1996/05/13 Caterpillar

New Stronger Cylinder Head Bolts Used {1100}

Usage:

Caterpillar Machines Powered By 3406C (11N, 41Z) Engines

Description of Change: New cylinder head bolts are used in these machine engines. The new stronger bolts meet or exceed SAE Grade 8 tensile strength and proof load tests. The 3/4- 16 UNF threads are rolled into the bolts after heat treat. The new bolts can be identified by the standard "Grade 8" bolt head marking of six equally spaced marks radiating outward on the top of the 12 point bolt head. See the illustration.

Identification "Marks" on top of bolt heads on the new 124-1854 and 124-1855 Cylinder Head Bolts.

Adaptable To: The new 124-1855 Bolt [3/4- 16 UNF thread, 194.0 mm (7.64 in) long] replaces the former 9X-8904 Bolt. Twenty 124-1855 Bolts are used on each cylinder head. The 6 rocker arm bracket bolts remain unchanged. The new cylinder head bolts are effective with 3406C (11N14822, 41Z242) Machine Engines and are adaptable to all earlier 3406C Machine Engines including the (70V) serial number range.

Caterpillar Information System:

1996/05/13 Improved Transmission Downshift Switch Available {1435,1400}

1996/05/06 Starter Solenoid Assembly May Need New Terminal {1467,1518}

1996/05/06 Low Profile Exhaust Pipe Available {1061}

1996/05/06 Transmission Oil Change Refill And Start-up Procedure {3004}

1996/05/06 New Body Pivot Pins Now Used {7258}

1996/05/06 Wheel Bearing Adjustment Intervals {4201,4208}

1996/05/06 Improvements To Challenger Agricultual Tractors Air Conditioning Available {7320,7343,7311}

1996/05/06 Steering Pump Pressure Limiter Logic Plugs Can Be Checked For Proper Torque {4306}

1996/05/06 High Performance Grease Used On Brake Control Linkage {4269}

1996/05/06 Service Magazine Special Edition, SEPD0304, Available {0374}

1996/05/06 Cast Duo-Cone Seals Available For Final Drives {4052,7561}

1996/04/29 New Element Assemblies Available Within Jacket Water Heater Groups{1383}

1996/05/13 Torque Check Necessary For Front Support Bracket Bolts When Damper And Pulley Are Removed {1153}

1996/05/13 New Components In Engine Camshaft Groups Provide Increased Lubrication To Thrust Washer Assembly {1210}

1996/05/20 New Assembly Procedure For Hoist Pump Groups With Double Shaft Seals And Weep Hole{5073}

1996/05/20 Hydraulic Tank Breather Location Change Affects Tank Filling Procedure{5056}

1996/06/03 Latches May Not Secure Radiator Guard Properly, Without Correct Panel Position{7155}

1996/06/03 Additional Transmission Clutch Piston Return Springs Have Been Added To Improve Service Life In Off-Highway Trucks{3150}

1996/06/03 Field Repair For Cracked Upper Strut Mount Plate{7051}

1996/06/03 Long Life Coolant Antifreeze (LLCA) Used In Cooling System{1395}

1996/06/03 U-Cup Rod Seals Available For Hydraulic Cylinders Used In Cold Temperatures{5102,5104}

1996/06/03 Improved Governor Servo Components Available For Use With Energize To Run Solenoids; Energize To Run Solenoid Stop Bolt Adjustment Procedure{1264,1259}

1996/06/03 New O-Ring Seal Improves Engine Initial Combustion Gas Sealing{1290}

1996/06/10 Hydraulic Valve Groups Use New Implement Quick Couplers {6129,5057,5051}