Examination
Chapter XI. Cylinder block
89
8. Piston check
6. Remove the pistons, number them according to the number
(b) Measure the piston diameter at a height of 12 mm from the bottom edge
(a) If there are cracks, scratches or depressions on the surface (especially
the contact), the piston must be replaced.
cylinder and put separately.
skirts.
ÿ Nominal value: 0.041-0.069mm
ÿ Tool: micrometer
7. Piston pin check
ÿ Base value: 82.441-82.459mm
(a) Insert the piston pin into the fitting hole of the upper end of the connecting
rod. There should be some slight resistance. In the presence of a large
gap or with free entry into the hole, the piston pin
to be replaced.
9. Checking clearance between piston and cylinder wall
(b) Piston pin (A) must rotate freely relative to piston (C).
(1) Define 3 planes (C-plane depth 10mm from the top edge of the cylinder
block, D-plane 50mm, E-plane 90mm) over the entire height of the
cylinder. Define 2 perpendicular axes (A and B) to measure the inside
diameter of the cylinder in each plane.
(2) Calculate the clearance between the piston and the cylinder
wall based on the outer diameter of the piston and the
minimum inner diameter of the cylinder:
12 mm
Machine Translated by Google
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