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| Illustration 1 | g00295713 |
Typical example | |
Note: 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.
(1) Top piston ring
- Shape of groove in piston for top ring ... Tapered
- Shape of top ring ... Wedge
- Gap of top ring ... 0.28 to 0.63 mm (0.011 to 0.025 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) Intermediate ring
- Width of groove in piston for intermediate ring ... 2.56 to 2.58 mm (0.1008 to 0.1016 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 0.10 mm (0.003 to 0.004 inch)
- Gap of intermediate ring ... 0.40 to 0.85 mm (0.016 to 0.034 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) Oil control ring
- Width of groove in piston for oil control ring ... 3.54 to 3.56 mm (0.1393 to 0.1401 inch)
- Thickness of oil control ring ... 3.47 to 3.49 mm (0.1366 to 0.1374 inch)
- Clearance between groove and oil control ring ... 0.05 to 0.09 mm (0.002 to 0.003 inch)
- Gap of oil control ring ... 0.25 to 0.75 mm (0.010 to 0.031 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.
Diameter of new piston pin ... 39.694 to 39.700 mm (1.5628 to 1.5630 inch)
Diameter of bore for piston pin ... 39.703 to 39.709 mm (1.5631 to 1.5633 inch)
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| Illustration 2 | g00891548 |
Piston height above top face of cylinder block
- Fastram pistons ... 0.38 to 0.50 mm (0.015 to 0.020 inch)