Westerbeke 6.5KW - Page 47

Checking Piston
1. Check pistons carefully and replace, if severe burns or scratches
on the external circumference of the piston are found.
2. Measure the piston diameter 18 mm (0.7087 in) under the oil ring
groove, at right angles with the piston pin location (but without
the pin in place).
Standard piston diameter:
6.5 & 8 KW: 69.944 - 69.964 mm
(2.7537 - 2.7545 in)
11 KW: 76.954 - 76.974 mm
(3.0297 - 3.0305 in)
3. Check the clearance between the piston and cylinder wall.
Clearance limit: 0.15 mm (0.0059 in)
18 mm
(0.7087 111)
Checking Piston Rings
1. Check the piston rings for
cracks, burning or wear and
replace, if necessary.
2. Measure the piston ring end gap.
Replace if it exceeds the limit.
NOTE: Push a ring into the
cylinder with a piston until it
is about 2 inches from the block
surface.
End gap limit: 1.0 mm
(0.039 in)
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