C280 Marine Engines Caterpillar


Connecting Rod

Usage:

C280-08 J4R


Illustration 1g03778192
Typical example

Table 1
Specification for 348-7286 Connecting Rod Gp and 348-7288 Connecting Rod Gp 
Item  Qty  Part  Specification Description 
Bore in the connecting rod for piston pin bushing is 130.000 ± 0.015 mm (5.1181 ± 0.0006 inch)
4P-6125 Bushing  Bore in the bushing for new piston pin is 120.114 ± 0.008 mm (4.7289 ± 0.0003 inch)
227-2902 Bearing  Bore in the bearings for crankshaft before installation is 218.1 ± 0.3 mm (8.59 ± 0.01 inch) 
Bore in the connecting rod for the bearing for crankshaft is 225.000 ± 0.015 mm (8.8583 ± 0.0006 inch)
Distance between the center of the bearings is 600.00 mm (23.622 inch)


Illustration 2g03778193
Typical example

Table 2
Item  Qty  Part  Specification Description 
Angle above centerline on either side of the bushing joint for bushing for the piston pin is 15 degrees. 
For Installation of bushing for the piston pin in the connection rod, heat the connecting rod to a minimum length (G) of 250.00 mm (9.843 inch) at temperature 190 ± 15 °C (374 ± 27 °F) or prior to installation, cool bushing (B) at temperature of −90 °C (−130 °F)


Illustration 3g03778194
Typical example

Table 3
Item  Qty  Part  Specification Description 
369-7181 Bolt As  Use the following procedure in order to tighten the connecting rod bolt:

Do not use the connecting rod bolt assembly, if the dimension is more than 329.00 mm (12.953 inch).
1. Before assembly, assure that the retainer and bolt head are free from Molylube.
2. Before applying thread lubricant, install the bolt into the retainer plate and rod.
3. After installation of bolt, lubricate the threads of the bolt, nut, and contact face of the nut with Bel-Ray Molylube 67700.
4. Turn all four nuts by hand until the nuts contact the face of the cap. No resistance should be felt that would indicate thread damage or debris in the joint. Threading the nut by hand provides an opportunity to identify problems with the threads. If the nuts and/or bolts cannot be threaded by hand, the nuts and/or bolts must be replaced. Do not use an impact wrench to install the nuts up to the face of the cap.
5. Tighten all four nuts (2) to 105 ± 20 N·m (77 ± 15 lb ft).
6. Tighten nut 1, 4, 2, and 3 in the sequence as shown in Illustration 3 to 340 ± 15 N·m (251 ± 11 lb ft).
7. Again, tighten nut 2, 3, 1, and 4 in the sequence as shown in Illustration 3 to 340 ± 15 N·m (251 ± 11 lb ft).
8. Again, tighten nut 1, 4, 2, and 3 in the sequence as shown in Illustration 3 to an angle of 180 ± 5 degrees.

If, torque or turn tolerance are not met in any of the above step. Then, loosen all bolts (1) until zero reading is taken and apply torque again. In order to resue bolt (1), the zero reading should be less than 20000 N (4496 lb)
205-0640 Nut 
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