SEAL 4J3923 - Caterpillar

Illustration 1 g01122229
Typical exampleRefer to Guideline for Reusable Parts And Salvage Operations, SEBF8049, "Piston Visual Inspection" and Guideline for Reusable Parts And Salvage Operations, SEBF8051, "Procedure and Specifications to Inspect and Measure Piston Pins".The 1U-6431 Piston Ring Groove Gauge Gp 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 Gp 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 ringInstall 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. ... 0.550 0.150 mm (0.0217 0.0059 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 ringInstall 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 RingThe 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)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. ... 0.572 0.190 mm (0.0225 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)Orientation of the piston ring gaps after the piston rings have been installed onto the piston. ... 120 degreesImmerse the entire piston body in clean engine oil prior to installing the piston into the engine.Piston Pin Bore
(4) Piston pin boreBore in the piston crown bearing for the piston pin ... 50.40 0.040 mm (1.984 0.0016 inch)Diameter of the new piston pin ... 50.795 0.005 mm (1.9998 0.0002 inch)