3-52 ENGINE
& Piston ring groove width
Standard (1st) : 1.21 – 1.23 mm (0.0476 – 0.0484 in)
(2nd): 1.01 – 1.03 mm (0.0398 – 0.0406 in)
(Oil) : 2.01 – 2.03 mm (0.0791 – 0.0799 in)
& Piston ring thickness
Standard (1st) : 1.17 – 1.19 mm (0.0461 – 0.0469 in)
(2nd): 0.97 – 0.99 mm (0.0382 – 0.0390 in)
" 09900-20803: Thickness gauge
09900-20205: Micrometer (0 – 25 mm)
PISTON RING FREE END GAP AND PISTON RING END GAP
• Measure the piston ring free end gap using vernier calipers.
• Next, fit the piston ring squarely into the cylinder and measure
the piston ring end gap using the thickness gauge.
If any of the measurements exceed the service limit, replace the
piston ring with a new one.
& Piston ring free end gap
Service Limit (1st) : 7.6 mm (0.30 in)
(2nd): 8.8 mm (0.35 in)
" 09900-20102: Vernier calipers
& Piston ring end gap
Service Limit (1st) : 0.70 mm (0.028 in)
(2nd): 0.70 mm (0.028 in)
" 09900-20803: Thickness gauge
OVERSIZE PISTON RING
The following two types of oversize piston rings are used.
They bear the following identification numbers.
SIZE 1st 2nd
STD NIL NIL
0.5 mm O.S. 50 50
0.5 mm
O.S.
PartShark.com
877-999-5686
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