1982/03/22 Caterpillar

Improved Plunger And New Spring Used In Mechanical Shutoff Group{7418}

Usage:

3304 And 3306 Industrial Engines

Description of Change: An improved plunger and a new spring are used in the mechanical shutoff groups on 3304 and 3306 Industrial Engines. A change was made to the design of the plunger. This change will keep the diaphragm out from behind the head of the plunger. Formerly, it was possible for the diaphragm to get behind the head of the plunger and prevent engine shut-off.

The new spring is made of a different steel that has more resistance to the stresses in this application. The former spring has, at times, broken.

Adaptable As: The improved 3N2817 Plunger and the new 1W9509 Spring are direct replacements for the former 3N2817 Plunger and the former 4B258 Spring. The part number of the plunger did not change.

Location of parts in mechanical shutoff group.

New and former designs of plunger.

Caterpillar Information System:

1982/03/22 Use FT1614 Cover To Protect Center Shaft Assembly{0622,3305,3306,3302,3307}

1982/03/22 Correct Use Of 6V2023 Flow Check Adapter Group Is Important To Prevent Damage To An Engine{0651,0654,1250}

1982/03/22 Caterpillar Electric Starting Motors{1453,1407}

1982/03/22 Use 5P5195 Fuel Line Wrench Correctly{0612,1252}

1982/03/22 Improved Valve Cover Seal Used{1107}

1982/03/22 Engine Replacement{1000}

1982/03/22 Use Correct Torque On Hydraulic Valve Bolts, Nuts And Taperlock Studs{5050}

1982/03/22 Carbon Build-Up In Combustion And Inlet Areas{1058,1101,1105,1214,1104}

1982/03/15 New Oil Pump Outlet Elbow Is Stronger{3314,3310}

1982/03/15 Use The 6V6059 Microlite With The 6V2196 Inspection Microscope{0651}

1982/03/15 New Diaphragm Used In Fuel Ratio Control{1278}

1982/03/15 More Flexible Hose For Use With Hydraulic Flowmeter{0651,5050}

1982/03/29 Parts Book Changes{0374}

1982/03/29 Location Of Sending Unit Changed To Improve Accuracy Of Water Temperature Indication{7453}

1982/03/29 Flywheel Adapters For Dynamometer Testing{1156,0652}

1982/03/29 Multi-Piece Wheel Rims; Caution Must Be Used{4202,4201}

1982/03/29 New Regulator Group Increases Coolant Flow To Cab Heater, Prevents Overcooling{1355}

1982/03/29 Twisted Port Plate Can Cause Excessive Case Drain From Piston Pump Or Motor{5058,5070}

1982/04/05 Lubricant Recommendations Have Been Changed For Vehicular Products{0680,0374,0375,3004,1318,5060}

1982/04/05 Conversion Of 49-State 3406 Truck Engine From 283 kW (380 hp) To 298 kW (400 hp) Arrangements{1000}

1982/04/05 Reminder: Check Valve Lash Adjustment At Correct Intervals{1102}

1982/04/12 Pressure Regulator Group Now Available For Parts Service{3152,3185,3166,3012}

1982/04/12 Use Correct Part Numbers For Main And Connecting Rod Bearings{1230,1203,1219}

1982/04/12 Lock Screw For Threaded Crown On Hydraulic Cylinders No Longer Used{5000}