Improved 7C1757 Exhaust Manifold Group
Usage:
3176 Truck Engines
Description of Change: The exhaust manifold group has been improved to eliminate bolt loosening. The new exhaust manifolds have thicker flanges to reduce deflection and improve gasket retention. The thicker flanges require new bolts and spacers. Bolt locks are now used at cylinders 3 and 4.
Adaptable To: The part number of the improved 7C1757 Exhaust Manifold Group has not changed. The chart and illustration identify the new components. The new components are adaptable to earlier engines when used together.
Location of components.
Caterpillar Information System:
1990/10/01 Price Adjustments On Service Program Modules
1990/10/01 Setscrew And Nut Available For Fuel Setting And Injector Synchronization
1990/09/01 New Remanufactured 0R6183 Control Group (Personality Module) Available
1990/09/01 Incorrect Throttle Adjustment Can Cause Engine Surge
1990/09/01 Correct Light Bulb Replacement For The 8T9290 Borescope; New Light Bulb Used
1990/09/01 New Service Tools Available
1990/09/01 Sealing Threads On Switches And Sensors That Are Grounded Through The Case
1990/08/01 New Caterpillar Parts Identification Label
1990/08/01 Coolant Loss In 3406B Truck Engines
1990/08/01 New Pistons Used
1990/08/01 New Rotary Solenoid (Brushless Torque Motor) Used In PEEC Engines
1990/08/01 Effective Dates, Serial Numbers And Features Of PEEC Personality Modules
1990/10/01 Front Trunnion Bolts May Come Loose
1990/10/01 Increased Capacity Oil Sumps Require Additional Oil And Different Maintenance Interval
1990/10/01 New Exhaust Valves Are Used In Caterpillar Remanufactured Cylinder Heads
1990/10/01 Engine Service Training Literature Uses New Form Number
1990/10/01 New 4C5084 Oil Filter Cutter Replaces Former 6V7905 Filter Cutter
1990/10/01 4C6600 Battery Voltmeter For Determining Battery Percent Of Charge
1990/10/01 List Of Service Publications
1990/11/01 New Shim Improves Low Idle Stability Of Governor
1990/11/01 New Stronger Exhaust Valve Push Rod Used In Valve Mechanism Groups
1990/11/01 New Exhaust Manifold Bolt Tightening Procedure
1990/11/01 Modification Of 1U7791 Valve Seat Driver
1990/11/01 Some Components Of The 7E3580 Engine Adapter Group For Allison AT545, MT543D, And MT653DRD Transmissions Are Not Serviced By Caterpillar