Kohler KDI 1903M Workshop Manual page 107

INFORMATION ABOUT OVERHAULING
8.6.5 Valve guides replacement
The intake and exhaust guides are both made out of grey iron
with pearlitic phosphoric matrix and they have the same
dimensions.
The guides are press-fit assembled; assembly is possible by
cooling the guides with the aid of liquid nitrogen.
Before assembling a new guide, measure value L and
M,calculate the press-fit value, which must observe the
values in Tab. 8.11.
Observe values G from surface F when assembling guides H
(Tab. 8.10 - Fig. 8.23).
Important
•
The guides must be worked for value E (Tab. 8.10 -
Fig.8.23) after driving. Contact a rectification
workshop for such operations.
Tab 8.11 valve guides - housing dimensions
REF. DIMENSIONS (mm)
L 10.000 - 10.015
M 10.045 - 10.054
8.6.6 Rocker arm check
Measure values W1 in correspondence with holes M located
on rocker arm gudgeon L (seen from B in Fig. 8.25).
Measure values W2 (Fig. 8.27).
Based on the values measured, calculate the clearance
between W1 and W2, which is to observe the values in Tab.
8.12.
Check that all oil pipes N and M are free from impurities or
obstructions.
Tab 8. 12
DIMENSIONS (mm)
REF.
W1 19.985 - 20.005
W2 20.040 - 20.061
PRESS-FIT VALUE (mm)
0.030 - 0.054
CLEARANCE VALUE (mm)
0.035 - 0.076
Fig 8.24
Fig 8.25
Fig 8.27
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