SWITCH-PRESSURE 3429794 - Caterpillar

Illustration 1 g02139034
Typical example
Illustration 2 g02139035
Typical exampleA new design of connecting rod (2) has been introduced. The new design of connecting rod has three grades. Refer to table 1 for more information. The new connecting rods have smaller fasteners (3) than the existing connecting rods (1) .Adaptable To: The new connecting rod was introduced from engine serial number E6M02069.
Table 1
Existing Part Number    Grade    New Part Number    Grade    Color    
276-7479     F     331-0291     R     Red    
276-7483     J     331-0290     G     Green    
276-7481     L     331-0292     B     Blue    The new 323-9312 Bolt must be used with the new design of connecting rod (2). The existing 225-5439 Special Bolt must be used with the existing connecting rod (1) .Note: The connecting rods (1) and (2) must not be used in the same engine.New Procedure for Tightening the Fasteners for the Connecting Rod
The existing fasteners for the connecting rod have a torque of 70 N m (52 lb ft). The new 10 mm fasteners have an initial torque of 40 N m (30 lb ft). The new 10 mm fasteners must be tightened through an angle of 120 degrees. The fasteners must be used once.