1992/09/21 Caterpillar


New Fuel Injection Pump Groups Have Larger Diameter Camshaft Bores, New Lifter Assembly, And Shorter Plunger And Barrel Assembly{1251,1253,1281,1292}

Usage:


3406B And 3406C Engines

SUPPLEMENT: May 17, 1993

September 21, 1992; Page 9; "New Fuel Injection Pump Groups Have Large Diameter Camshaft Bores, New Lifter Assembly, And Shorter Plunger And Barrel Assembly " on 3406B and 3406C Engines.

At the end of the article add the information about effectivity that follows:

--------------- END SUPPLEMENT ---------------

New fuel injection pump groups are used. These new groups include new 7E5888 Fuel Pump Housing (1). This housing has larger diameter fuel pump camshaft bores. This allows the use of new camshaft (2) with a larger camshaft lobe base circle. New lifter assembly (3) and new plunger (4) and barrel (5) assembly are shorter to accommodate the new camshaft. Earlier longer plunger and barrel assemblies and lifter assemblies will not work with the new camshaft.


Illustration 1. Location of new components in fuel injection pump groups. Housing (1). Camshaft (2). Lifter Assembly (3). Plunger (4). Barrel (5). Bonnet (6). 7E4847 O-Ring Seal (7). Bushing (8).

The shorter plunger and barrel assembly may contain a single or double scroll plunger. (See the Illustration 2.) Any fuel injection pump group that uses 4P7681 Fuel Injection Pump Groups, may have any combination of single or double scroll 7E6007 Plunger and Barrel Assemblies. This mixture of single and double scroll plungers will not affect the engine performance. The second scroll helps hydraulically balance the plunger.


Illustration 2. End view of 7E6007 Plungers (4). Single scroll plunger (A). Double scroll plunger (B). Shut-off slot (C).

New 7E4847 O-Ring Seal (7) is used between bonnet (6) and bushing (8). The new seal has a blue teflon coating to help prevent the seal from being damaged during installation. The new seal replaces the former 6V5393 O-Ring Seal.

The new components, when used together, are adaptable to the Fuel Injection Pump Groups that follow:

Caterpillar Information System:

1992/09/21 New Plug And O-Ring Can Help Prevent Oil Leakage At The Flywheel Housing Gasket{1157,1307}
1992/09/21 Replacement Mechanical Temperature And Pressure Gauges (Indicators) Retained By Push-On Metal Retainers{7450}
1992/09/07 Major Engine Component Changes{1201,1202,1205,1218,1219,1230,1253,1288,1331}
1992/09/07 Governor Specifications Are Available Through The Technical Information System{1264,0374}
1992/08/31 Supplemental Coolant Additive Requirements{1352,1395,1063}
1992/08/31 Connecting Rod Bearing Eliminates The Need For Mid-Life Connecting Rod Bearing Roll-In{1219,1202}
1992/08/31 Be Sure The Fuel Injection Pump Housing Is Compatible With 0R0715 And 0R2545 Remanufactured Short Blocks{1201,1253}
1992/08/31 New "3406B Engine Instructor Manual" Available{0374}
1992/08/31 New Deutsch HD-10® Electrical Connectors Used{1400}
1992/08/24 New Cylinder Head Group Provides Lower Valve Guide Temperatures {1100,1104,1112,1123}
1992/08/24 Reusability of Exhaust Valves in All Caterpillar Engines {1105}
1992/08/24 New Electronic Unit Injector (EUI) With New Style Solenoid Used; New Unit Injector Wiring Group Used {1290}
1992/09/28 New Self Locking Bolt Used On Engine Side Covers {1201}
1992/09/28 Service Tools Available {0600,0700}
1992/09/28 New NEXG4516 Marine/Industrial Service Program Module(SPM) Available {1900,0782}
1992/10/05 Thicker Head Gaskets Available For Use With Resurfaced Cylinder Blocks{1124}
1992/10/05 New Cylinder Head Groups Provides Lower Valve Guide Temperatures{1100,1104,1112,1123}
1992/10/05 Product Support Literature{0374}
1992/10/12 Improved Hour Meters (Electric){7450,7480}
1992/10/26 Improved Windshield Wiper Motor Crank Assemblies Available For Parts Service{7305}
1992/10/26 3406 Truck Engine Component Update{1052,1119,1201,1202,1205,1214,1218,1254,1288,1803}
1992/11/09 Correct Identification Of Rocker Arm Assembly Components{1123}
1992/11/09 Relay Replacement Kits Available To Replace Relays In Engine Mounted Junction Box{1423,1422}
1992/11/09 Replacement Governors For Early Engines{1264}
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