The clearance is computed by subtracting the piston
outside diameter from the cylinder liner inside
diameter. Replace either piston or cylinder liner,
whichever damaged more, if the clearance is beyond
the specified limit.
3) Piston rings
(1) Visual check
Replace the piston rings with new ones if detected
worn or broken when the engine is overhauled.
(2) Piston ring gap
Insert the piston ring into the upper portion of the
cylinder liner bore so that it is held at a right angle to
the cylinder liner wall.
Measure the piston ring gap with a feeler gauge.
Replace piston rings with new ones if the gap is
beyond the limit.
(3) Piston ring side clearance
Fit the compression ring and oil ring in the piston
ring groove.
With a feeler gauge, measure side clearance of
each ring, and replace either the ring or piston if the
measured value is beyond the specified limit.
SPC000006 5ton Diesel Engine
Page 60
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