Type 1
 | |
| Illustration 1 | g00287964 |
Typical example | |
Note: Refer to Guideline for Reusable Parts for information on the pistons, the piston pins, and the retaining rings.
The 1U-6431 Piston Ring Groove Gauge is used for measuring the ring grooves in keystone style pistons. Refer to the Special Instruction that is supplied with the Piston Ring Groove Gauge .
The 5P-3519 Piston Ring Groove Gauge is available for checking the ring grooves with straight sides. Refer to the Guideline for Reusable Parts for instructions on the Piston Ring Groove Gauge .
Top Piston Ring
(1) Top piston ring
Install the piston ring with "UP-1" mark toward the top of the piston.
There is a clearance between the ends of the piston ring. When the piston ring is installed in a cylinder liner with a bore of 137.16 mm (5.400 inch), the clearance is the following value. ... 0.724 ± 0.190 mm (0.0285 ± 0.0075 inch)
There is an increase in the clearance between the ends of the piston rings for each 0.030 mm (0.0012 inch) increase in the cylinder liner bore. Increase ... 0.08 mm (0.003 inch)
Intermediate Piston Ring
(2) Intermediate piston ring
Install the piston ring with "UP-2" mark toward the top of the piston.
There is a clearance between the ends of the piston ring. When the piston ring is installed in a cylinder liner with a bore of 137.16 mm (5.400 inch), the clearance is the following value. ... 1.080 ± 0.190 mm (0.0425 ± 0.0075 inch)
There is an increase in the clearance between the ends of the piston rings for each 0.030 mm (0.0012 inch) increase in the cylinder liner bore. Increase ... 0.08 mm (0.003 inch)
Oil Control Ring
(3) Oil Control Ring
The spring ends of the oil control ring should be assembled 180 degrees from the ring end gap.
Width of groove in new piston for oil control ring ... 3.210 ± 0.010 mm (0.1264 ± 0.0004 inch)
Thickness of new piston ring ... 3.137 ± 0.013 mm (0.1235 ± 0.0005 inch)
Clearance between groove and new piston ring ... 0.073 ± 0.025 mm (0.0029 ± 0.0010 inch)
Maximum permissible clearance of worn ring ... 0.15 mm (0.006 inch)
There is a clearance between the ends of the piston ring. When the piston ring is installed in a cylinder liner with a bore of 137.16 mm (5.400 inch), the clearance is the following value. ... 0.57 ± 0.19 mm (0.022 ± 0.008 inch)
There is an increase in the clearance between the ends of the piston rings for each 0.030 mm (0.0012 inch) increase in the cylinder liner bore. Increase ... 0.08 mm (0.003 inch)
Piston Pin Bore
(4) Piston pin bore
Bore in the piston skirt for the piston pin ... 50.814 ± 0.004 mm (2.0005 ± 0.0002 inch)
Diameter of the new piston pin ... 50.795 ± 0.005 mm (1.9998 ± 0.0002 inch)
Clearance between the piston pin and the bore in the piston ... 0.005 to 0.014 mm (0.0002 to 0.0006 inch)
Type 2
 | |
| Illustration 2 | g01026521 |
Typical example | |
Note: Refer to Guideline for Reusable Parts for information on the pistons, the piston pins, and the retaining rings.
The 1U-6431 Piston Ring Groove Gauge is used for measuring the ring grooves in keystone style pistons. Refer to the Special Instruction that is supplied with the Piston Ring Groove Gauge .
The 5P-3519 Piston Ring Groove Gauge is available for checking the ring grooves with straight sides. Refer to the Guideline for Reusable Parts for instructions on the Piston Ring Groove Gauge .
Top Piston Ring
(1) Top piston ring
Install the piston ring with "UP-1" mark toward the top of the piston.
There is a clearance between the ends of the piston ring. When the piston ring is installed in a cylinder liner with a bore of 144.975 mm (5.7077 inch), the clearance is the following value. ... 0.4 ± 0.10 mm (0.02 ± 0.004 inch)
There is an increase in the clearance between the ends of the piston rings for each 0.030 mm (0.0012 inch) increase in the cylinder liner bore. Increase ... 0.08 mm (0.003 inch)
Intermediate Piston Ring
(2) Intermediate piston ring
Install the piston ring with "UP-2" mark toward the top of the piston.
There is a clearance between the ends of the piston ring. When the piston ring is installed in a cylinder liner with a bore of 144.975 mm (5.7077 inch), the clearance is the following value. ... 0.6 ± 0.10 mm (0.02 ± 0.004 inch)
There is an increase in the clearance between the ends of the piston rings for each 0.030 mm (0.0012 inch) increase in the cylinder liner bore. Increase ... 0.08 mm (0.003 inch)
Oil Control Ring
(3) Oil Control Ring
The spring ends of the oil control ring should be assembled 180 degrees from the ring end gap.
Width of groove in new piston for oil control ring ... 3.02 ± 0.010 mm (0.119 ± 0.0004 inch)
Thickness of new piston ring ... 2.98 ± 0.010 mm (0.117 ± 0.0004 inch)
Clearance between groove and new piston ring ... 0.04 mm (0.002 inch)
Maximum permissible clearance of worn ring ... 0.15 mm (0.006 inch)
There is a clearance between the ends of the piston ring. When the piston ring is installed in a cylinder liner with a bore of 144.975 mm (5.7077 inch), the clearance is the following value. ... 0.55 ± 0.15 mm (0.028 ± 0.006 inch)
There is an increase in the clearance between the ends of the piston rings for each 0.030 mm (0.0012 inch) increase in the cylinder liner bore. Increase ... 0.08 mm (0.003 inch)
Piston Pin Bore
(4) Piston pin bore
Diameter of the bore in the bearing that is installed into the piston skirt for the piston pin ... 59.40 ± 0.04 mm (2.339 ± 0.002 inch)
Diameter of the new piston pin ... 59.945 ± 0.005 mm (2.3600 ± 0.0002 inch)