1996/09/23 Caterpillar


New Mixer Assembly Provides Better Startability And Idle Stability {1266}

Usage:


G3412 (6ZM),
G3512 (7NJ),
G3516 (4EK) Generator Set;
G3412 (7DB),
G3508 (4WD, 2JF),
G3512 (4KC, 5JD),
G3516 (3RC, 8LD) Industrial Engines

A new mixer assembly has been introduced to provide better startability and idle stability for the above engines. The new and current mixer assemblies are identical except for the length and color of the springs.


New 133-7592 Varifuel Mixer Assembly: (1) Spring.

New 133-7592 Varifuel Mixer Assembly contains a silver-coated spring 101.6 mm (4.00 in) long. Current 7E-1598 Varifuel Mixer Assembly contains a yellow-coated (or gold-coated) spring 82.6 mm (3.25 in) long. These two mixer assemblies can work in conjunction or alone.

The longer spring in the new mixer assembly will allow a slower opening of the valve when compared with the shorter spring contained in the current mixer assembly. As a result, the slower opening will allow a leaner gas mixture at lower speeds.

Chart 1 illustrates the current configuration and the new configuration of mixture assemblies possible with the three carburetor assemblies used on the above engines.

Chart 2 lists the applicable engines used with the three carburetor assemblies.

NOTE: The 133-7592 Varifuel Mixer Assembly can be serviced as an assembly or as individual parts.

Chart 3 lists the parts included in 133-7592 Varifuel Mixer Assembly.

Caterpillar Information System:

1996/09/23 New Governor Weight And Race Increase Durability {1264}
1996/09/23 New Piston Rings Extend Valve Service Life {1215}
1996/09/23 Special Instruction, SEHS9246-01, "Using 9U-6860 Tool Group To Replace Unit Injector Sleeves" Is Available {1713}
1996/09/23 New Parts Available To Eliminate Wear Between The Oil Cooler Bonnet And The Elbow {1378,1380}
1996/09/23 Oil Pan Gasket Is Reusable {1302}
1996/09/23 Valve Cover Base Gasket Is Reusable {1120}
1996/09/23 New Non-Metallic Fans For 360 And 440 Frame Generators {1404,7002,1356}
1996/09/23 New Plastic Outlet Sleeve Used On 3208 Engines {1380}
1996/09/23 New Hold-Down Bolts For The Sleeve Metering Fuel System (SMFS) Governor Housing {1251}
1996/09/23 New Improved Camshaft Assemblies Are Used In 3208 Engines {1210}
1996/09/23 New Lifter Assembly Is Available For Turbocharged Engines {1209}
1996/09/23 New Air Cleaner Group Provides Closed Crankcase Breather System {1051,1317}
1996/09/23 Error In The Testing And Adjusting Manuals For Fuel System Adjustment Timing Pin {1272}
1996/09/23 Replacement Turbocharger Cartridge Part Numbers {1056}
1996/09/23 A Chamfer Has Been Added To Some Engine Cylinder Head Bolt Holes To Help Reduce Stress Concentrations And Prevent Cracks {1101}
1996/09/23 New Valve Cover Seals Are Available For Mechanical Unit Injector (MUI) and Electronic Unit Injector (EUI) Engines {1107}
1996/09/23 Addition Of Sleeve And Removal Of Setscrew Prevents Binding Of Control Shaft {1266,7558}
1996/09/23 New Bracket Available To Support Gas Engine Ignition Group Wiring Harness Assembly {1408,1550}
1996/09/23 New Circuit Board Assembly And Modules Improve Serviceability And Reliability {1418,1550}
1996/09/23 Introduction Of New Spark Ignited Single-Cylinder Gasket Kits {7555}
1996/09/23 Caterpillar Now Has Parts Support For Previously Non-Supported Custom Parts {7567}
1996/09/23 Turbocharger Water Wash Procedure {1052}
1996/09/23 Improved Air Cleaner Element Assembly Used {1054}
1996/09/23 New Soot-Filter Available For Use With Air Cleaner Group {1055,1050}
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