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Workshop Manual KD 441_cod. 1.5302.865_2
nd
ed_ rev. 01.
mm 3.00 ÷ 3.50
66
69
68
86.000÷86.015 85.905÷85.920 0.08÷0.11
67
5
Injector protusion
The end of nozzle A should protrude from the cylinder head plane :
Adjust with copper gaskets B with thickness of 0.5, 1 and 1.5 mm
Caution – Warning
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 0.35 ÷ 0.60 µm.
The cylinder surface which comes into contact with piston rings
should be machined with the plateau method.
Piston
Remove circlips and piston pin.
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).
Note: Oversize pistons of 0.50 and 1.00 mm are available.
Piston and cylinder dimensions (mm)
Ø Cilinder Ø Piston Wear limit
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°.
Ifwearexceedsthemax.givenvalueby0.05,borethecylinderandt
oversize piston and rings.
Seetable"Pistonandcylinderdimensions" for cylinder diameter values.
Important
Protect the contact surfaces with lubricating oil, to prevent them
from rusting.
Overhauls and checking
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