Checking The Oil Pump; Camshaft - Kohler KD 500 Workshop Manual

Rotor A
24
25
Intake
Exhaust
26
27
Workshop Manual KD500 _ cod. ED0053029390 - 1° ed_rev. 00
Rotor B
Injection

Checking the oil pump

Make sure that the oil pump cover is in a good condition.
After demounting, examine the rotors and replace them if their
lobes or centerings are damaged. To check the degree of pump
wear, measure the dimensions of rotor A and rotor B (fig. 24)
and compare them with the values in the following table:
OIL PUMP ROTOR DIMENSIONS AND PLAY
Measurement Dimensions mm
C Ø 25,97 ÷ 25,99
D Ø 34,96 ÷ 34,99
E 26,205 ÷ 26,27
F
The entire pump must be replaced if the wear is greater.
The coupling play between the external oil pump rotor and the
housing on the cover of the timing system is:
Fitting mm
0,16 ÷ 0,215
Make sure that the oil pump recess in relation to the surface of
the timing system cover (fig. 25) is between :
Fitting mm
0,03 ÷ 0,07
Make sure that there are no impurities in the by-pass valve
on the cover on the timing system side by unscrewing the
inspection plug near the fuel flow limiter.

Camshaft

Make sure that the cams and bearing pins are not scored or
worn.
Check the dimensions as indicated in fig. 26.
Check the dimensions of the camshaft pins (D, fig. 27) and
thecorresponding housings in the casing and cover on the timing
system side. The max. xonstructional play is 0.032 to 0.061 mm.
WARNING: replace the shaft if the wear on the cams or
pins exceeds:
0.1 mm (injection cams and pins)
0.3 mm (intake and exhaust cams).
Checks and overhaul
Max. wear mm
Ø 25,92
Ø 34,87
26,31
7,97 ÷ 7,99 7,93
Max. wear mm
0,345
Max. wear mm
0,11
10
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