Kohler KDI 1903M Workshop Manual page 103

INFORMATION ABOUT OVERHAULING
Measure value A, C, D, E and F and confront them with
those described in Tab.8.6.
If the measured values do not follow those described in
Tab.8.6, replace connecting rod T.
8.5.2 Checking the gudgeon pin-pin axes are parallel
Lubricate gudgeon pin A and bearing R (Fig. 8.12).
Insert the gudgeon pin into bearing R. Use a dial gauge to
check the axis parallelism of the connecting rod big end
and small end.
Parallel deviation (value V) measured at the tip of the
gudgeonpin, must be a MIN of 0,015 and MAX of 0,030
mm.
If the parallelism values do not comply with the specified
ones,replace the connecting rod with a new one.
8.5.3 Piston rings check
Insert ring U into the cylinder, measure value H (distance
between the points of ring U).
Repeat for all the seal rings.
If the measured value H does not correspond to the values
indicated in the table (Tab. 8.7), replace the seal rings U.
Important
•
Seal rings cannot be replaced separately.
NOTE: refer to Fig. 8.19 to locate the rings.
Tab. 8.7
RINGS
U1
U2
U3
8.5.4 Piston dimension check
Clean the piston thoroughly.
Measure the diameter of the piston at 12 mm (quota L) from
the base of the skirt in correspondence with the graphite
lubrication windows M.
Refer to Tab. 8.1b to establish the clearance value of the
pistons with a decreased diameter.
In correspondence with point W, there are:
3 digits for the STD piston;
3 digits followed by R for a piston with an increased
diameter of 0.10 mm;
H (mm)
0.100 - 0.300
0.250 - 0.500
0.250 - 0.400
Fig 8.14
Fig 8.15
Fig 8.16
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