SWITCH (Pressure) 2N7124 - Caterpillar

Engine:
All 3600
All C280
All G3600Engine News SEBD9973, 19 December 2014, "A New Torque Procedure for Connecting Rod Bolts Is Now Used on 3600, G3600, and C280 Engines". The article has been revised to include the new bolts assembly part number.Extensive testing has shown that some tooling can introduce additional stress in the rod bolt during the final turn of the rod bolt torque process. Caterpillar recommends the use of a hydraulic wrench reacting off the rod weight boss, or an impact wrench while performing the final turn portion of the rod bolt torque process to reduce the additional stresses. Caterpillar does not recommend the use of a Pneumatic gun with a reaction arm or breaker bar with an extension to perform the turn portion of the torque process. In addition to using the proper tooling, Caterpillar recommends to reducing the 375 15 N m (277 11 lb ft) torque value to 340 15 N m (250 11 lb ft). Reducing the torque Value maintains the clamp load required for the rod joint, and provides additional margin due to tooling errors that can introduce additional bolt stress. Reuse Information for the Connecting Rod Bolts
Illustration 1 g03743611
(1) 369-7183 Heat Shrink Tube (2) Annular Rings (3) 205-0640 Nut Inspect connecting rod bolts at each service of the connecting rod bearings. There should be no fretting on the shank, knurled or annular ring area (2) of the connecting rod bolt. Ensure that the connecting rod bolt meets the guidelines for the reusable parts. Do not reuse the connecting rod nuts. Prior to installation of the new 467-0537 Bolt As, inspect heat shrink tube (1). The tube serves as an alignment sleeve for the bolts.
The heat shrink tube must be firmly in place and must not move under light finger pressure.
The whole surface of the tube must be smooth.
The tube must not extend into the fillet that is under the bolt head. If a problem is found with the tube, use the following replacement procedure.
Carefully cut the heat shrink tube from the bolt.
Ensure that there is no damage to the shank of the bolt that was under the tube.
Clean the shank of the bolt with solvent in order to remove any oil or molylube.
Install a new 369-7183 Heat Shrink Tube onto the bolt. Position the tube approximately 1.5 mm (0.059 inch) under the bolt head, away from the fillet that is under the bolt head.
Use a heat gun or place the bolt and tube in an oven at 135° 14°C (275° 25°F) for 10 minutes. The tube must shrink into place without any bumps or wrinkles.
After the bolt cools, the tube must be firmly in place. The tube must not move under light finger pressure.
Make sure that the surface of the tube is smooth all around. Verify that the tube does not extend onto the fillet that is under the bolt head. The 467-0537 Bolt As may be tightened for a maximum of five times. The reuse includes