Reference
Modification no.
- 0 -
Page
250
Date
1997 02 01
Main
914 F
01480
Maß
dim.
14.5.5) Valve springs
See Pic. 250 and 251.
2 springs per valve are fitted. The inner spring Q is of 2,3 mm thick wire, the
outer spring W is of 3,5 mm thick wire. The same springs are on inlet and
exhaust valves. Spring rate non-progressive. Visually check springs for
fracture and deformation.
Check free length of both springs, see dimension A in Chapter 15). Renew
valves shorter than the minimum length.
â—† NOTE: Actual spring length ought to be as equal as possible on
inlet- and outlet side. If need be, renew.
Dimensions new wear limit
See Wear Limits, Chapter 15).
14.5.6) Rocker arms
See Pic. 252 and 253.
The rocker arm bearing surface Q is lubricated via the hollow push rod W to
the ball cup E. The oil flows through the bores R in the rocker arm. The oil
exit and in consequence the splash oil lubrication of the complete valve
mechanism is via bore T. The rocker arms for inlet and outlet
are different.
Check surface of rocker arm shaft and bearing bush Y for
wear. Visually check valve stem contact area U and ball
cup E of rocker arm. Excessive signs of wear indicate
lack of oil. Slight rework of contact area U on rocker arm
is allowed. Check oil bore R for free passage.
The bearing bush Y can be renewed. Knock out old
bearing bush with a suitable punch, clean both oil ducts R and
check for free passage with compressed air. Press in new bush
so that the oil ducts in rocker arm and bearing bush align. After
fitting of bearing bush, ream to dimension S, see Chapter 15).
Deburr bores and clean oil ducts with compressed air.
Dimension new wear limit
See Wear Limits, Chapter 15).
Pic. 251
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Maß
dim.
1
2
1
5
3
6
Pic. 252
7
2
4
Pic. 253
6
Pic. 250
00283
00282
00286
00287
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