Illustration 1 | g00845975 |
(1) The chamber that is on the top of the piston must face the right side of the engine.
(2) The Shibaura name that is on the inside of the piston must align with the stamped number on the connecting rod.
Illustration 2 | g00845969 |
Use a feeler gauge to measure the clearance between the piston ring groove and the piston ring. If the clearance is greater than the service limit, use a new piston ring and check the clearance.
If the clearance is within the service limit, renew the piston rings. If the clearance is outside of the service limit, renew the piston.
(1) Top piston ring
- Naturally aspirated ... Barrel face
Shape of top ring (A)
- Turbocharged ... Keystone
- Clearance between piston ring groove and top piston ring ...
0.06 to 0.10 mm (0.0024 to 0.0039 inch)
C0.5 and C0.7
- Service limit for clearance of top piston ring ...
0.25 mm (0.0098 inch)
- Gap of top piston ring ...
0.13 to 0.25 mm (0.0051 to 0.0098 inch)
- Service limit for gap of top piston ring ...
1.0 mm (0.039 inch)
- Clearance between piston ring groove and top piston ring ...
0.06 to 0.10 mm (0.0024 to 0.0039 inch)
C1.1/3011C and C1.6
- Service limit for clearance of top piston ring ...
0.25 mm (0.0098 inch)
- Gap of top piston ring ...
0.15 to 0.27 mm (0.0059 to 0.0106 inch)
- Service limit for gap of top piston ring ...
1.0 mm (0.039 inch)
- Clearance between piston ring groove and top piston ring ...
0.07 to 0.11 mm (0.0028 to 0.0043 inch)
C1.5/3013C and C2.2/3024C
- Service limit for clearance of top piston ring ...
0.25 mm (0.0098 inch)
- Gap of top piston ring ...
0.20 to 0.35 mm (0.0079 to 0.0138 inch)
- Service limit for gap of top piston ring ...
1.0 mm (0.039 inch)
Note: It is difficult to measure the wear of the top piston ring on the C2.2/3024CT engine. When either the intermediate ring or the oil control ring is outside the service limit, renew all of the rings.
Note: Install the word "Top" toward the top of the piston. New top piston rings have a red identification mark which must be on the left of the ring gap when the top piston ring is installed on an upright piston.
Note: New top piston rings for the C2.2/3024CT have a yellow identification mark which must be on the left of the ring gap when the top piston ring is installed on an upright piston.
Note: The top surface of the piston ring should be equally distant from the top face of the cylinder block at all points before the piston ring end gap is measured with a feeler gauge.
(2) Intermediate ring
- Shape of intermediate ring (B) ... Taper
- Clearance between piston ring groove and intermediate ring ...
0.05 to 0.09 mm (0.0020 to 0.0035 inch)
C0.5 and C0.7
- Service limit for clearance of intermediate ring ...
0.25 mm (0.0098 inch)
- Gap of intermediate ring ...
0.10 to 0.22 mm (0.0039 to 0.0087 inch)
- Service limit for gap of intermediate ring ...
1.0 mm (0.039 inch)
- Clearance between piston ring groove and intermediate ring ...
0.05 to 0.09 mm (0.0020 to 0.0035 inch)
C1.1/3011C and C1.6
- Service limit for clearance of intermediate ring ...
0.25 mm (0.0098 inch)
- Gap of intermediate ring ...
0.12 to 0.24 mm (0.0047 to 0.0094 inch)
- Service limit for gap of intermediate ring ...
1.0 mm (0.039 inch)
- Clearance between piston ring groove and intermediate ring ...
0.04 to 0.08 mm (0.0016 to 0.0032 inch)
C1.5/3013C, C2.2/3024C and C2.2/3024CT
- Service limit for clearance of intermediate ring ...
0.25 mm (0.0098 inch)
- Gap of intermediate ring ...
0.20 to 0.40 mm (0.0079 to 0.0158 inch)
- Service limit for gap of intermediate ring ...
1.0 mm (0.039 inch)
Note: Install the word "Top" toward the top of the piston. New intermediate rings have a green identification mark which must be on the left of the ring gap when the intermediate ring is installed on an upright piston.
Note: The top surface of the piston ring should be equally distant from the top face of the cylinder block at all points before the piston ring end gap is measured with a feeler gauge.
(3) Oil control ring
- Clearance between piston ring groove and oil control ring ...
0.02 to 0.06 mm (0.0008 to 0.0024 inch)
C0.5 and C0.7
- Service limit for clearance of oil control ring ...
0.15 mm (0.0059 inch)
- Gap of oil control ring ...
0.10 to 0.30 mm (0.0039 to 0.0118 inch)
- Service limit for gap of oil control ring ...
1.0 mm (0.039 inch)
- Clearance between piston ring groove and oil control ring ...
0.02 to 0.06 mm (0.0008 to 0.0024 inch)
C1.1/3011C and C1.6
- Service limit for clearance of oil control ring ...
0.15 mm (0.0059 inch)
- Gap of oil control ring ...
0.20 to 0.35 mm (0.0079 to 0.0138 inch)
- Service limit for gap of oil control ring ...
1.0 mm (0.039 inch)
- Clearance between piston ring groove and oil control ring ...
0.02 to 0.06 mm (0.0008 to 0.0024 inch)
C1.5/3013C, 3024C/C2.2 NA and Turbocharged
- Service limit for clearance of oil control ring ...
0.15 mm (0.0059 inch)
- Gap of oil control ring ...
0.20 to 0.40 mm (0.0079 to 0.0158 inch)
- Service limit for gap of oil control ring ...
1.0 mm (0.039 inch)
The oil control ring has two components. The two components of the oil control ring are installed in the following order.
- Spring (D)
- Oil control ring (C)
Note: A latch pin is used in order to hold both ends of the spring of the oil control ring in position. The ends of the spring of the oil control ring must be 180 degrees opposite the end gap of the oil control ring.
Note: The top surface of the piston ring should be equally distant from the top face of the cylinder block at all points before the piston ring end gap is measured with a feeler gauge.
(4) Piston
- Diameter of the piston skirt ...
66.9375 to 66.9525 mm (2.6353 to 2.6359 inch)
C0.5 and C0.7
- Service limit ...
66.7 mm (2.6260 inch)
- Clearance of the piston skirt to the cylinder wall ...
0.048 to 0.082 mm (0.0019 to 0.0032 inch)
- Service limit ...
0.25 mm (0.010 inch)
- Diameter of the piston pin ...
18.998 to 19.002 mm (0.7480 to 0.7481 inch)
- Service limit ...
18.98 mm (0.7472 inch)
- Clearance between the hole for the piston pin and the piston pin ...
−0.004 to +0.004 mm (−0.00016 to +0.00016 inch)
- Service limit ...
0.02 mm (0.0008 inch)
- Diameter of the piston skirt ...
76.932 to 76.947 mm (3.0288 to 3.0294 inch)
C1.1/3011C and C1.6
- Service limit ...
76.7 mm (3.020 inch)
- Clearance of the piston skirt to the cylinder wall ...
0.0525 to 0.0865 mm (0.00210 to 0.00340 inch)
- Service limit ...
0.25 mm (0.010 inch)
- Diameter of the piston pin ...
20.996 to 21.002 mm (0.8266 to 0.8269 inch)
- Service limit ...
20.98 mm (0.826 inch)
- Clearance between the hole for the piston pin and the piston pin ...
−0.004 to +0.004 mm (−0.00016 to +0.00016 inch)
- Service limit ...
0.02 mm (0.0008 inch)
- Diameter of the piston skirt ...
83.948 to 83.963 mm (3.3050 to 3.3056 inch)
C1.5/3013C, C2.2/3024C and C2.2/3024CT
- Service limit ...
83.7 mm (3.295 inch)
- Clearance of the piston skirt to the cylinder wall ...
0.0380 to 0.0720 mm (0.00150 to 0.00283 inch)
- Service limit ...
0.25 mm (0.010 inch)
- Diameter of the piston pin ...
27.996 to 28.000 mm (1.1022 to 1.1024 inch)
- Service limit ...
27.98 mm (1.1016 inch)
- Clearance between the hole for the piston pin and the piston pin ...
−0.001 to +0.007 mm (−0.0004 to +0.0003 inch)
- Service limit ...
0.02 mm (0.0008 inch)
Refer to Specifications, "Cylinder Head" for the piston height for a given gasket thickness.