VALVE SEATS AND VALVES
ROCKER ARM MECHANISM
33.
Dismantle the rocker arm mechanism and clean
the parts. Check the shaft and the bushes for
wear. If the bushes need to be replaced, the tool
A = max 2.5 mm (0.10")
C = 45°
B = 1±0.1 mm (0.040±0.004") D = 44,5°
884560
is used for pressing out and in. (Ensure
that the oil hole in the bush coincides with that
in the rocker arm). After having been pressed in,
the bushes should be reamed to give an accu-
rate running fit. Check whether the rocker arm
surface which bears on the valve is worn. Minor
adjustments can be made with the valve grind-
ing machine. Oil the shaft and fit the parts.
NOTE! Fit the wear caps on the valve stems.
31.
Mill or ream the valve seats, the angle (C)
should be 45°. Check the valve guides and re-
place them if necessary before machining the
seats, see point 29. The width (B) of the sealing
surface should be 1±0.1 mm (0.040"±0.004").
Grind the valves in the valve grinding machine.
The angle (D) should be 44.5°. If the thickness
of the edge of the disc after grinding is less than
1.5
mm (0.059"), the valve should be rejected.
Discard also valves with bent stems or if the di-
mension (A) exceeds 2.5 mm (0.10"). If neces-
sary grind the surface on which the rocker arm
bears. Grind the valves in using grinding com-
pound and check the surface contact using
marking blue.
VALVE SPRINGS
VALVE TAPPETS
32.
Check the valve spring lengths both loaded and
unloaded.
Length unloaded ...................................... 50 mm (1.969")
Length when loaded with
34.
Check the valve tappets for wear. The cylindri-
L
L1
cal surface should not be scored or porous. The
surface bearing on the camshaft should not be
rough or worn unevenly. Replace the tappets if
necessary.
300±20
N (30±2 kp = 66.6±4.41 lbf) ....... 39 mm (1.535")
Length when loaded with
N (56±3 kp = 123.5±6.6 lbf) ......... 32 mm (1.26")
L2
560±30
16
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD11C, Volvo Penta MD11D, Volvo Penta MD17C, Volvo Penta MD17D |
| Download File |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
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