1985/03/01 Caterpillar


Over Fueling Spring No Longer Used In Governor

Usage:


3406B Industrial, Marine, Generator Set Engines

Description of Change: Tests have shown that the 7N7267 Over Fueling Spring used in the governor on the above engines is not required. See the illustration. The tests also indicate that, in the above engines, the over fueling spring can decrease the engine's ability to start in cold weather.

Adaptable To: The 7N7267 Over Fueling Spring is no longer included in the fuel injection pump groups used on the above engines. The change is in effect with Fuel Injection Pump Serial No. 30148.

The 7N7267 Over Fueling Spring should be removed from earlier fuel injection pump groups used on the above engines if cold weather starting is a problem.

NOTE: To start an engine when the over fueling spring is removed, the operator should push the accelerator pedal to the floor while cranking, then release the accelerator pedal when the engine begins to run.


Location of 7N7267 Over Fueling Spring.

Caterpillar Information System:

1985/03/01 A New Book "Analyzing Diesel And Natural Gas Engine Valve Failures" Is Available
1985/03/01 New Service Tools Available
1985/02/01 1985 Customer Training Available At Caterpillar Dealers (North America)
1985/02/01 Tighten Bolts To Correct Torque In 3161 Governor
1985/02/01 Only The External Needle Valve Can Be Adjusted On Woodward EG3PC Or EG10PC Actuators
1985/02/01 New Air Cleaner Groups And Valve Mechanism Cover Group Used
1985/02/01 Wiring Harness Conduit Component Sizes
1985/02/01 New Temperature Recorders Available
1985/02/01 New Rear Crankshaft Seal Has Longer Service Life
1985/02/01 New Service Tools Available
1985/02/01 Install Crankshaft Thrust Bearings Correctly To Avoid Damage
1985/02/01 Addition Of Lubricator Will Help Prevent Corrosion In Air Prelube Motors
1985/03/01 Exhaust Clamp Nut Now Serviced Separately
1985/03/01 Do Not Weld On Painted Surfaces
1985/03/01 New Pressure Conversion Chart Available
1985/03/01 Bleed Holes On Parts Service Cylinder Heads
1985/03/01 New Cooling System Temperature Regulator Available
1985/03/01 Use The Correct Oil In Natural Gas Engines
1985/03/01 New Drive Coupler Kit Used On Altronic Magneto
1985/03/01 New Crankshaft Seal Groups Used On More 3400 Series Engines
1985/03/01 Increased Preload Used In Air Shutoff Actuators
1985/03/01 New Transmission Control Valve And Pressure Relief Valve Are Used With High Flow Oil Pump
1985/03/01 Input Shaft And Flange Available As An Assembly; Makes Alignment Easier
1985/03/01 Dowtherm 209 Full-Fill Coolant
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