1991/04/08 Caterpillar


New Carburetor Control Leakage Improves Idle Stability{1266}

Usage:


3508 ( 2JF ),
3512 ( 4KC ),
3516 ( 3RC ) Spark-Ignited Engines Equipped With EG3P Actuators

Description of Change: A new carburetor control linkage is used in the carburetor control groups. The new linkage is designed to improve linkage alignment at the actuator and use more actuator travel.

Adaptable To: See the chart for the parts affected by this change. The illustration shows the typical location of the new parts. This change is effective with 3508...2JF128, 3512...4KC190, 3516...3RC303 Spark-Ignited Engines equipped with EG3P Governors, and is adaptable to first production. To adapt this change to an earlier engine, see the following procedure.

Procedure To Adapt The New Carburetor Control Linkage To An Earlier Spark-Ignited Industrial Engine

1. Rotate the governor shaft clockwise to the full open position.

2. Install new 4P0708 Governor Control Lever (2) at five degrees (plus or minus five degrees) above horizontal.

3. Adjust 8G1825 Rod (1) to dimension (A) of 254 + 1.0 mm (10 + .04 in) center length. See illustration.

4. Install rod, 9M1974 Hard Washer (4), and 4B3388 Bolt (3).


Right side view of typical carbuetor control group. Location of the new parts. See the chart for the part descriptions. The eyelets can be reused.

Caterpillar Information System:

1991/04/08 New Bolt Improves Retention Of Backplate To Housing Assembly In Turbocharger Cartridge Groups{1052,1053,1056,7553}
1991/04/08 Two Different Air Inlet Heater Control Modules Available{1090,1087,1058}
1991/04/01 Continuous Single Cylinder Misfire When Engine Is Under Load {1552}
1991/04/01 Remanufactured Type 1 Fuel Injector Assembly Available For 3500 Family Of Engines Equipped With UG8 Governors {1254,1264}
1991/04/01 Fuel Injection Pump Bushing Torque Increased {1253}
1991/04/01 New Performance Category For Engine Crankcase Oil {1318}
1991/04/01 Correct Position Of Lockwashers For Electrical Components With Screw Terminals {1400,7553}
1991/03/25 New Cylinder Blocks And Crankshafts Used{1201,1202,1231}
1991/03/25 New Shaft Bracket And Oil Supply Plug Used In Rocker Valve Shaft Assembly{1102,7553}
1991/03/18 New Air Compressor Crankshaft Has Improved Spline Lubrication{1803}
1991/03/11 4C6534 Harness Now Available To Set Engine Electronic Speed Switches{7427,0779,0785}
1991/03/11 1U5269 Mirror Tube Used With 1U5268 Borescope May Become Scratched{0777}
1991/04/08 Remote Mounted Pressure Sensor Used In Temperature And Pressure Control Group In Electronic Modular Control Panel (ECMP){4490}
1991/04/15 Simplified Battery Test Procedure SEHS7633-02 And Battery Test Sheet SEHS9326 Available{1401}
1991/04/15 New Specification For Transmission And Drive Train Oil (TDTO){0645,3004,3150,3179}
1991/04/15 New Auxiliary Water Pump Used; New Chart Lists Auxiliary Water Pump Group Numbers, Pulley Sizes, And Drive Belts{1371,1357,1384}
1991/04/15 New Shaft Bracket And Oil Supply Plug Used In Rocker Valve Shaft Assembly{1102,7553}
1991/04/15 New Oil Filter Element Assembly Used In Oil Filter Groups{1318}
1991/04/22 Procedure For Applying 1U8846 Gasket Maker{0648,7555}
1991/04/22 Procedure To Set Voltage Droop On SR 4 Generators With VR3 Voltage Regulators Using Resistive Load Bank{4475,4467}
1991/04/22 6L7896 Starting Motor (24V DC) Is No Longer Available From Caterpillar{1453}
1991/04/22 New Diagnostic Code 28 "Check Throttle Sensor Adjustment" Is On 1991 Engines{1900}
1991/04/22 Special Instruction, SEHS9340, Gives Jacket Water Heater Installation Procedures{1383}
1991/04/22 Improved Turbocharger Water Lines Group Eliminates Tube Cracking And Coolant Loss{1380,1052}
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