3608 Engine Caterpillar

Piston and Rings

Usage:

3608 1ZD

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Illustration 1	g00520356

(1) The top ring must be installed with the yellow colored strip to the right of the ring end gap. Install the top ring with the "UP-1" facing upward.

(2) The intermediate ring must be installed with the green colored strip to the right of the ring end gap. Install the intermediate ring with the "UP-2" facing upward.

(3) The third ring must be installed with the red colored strip to the right of the ring end gap. Install the "UP-3" facing upward.

(4) Install the oil control ring and the ring expander with the gaps at an angle of 180 degrees across from each other. The white colored portion of the ring expander must be visible through the oil control ring gap.

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Table 1
Piston and Piston Rings
	(1) Top Ring	(2) Intermediate Ring	(3) Third Ring	(4) Oil Control Ring
Width Of Groove In New Piston	5.160 ± 0.010 mm (0.2031 ± 0.0004 inch)	5.160 ± 0.010 mm (0.2031 ± 0.0004 inch)	5.050 ± 0.010 mm (0.1988 ± 0.0004 inch)	8.050 ± 0.010 mm (0.3169 ± 0.0004 inch)
Width Of Piston Ring	4.982 ± 0.007 mm (0.1961 ± 0.0003 inch)	4.982 ± 0.007 mm (0.1961 ± 0.0003 inch)	4.915 ± 0.025 mm (0.1935 ± 0.0010 inch)	7.925 ± 0.011 mm (0.3120 ± 0.0004 inch)
Clearance Between Groove and Piston Ring	0.178 ± 0.017 mm (0.0070 ± 0.0007 inch)	0.178 ± 0.017 mm (0.0070 ± 0.0007 inch)	0.135 ± 0.035 mm (0.0053 ± 0.0014 inch)	0.125 ± 0.021 mm (0.0049 ± 0.0008 inch)
Piston Ring End Gap⁽¹⁾	1.40 ± 0.10 mm (0.055 ± 0.004 inch)	1.40 ± 0.10 mm (0.055 ± 0.004 inch)	1.35 ± 0.15 mm (0.053 ± 0.006 inch)	1.10 ± 0.20 mm (0.043 ± 0.008 inch)

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⁽¹⁾	The given value is for rings that are installed in a bore of 280 mm (11.024 inch).

Bore in piston for pin ... 120.028 ± 0.008 mm (4.7255 ± 0.0003 inch)

Diameter of piston pin ... 119.994 ± 0.006 mm (4.7242 ± 0.0002 inch)

Clearance between piston pin and bore in piston ... 0.034 ± 0.014 mm (0.0013 ± 0.0006 inch)

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