CYLINDER & LINES GP-LIFT 4175997 - Caterpillar

General Note:
All torques specified in this manual are assembly torques and typically can be expected to fall off after assembly is accomplished. DO NOT RETORQUE after initial assembly torques fall unless instructed otherwise. A compiled listing of torque specifications is presented in the Torque Specifications section of this manual. To convert inch pounds of torque to foot pounds of torque, divide in pounds by 12.inch pounds ÷ 12 = foot poundsTo convert foot pounds of torque to inch pounds of torque, multiply foot pounds by 12.foot pounds × 12 = inch poundsInstalling Crankshaft
Press new sleeve bearings in the end cover and crankcase. Ensure that the slot in the bearings line up with the oil passages in the end cover or crankcase. If you have a model with no oil passage present in the crankcase, press the sleeve bearing into the crankcase with the slot located 90 degrees from vertical.Install the front thrust washer with the tang inserted in the slot toward the flange. Insert the crankshaft and the rear thrust washer with the tang toward the rear of the compressor.Place the oil seal ring on the boss of the rear end cover and install the end cover making sure not to pinch the seal ring. Ensure the tang of the thrust washer is inserted in the slot of the end cover. Fasten the end cover to the crankcase with the four cover cap screws. Torque the cap screws to 20 - 25 N m (175 - 225 lb in) in a crossing pattern.Pistons And Connecting Rods
If the pistons are to be replaced ensure that the correct pistons are being installed. Note that the pistons for the Tu-Flo 550 compressor are similar to those of other Bendix compressor models but may be identified by the piston diameter of 70.16 mm (2.780 in) and the distance to the center of the wrist pin from the top of the piston of 31.75 mm (1.250 in).Piston Rings
Check each ring end gap in a cylinder bore before installation. Place the ring in the top of the cylinder bore and using the piston, push the ring to the mid-point of the cylinder bore and check the ring gap. If the end gaps are incorrect either the wrong repair size has been purchased or the compressor is worn beyond specification and should be replaced.Install the rings on the pistons per the following instructions starting at the center of the piston and moving outward.
Fig 14 Piston And Rings1. Install the spacer and segment rings as follows: Place spacer ring (25) in the piston groove, the ends of the spacer must butt and not overlap. Install top segment (24) by inserting one end above the spacer in the ring groove, 120 degrees from the spacer ends and wind the segment into position. Install the bottom segment in the same manner beneath the spacer making sure the gap is staggered 120 degrees from both the top ring segment and the spacer end gaps. Before using be sure both