1998/03/01 Caterpillar

The Ignition Bulkhead Connector Reoriented To Help Prevent Moisture Damage{1408}

Usage:

G3508 (4WD, 9TG),
G3512 (5JD, 7NJ),
G3516 (8LD, 4EK) Engines

The ignition bulkhead connector (1), where the primary ignition connects to the internal ignition system through the front service cover, has been reoriented on new and service repair wiring harnesses so that the wiring harness (2) is pointed downward (see Illustration 1). Formerly, the connector (1) was positioned so that the wiring harness (2) was pointed upward (see Illustration 2). When the wiring harness was pointed upward, moisture could become trapped in the connector and seep through the potting compound. This could cause an electrical short circuit of the primary ignition. The new connector orientation will help prevent moisture from collecting in the connector.

Illustration 1.
(FRONT VIEW OF ENGINE) New orientation of bulkhead connector (1) and wiring harness (2).

Illustration 2.
(FRONT VIEW OF ENGINE) Former orientation of bulkhead connector (1) and wiring harness (2).

Caterpillar Information System:

1998/03/01 Process Changes Result In Improved 3500 Engine Remanufactured Connecting Rod Assembly{1218}

1998/03/01 New Pump Group Used In Auxiliary (Fresh Water) Pump Group For Separate Circuit Aftercooler (SCAC){1371}

1998/03/01 New Piston Cooling Jet Tube Assembly Provides Increased Piston Clearance{1331}

1998/03/01 Be Sure To Use The Correct Inlet And Exhaust Valves In Engines Equipped With Valve Bridges That Do Not Ride On Dowels{1105,1121}

1998/03/01 New More Efficent Turbocharger And Exhaust Bypass Group For The G3406 Low Compression Ratio Gas Engines{1057,1052}

1998/03/01 Improved Governor Raise/Lower Motor Used In Governor Control Groups{1264}

1998/03/01 Caterpillar Electronic Technician (ET) Training Video Available{0374}

1998/03/01 8N-4617 Air Cleaner Clamp Kit Available{1051}

1998/03/01 Replacements Products Available For 4C-4079 Brake And Component Cleaner{0680}

1998/03/01 Replacement Available For 7M-7260 Liquid Gasket{0648,0649,0651}

1998/03/01 Use 1U-9500 Flow Communicator On Caterpillar Diagnostic Tools{1250,0782}

1998/03/01 Use 126-7175 Push Puller Assembly For Various General Purpose Applications{0600}

1998/03/01 Air Quality Requirements For Turbocharger Air Impingement System{1052}

1998/03/01 A New Chrome Plated Steel Thrust Washer Is Used In The Air Lines Groups{1058,1079}

1998/03/01 New Exhaust Valve Used In Cylinder Head Groups{1105}

1998/03/01 Current Woodward EGB29P Actuator Assemblies Used On 3600 Diesel Engines{1716}

1998/03/01 Metal Particle Detector{7400}

1998/03/01 Stainless Steel Instrument Lines Groups Improved{7451}

1998/03/01 New Control Panel Films For SR4B Generators Which Are Not To Be Used In Delta Connection{4450}

1998/03/01 Improvement To Reduce Incidence Of 190-02 Diagnostic Code On Electronic Modular Control Panel II (EMCP II) Or Electronic Modular Control Panel II+ Equipped Generator Sets{4490}

1998/04/01 Lower O-Ring Seal Removed From Mechanical Fuel Injector Group{1290}

1998/04/01 Stronger Injector Hold Down Bolt Used In Fuel Injection Pump Groups{1290}

1998/04/01 New Coolant Hose For Exhaust Bypass Valve{1380,1057}

1998/04/01 New Improved Inlet Manifold (Flame Arrestor) Gasket{1058}