Tomei Powered PISTON KIT - Manual (Page 16)

2. DEBURRING CASTING ERRORS & RADIUS FINISH
Chamfer and radius the edges and galleries to remove all casting flashes/errors. You can also use #400 grit
sandpaper for certain areas like the bottom of the piston skirts and on sharp edges.
Clearance R 0.3
3. PISTON RING ADJUSTMENTS & PREPARATIONS
① Insert the Piston Ring & position it in the middle of the
cylinder bore by using the head of the Piston, or a ring
squaring tool. Then check the ring gap clearances with
a thickness gauge.
② If the Ring Gap is too narrow and not within the
required clearance values, you'll have to file the edges
of the Piston Rings to enlarge the gap, until the gap is
within the required specifications.
Clearance (mm)
Top Ring 0.18～0.35
Second Ring 0.18～0.35
Oil Ring 0.15～0.70
CAUTION
Adjust the Ring Gap to meet the specified clearance. If the Ring Gap Clearance is not
within the specified ring gap clearance values, can cause possible damages & engine failure.
Approx
110mm
Thickness Gauge
16