Note: The number on the tab groove side of the connecting rod is positioned toward the opposite side of the engine from the camshaft during installation.
139-8502 Piston and Rod Group
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| Illustration 1 | g00287964 |
The 1U-6431 Piston Ring Groove Gauge is necessary for measuring ring grooves in keystone style pistons. Refer to the instruction card that is included within the gauge group for the correct use of the gauge group.
(1) Top piston ring
The ring should be installed with the side marked "UP-1" toward the top of the piston.
(2) Intermediate ring
The ring should be installed with the side marked "UP-2" toward the top of the piston.
When the piston ring is installed in a cylinder liner that has a bore size of 139.66 mm (5.498 inch), the specific clearance between the ends of the piston ring is the following value:
Top ring ... 0.55 ± 0.15 mm (0.022 ± 0.006 inch)
Intermediate ring ... 0.83 ± 0.15 mm (0.033 ± 0.006 inch)
For each 0.03 mm (0.001 inch) increase in the cylinder liner bore size, the clearance between the ends of the piston ring increases by 0.08 mm (0.003 inch).
(3) Oil control ring
The spring ends of the oil control ring should be assembled 180 degrees from the ring end gap. The blue colored portion of the spring must be visible at the ring end gap.
Width of the piston groove for the new oil control ring ... 4.033 ± 0.013 mm (0.1588 ± 0.0005 inch)
Thickness of the new oil control ring ... 3.98 ± 0.01 mm (0.1567 ± 0.0004 inch)
Clearance between the groove and the new oil control ring ... 0.053 ± 0.023 mm (0.0021 ± 0.0009 inch)
Maximum permissible clearance (worn) ... 0.15 mm (0.006 inch)
When the piston ring is installed in a cylinder liner that has a bore size of 139.66 mm (5.498 inch), the specific clearance between the ends of the piston ring is the following value.
Oil control ring ... 0.57 ± 0.19 mm (0.022 ± 0.008 inch)
For each 0.03 mm (0.001 inch) increase in the cylinder liner bore size, the clearance between the ends of the piston ring increases by 0.08 mm (0.003 inch).
(4) Piston pin bore
Bore in piston for pin ... 55.0355 ± 0.0055 mm (2.1667 ± 0.0002 inch)
Diameter of the new piston pin ... 55.000 ± 0.005 mm (2.1654 ± 0.0002 inch)
Clearance between the pin and the bore in the piston ... 0.013 mm to 0.023 mm (0.0005 inch to 0.0009 inch)
133-3360 Piston and Rod Group
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| Illustration 2 | g00287964 |
The 1U-6431 Piston Ring Groove Gauge is necessary for measuring ring grooves in keystone style pistons. Refer to the instruction card that is included within the gauge group for the correct use of the gauge group.
(1) Top piston ring
The ring should be installed with the side marked "UP-1" toward the top of the piston.
(2) Intermediate ring
The ring should be installed with the side marked "UP-2" toward the top of the piston.
When the piston ring is installed in a cylinder liner that has a bore size of 137.16 mm (5.4000 inch), the specific clearance between the ends of the piston ring is the following value:
Top ring ... 0.45 ± 0.10 mm (0.018 ± 0.004 inch)
Intermediate ring ... 0.83 ± 0.15 mm (0.033 ± 0.006 inch)
For each 0.03 mm (0.001 inch) increase in the cylinder liner bore size, the clearance between the ends of the piston ring increases by 0.08 mm (0.003 inch).
(3) Oil control ring
The spring ends of the oil control ring should be assembled 180 degrees from the ring end gap. The white colored portion of the spring must be visible at the ring end gap.
Width of the piston groove for the new oil control ring ... 4.03 ± 0.01 mm (0.1587 ± 0.0004 inch)
Thickness of the new oil control ring ... 3.975 ± 0.015 mm (0.1565 ± 0.0006 inch)
Clearance between the groove and the new oil control ring ... 0.055 ± 0.025 mm (0.0022 ± 0.0010 inch)
Maximum permissible clearance (worn) ... 0.15 mm (0.006 inch)
When the piston ring is installed in a cylinder liner that has a bore size of 137.16 mm (5.4000 inch), the specific clearance between the ends of the piston ring is the following value.
Oil control ring ... 0.575 ± 0.175 mm (0.0226 ± 0.0069 inch)
For each 0.03 mm (0.001 inch) increase in the cylinder liner bore size, the clearance between the ends of the piston ring increases by 0.08 mm (0.003 inch).
(4) Piston pin bore
Bore in piston for pin ... 55.047 ± 0.008 mm (2.1672 ± 0.0003 inch)
Diameter of the new piston pin ... 55.000 ± 0.005 mm (2.1654 ± 0.0002 inch)
Clearance between the pin and the bore in the piston ... 0.017 mm to 0.030 mm (0.0007 inch to 0.0012 inch)