Cylinder; Cylinder Roughness; Piston; Dimensions Of Pistons And Cylinders, Logo - Kohler KD225 Workshop Manual

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KD 225_315_350_400_440 Workshop Manual_cod. ED0053029330_1° ed_ rev. 00
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Cylinder

Set a bore gauge to zero with a calibrated ring.
Check diameter at 1, 2 and 3; repeat the operation at the same points
after turning the bore gauge 90°.
If wear exceeds the max. given value by 0.05, bore the cylinder and fit
oversize piston and rings.
See fig. 40 and 41 for cylinder diameter values.
Do not manually hone the cylinder bore surfaces with emery
cloth or other means.

Cylinder roughness

The cross-hatch pattern should be at an angle of 45°-55°; lines should
be uniform and clear in both directions.
Average roughness must range between 0.5 mm 1 µm.
The cylinder surface which comes into contact with piston rings should
be machined with the plateau method.

Piston

Being of low expansion type, the piston allows small clearances
between piston and cylinder and, thus, oil consumption is reduced.
Remove circlips and piston pin.
Remove piston rings and clean grooves.
Measure diameter Q at the A distance from the skirt bottom (A = 12
mm).
Replace the piston and piston rings if wear on the diameter is 0.05
mm more than the minimum value given (see table in fig. 40-41).
Note: Oversize pistons of 0.50 and 1.00 mm are available.

Dimensions of pistons and cylinders, Logo

Logo can be found inside the piston
Ø Cilinders
225 6 9 0 . 0
315
7 8 0 . 0
350 - 350EPA 8 2 0 . 0
400 8 2 0 , 0
400EPA 8 2 0 , 0
440 - 440EPA 8 6 0 , 0
DISASSEMBLY/REASSEMBLY
Ø Piston
÷ 6 9 0 , 1 5 6 8 9 , 5 5 ÷ 6 8 9 , 7 0
÷ 7 8 1 . 5 7 7 9 . 5 5 ÷ 7 7 9 . 7 0
÷ 8 2 0 . 1 5 8 1 9 . 5 5 ÷ 8 1 9 . 7 0
÷ 8 2 0 , 1 5 8 1 9 , 5 5 ÷ 8 1 9 , 7 0
÷ 8 2 0 , 1 5 8 1 9 , 2 5 ÷ 8 1 9 , 4 0
÷ 8 6 0 , 1 5 8 5 9 , 5 5 ÷ 8 5 9 , 7 0
8
Clearance
0 0 . 3 ÷ 0 0 . 6
0 0 . 3 ÷ 0 0 . 6
0 0 . 3 ÷ 0 0 . 6
0 0 . 3 ÷ 0 0 . 6
0 0 . 6 ÷ 0 0 . 9
0 0 . 3 ÷ 0 0 . 6
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