Valve Guide Insertion; Dimensions And Clearance Between Guides And Valves; Valve Seats And Housings; Valve Seat Lapping - Kohler KD 625/3 Workshop Manual

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EXHAUST
VALVE
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KD Workshop Manual_cod. ED0053029350_1° ed_ rev. 00

Valve guide insertion

Heat cylinder head up to 160 ÷ 180°C.
Thread guides considering the A e B distances from the head plane.
Note: If the guides are supplied with the housing for the lock ring C,

Dimensions and clearance between guides and valves

Ref.
A
B

Valve seats and housings

INTAKE
VALVE

Valve seat lapping

After cutting, lap valve seats with fine emery paste in oil suspension.
The sealing surface S should not exceed 2 mm.
Disassembly / Reassembly
Ref.
A
B
insert the ring, then drive the guides until the lock ring is stop-
ped without worrying about A and B.
Dimensions (mm) Clearance (mm)
8.025 ÷ 8.040
0.025 ÷ 0.055
7.985 ÷ 8.000
Ref.
A
B
A
B
Valve recess after grinding
Ref. Dimensions (mm)
D 0.75 ÷ 1.25
Dimensions (mm)
30.80 ÷ 31.20
24.80 ÷ 25.20
Limit value (mm)
1.15
Dimensions (mm)
40.000 ÷ 40.016
40.120 ÷ 40.140
34.000 ÷ 34.016
34.120 ÷ 34.140
Limit value (mm)
1.65
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