 0 . 9 5