3054B Naturally Aspirated Engine
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| Illustration 1 | g00642351 |
Note: The word "Front" or an arrow which is marked on the piston crown must be toward the front of the engine. If the piston crown is not marked, put the narrowest side of the piston crater toward the side of the engine with the fuel injection pump. The shortest distance between the edge of the piston crater and the edge of the piston is the narrowest side of the piston crater.
Note: Ensure that the ring end gaps of all the piston rings have 120 degrees spacing from each other.
Note: Refer to the Systems Operation, Testing and Adjusting Module, "General Information" topic for the location of the serial number plate.
(1) Top piston ring
- Shape of the ring groove in the piston for top piston ring ... Parallel
- Shape of the top piston ring ... Parallel
- Width of the ring groove in the piston for the top piston ring ... 2.60 to 2.62 mm (0.102 to 0.103 inch)
- Thickness of the top piston ring ... 2.475 to 2.49 mm (0.097 to 0.098 inch)
- Clearance between the ends of the top piston ring in a cylinder without any wear ... 0.28 to 0.51 mm (0.011 to 0.020 inch)
Note: When you install a piston ring, make sure that the word "TOP" is facing the top of the piston. New top piston rings have a red identification mark which must be on the left of the ring end gap when the top piston ring is installed on an upright piston.
(2) Intermediate piston ring
- Width of the groove in the piston for the intermediate piston ring ... 2.56 to 2.58 mm (0.101 to 0.102 inch)
- Thickness of the intermediate piston ring ... 2.48 to 2.49 mm (0.097 to 0.098 inch)
- Clearance between the ring groove in the piston and the intermediate piston ring ... 0.07 to 0.11 mm (0.003 to 0.004 inch)
- Clearance between the ends of an intermediate piston ring in a cylinder without any wear ... 0.30 to 0.63 mm (0.012 to 0.025 inch)
Note: When you install a piston ring, make sure that the word "TOP" is facing 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.
(3) Oil control ring
- Width of the ring groove in the piston for the oil control ring ... 3.53 to 3.55 mm (0.139 to 0.140 inch)
- Thickness of the oil control ring ... 3.47 to 3.49 mm (0.136 to 0.137 inch)
- Clearance between the ring groove in the piston and the oil control ring ... 0.05 to 0.09 mm (0.002 to 0.004 inch)
- Clearance between the ends of an oil control ring in a cylinder without any wear ... 0.30 to 0.63 mm (0.012 to 0.025 inch)
Note: A 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.
(4) Piston pin
- Diameter of new piston pin ... 39.694 to 39.700 mm (1.5628 to 1.5630 inch)
- Bore in piston for pin ... 39.703 to 39.709 mm (1.5631 to 1.5633 inch)
Piston height above cylinder block (not shown) ... 0.36 to 0.50 mm (0.014 to 0.020 inch)
3056 Naturally Aspirated Engine
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| Illustration 2 | g00295711 |
(1) Width of groove in piston for top ring ... 2.57 to 2.59 mm (0.101 to 0.102 inch)
Thickness of top ring ... 2.48 to 2.49 mm (0.097 to 0.098 inch)
Clearance between groove and piston ring ... 0.08 to 0.11 mm (0.003 to 0.004 inch)
Clearance between the ends of the top ring with a cylinder liner without any wear ... 0.40 to 0.85 mm (0.016 to 0.033 inch)
(2) Width of groove in piston for intermediate ring ... 2.55 to 2.57 mm (0.100 to 0.101 inch)
Note: Install the word "Top" toward the top of the piston. New top rings have a red identification mark which must be on the left of the ring gap when the top ring is installed on an upright piston.
Thickness of intermediate ring ... 2.48 to 2.49 mm (0.097 to 0.098 inch)
Clearance between groove and intermediate ring ... 0.06 to 0.09 mm (0.002 to 0.003 inch)
Clearance between the ends of the intermediate ring with a cylinder liner without any wear ... 0.30 to 0.76 mm (0.012 to 0.030 inch)
(3) Width of groove in piston for oil control ring ... 4.030 to 4.060 mm (0.1587 to 0.1598 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.
Thickness of oil control ring ... 3.980 to 3.990 mm (0.1566 to 0.1571 inch)
Clearance between groove and oil control ring ... 0.04 to 0.08 mm (0.002 to 0.003 inch)
Clearance between the ends of oil control ring with a cylinder liner without any wear ... 0.38 to 0.84 mm (0.015 to 0.033 inch)
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.
(4) Diameter of new piston pin ... 34.920 to 34.925 mm (1.3748 to 1.3750 inch)
Bore in piston for pin ... 34.928 to 34.934 mm (1.3751 to 1.3754 inch)
Piston height above cylinder block (not shown) ... 0.140 to 0.360 mm (0.0055 to 0.0142 inch)
3054 and 3056 Turbocharged Engines
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| Illustration 3 | g00295711 |
(1) Shape of groove in piston for top ring ... Taper
Shape of top ring ... Taper
Clearance between the ends of top ring in a cylinder liner without any wear ... 0.35 to 0.75 mm (0.014 to 0.030 inch)
Note: Install the word "Top" toward the top of the piston. New top rings have a red identification mark which must be on the left of the ring gap when the top ring is installed on an upright piston.
(2) Width of groove in piston for intermediate ring ... 2.56 to 2.58 mm (0.101 to 0.102 inch)
Thickness of intermediate ring ... 2.48 to 2.49 mm (0.097 to 0.098 inch)
Clearance between groove and intermediate ring ... 0.07 to 0.11 mm (0.003 to 0.004 inch)
Clearance between the ends of an intermediate ring in a cylinder liner without any wear ... 0.30 to 0.76 mm (0.012 to 0.030 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.
(3) Width of groove in piston for oil control ring ... 4.040 to 4.060 mm (0.1591 to 0.1598 inch)
Thickness of oil control ring ... 3.98 to 3.99 mm (0.156 to 0.157 inch)
Clearance between groove and oil control ring ... 0.05 to 0.08 mm (0.002 to 0.003 inch)
Clearance between the ends of an oil control ring in a cylinder liner without any wear ... 0.38 to 0.84 mm (0.015 to 0.033 inch)
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.
(4) Diameter of new piston pin ... 38.095 to 38.100 mm (1.4998 to 1.5000 inch)
Bore in piston for pin ... 38.103 to 38.109 mm (1.5000 to 1.5004 inch)
Piston height above cylinder block (not shown)
Quadram pistons ... 0.14 to 0.36 mm (0.006 to 0.014 inch)
Fastram pistons ... 0.38 to 0.50 mm (0.015 to 0.020 inch)