Conrod And Crankshaft - Suzuki AN400 Service Manual

3-40 ENGINE
PISTON RING FREE END GAP INSPECTION
• Before installing piston rings, measure the free end gap of
each ring using vernier calipers. If the gap is less than the ser-
vice limit, replace the ring.
' Piston ring free end gap: Service Limit:(1st) 9.0 mm
% 09900-20102: Vernier calipers
PISTON RING-TO-GROOVE CLEARANCE INSPECTION
• Remove carbon deposit both from the piston ring and its
groove.
• Fit the piston ring into the groove. With the ring compressed
and lifted up, measure the clearance on the bottom side of the
ring using a thickness gauge.
' Piston ring-to-Groove clearance:
Service Limit: (1st) 0.18 mm (0.007 in)
(2nd) 0.15 mm (0.006 in)
' Piston ring groove width:
Standard: (1st) 1.01 – 1.04 mm (0.0398 – 0.0409 in)
(2nd) 1.01 – 1.04 mm (0.0398 – 0.0409 in)
(Oil) 2.01 – 2.03 mm (0.0791 – 0.0799 in)
' Piston ring thickness:
Standard: (1st) 0.97 – 0.99 mm (0.0382 – 0.0390 in)
(2nd) 0.97 – 0.99 mm (0.0382 – 0.0390 in)
% 09900-20803: Thickness gauge
09900-20205: Micrometer (0 – 25 mm)

CONROD AND CRANKSHAFT

CONROD SMALL END INSIDE DIAMETER INSPECTION
• Using a dial calipers, measure the conrod small end inside
diameter both in vertical and horizontal directions. If any of the
measurements exceeds the service limit, replace the conrod.
' Conrod small end I.D.: Service Limit: 20.040 mm
% 09900-20605: Dial calipers (1/100 mm, 10 – 34 mm)
(0.35 in)
(2nd) 6.2 mm
(0.24 in)
(0.7890 in)