Service Manual

ENGINE TOP END 4-19
*If the piston ring/groove clearance is greater than the specified value,
replace the piston.
Piston Ring/Groove Clesrance
Top
Second
Servke Limit
0.15 mm (0.005 in)
0.12 mm (0.005 in)
NOTE
0 The oil ring is a three piece assembled ring.
Difficult to measure the
ring groove clearance and thickness, visually inspect only.
l Measure the piston ring thickness.
o Use a micrometer to measure at several points around the rings.
*If any of the measurement are less than the service limit, replaoe the
entire set of rings.
Piston Ring Thickness
Top
Secand
Service Llmit
1.12 mm (0.W in)
1.12 mm (0.044 in)
NOTE
0 When using new rings in a used piston, check for uneven groove
wear. The rings should fit perfectly parallel to the groove sides. If
not, replace the piston.
Piston Ring End Gap
0 Remove the piston rings.
@Push each ring (one at a time) in the cylinder bore 1.1
the bottom of the cylinder bore.
0 Use the piston to push it in to be sure it is square.
l Measure the gap between the ends of the ring (A)
ww @I.
*If the end gap of any Iring is greater than the service
entire set of rings.
Piston Ring End Gap
Sewvice Llmit
1.2 mm (0.05 In)
‘I .5 mm (0.05 in)
3 a point close to
with a thickness
limit, replace the
Top, Second
Oil