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4-22 ENGINE TOP END
Piston Wear
.Measure the piston outside diameter 5 mm up from the
bottom of the piston at a right angle to the direction of
the piston pin.
Piston Ring End Gap
.Place the piston ring inside the cylinder, using the
piston to locate the ring squarely in place. Set it close
to the bottom of the cylinder, where cylinder wear is
low.
.Measure the gap between the ends of the ring with a
thickness gauge.
Piston Outside Diameter
Standard: 56.942 -56.957 mm
Service Limit: 56.79 mm
Piston Diameter Measurement
Piston Ring End Gap
Standard
Top 0.20 -0.40 mm
Second 0.35 -0.50 mm
Service limit
O.7mm
O.8mm
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1. Piston Outside Diameter
2. 5mm up from bottom
--@
Piston Ring, Piston Ring Groove Wear
.Check for uneven groove wear by inspecting the ring
seats.
*The rings should fit perfectly parallel to the groove
surfaces. If not, the piston must be replaced.
.With the piston rings in their grooves, make several
measurements with a thickness gauge to determine
piston ring/groove clearance.
1. Gap
2. Piston Ring
Piston Ring/Groove Clearance
Standard: 0.03 -0.07 mm
Service Limit: 0.17 mm
1. Thickness Gauge