S5 Workshop Manual
Engine
EM-25
Inspect the matching condition of piston pin in piston hole. Replace the defected
piston and pin assembly. Piston pin must be pressed into pin hole stably with hands
(at indoor temperature).
2) Piston Ring
Measure the side clearance of piston ring. If the measured value exceeds repair
limit value, insert a new ring into the ring groove. Measure the side clearance. If the
clearance still exceeds repair limit value, replace piston together with ring. If the
clearance is smaller than repair limit value, only replace piston ring.
Standard Value
Piston ring side clearance
No.l: 0.04
～
0.75 mm
No.2: 0.02
～
0.06 mm
Oil ring: 0.06
～
0.15 mm
Measure the end play of piston ring. Put a piston ring into the cylinder hole. Press
piston slight to push the ring downwards until the ring perpendicular to the cylinder
wall. Use a clearance gauge to measure the clearance. If the clearance exceeds service
limit value, replace piston ring.
Piston ring end clearance
Standard dimension
No.l: 0.25
～
0.35 mm
No.2: 0.40
～
0.55 mm
Oil ring blade: 0.10
～
0.6 mm
Limiting value
No.l , No.2: 0.8 mm
Oil ring blade 1.0 mm
4. Installation
Notes:
■ When install connecting rod cover, make sure the cylinder number matches with the
mark made on connecting rod cover when dismantling it. When installing a new
connecting rod, make sure the cut openings clamped the bushing are on the same side.
EM031
EM030
Use piston to place piston ring
in good condition
End play
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