1990/08/13 Caterpillar

Stronger Fan Guard Resists Vibration Damage{1360}

Usage:

3508 ( 1ZF, 23Z ),
3512 ( 3YF, 24Z ),
3516 ( 4XF, 25Z ) Generator Set Engines

Description of Change: The fan guard has additional support to resist vibration damage. Nine metal support strips are added to provide a more rigid guard assembly. See the illustrations.

Adaptable To: The improved 9Y7645 Fan Guard Assembly is effective with 3508 (23Z2571), 3512 (24Z2716), and 3516 (25Z1611) Generator Set Engines and is adaptable to first production.

Earlier fan guard assemblies can be upgraded by adding nine reinforcement plates to each assembly (two assemblies per machine). Make eighteen plates [863 mm (34") X 20 mm (.8") X 3 mm (.1")] from low carbon steel. Weld these plates in position as shown in the illustrations.

Illustration 1. Front view of the 9Y7645 Fan Guard Assembly. Typical location of the new plates.

Illustration 2. Right side view. Weld (gas metal arc process) all intersecting wires and plates: undercutting not permitted.

Illustration 3. View A-A (right). View B-B (left).

Caterpillar Information System:

1990/08/13 Changes To Exhaust Manifold Expansion Sleeves And Bolts{1059}

1990/08/13 Effective Dates, Serial Numbers And Features OF PEEC Personality Modules{1900,1902}

1990/08/13 Spacer Available To Eliminate Cracks On Ignition Coil Mounting Bracket{1554}

1990/08/06 New Caterpillar Parts Identification Label{7567}

1990/08/06 Rotor Shaft Length Changed{4457,4472}

1990/08/06 New Rotary Solenoid (Brushless Torque Motor) Used In PEEC Engines{1909}

1990/08/06 Coolant Loss In 3406B Truck Engines{1395,1355,1100,1124,1353,1216}

1990/07/30 New Throttle Shaft Bearing Sleeves Used In Governor Housing Assembly{1365}

1990/07/30 New Pistons Used{1225,1214}

1990/07/23 Bearing Information For SR 4 Generators{4471}

1990/07/23 Improvements Reduce Vibration To The Low Water Level Switch On Expansion Tanks{7422,1354}

1990/07/23 Improved Turbocharger Bearing Kit Available For Parts Service{1053}

1990/08/20 New Aftercooler Gaskets Help Maintain Constant Bolt Torque {1063,1079}

1990/08/20 Improvements To Reduce Black Exhaust Smoke {1088,1052,1065,1264,1278,1290,7525}

1990/08/20 Injector Timing Standardized {1272,1290}

1990/08/20 New Manifolds And Bellows Assemblies Used In Exhaust Manifold Group {1059}

1990/09/03 New Latching Fuel Solenoid Assemblies{1259}

1990/09/03 New Service Tools Available{0600,0700}

1990/09/10 New Stainless Steel Plug Used In Aftercooler Core Assembly{1064}

1990/09/10 Engine Oil Lines Group Available To Relocate Oil Filter On 3208 Marine Engines{1318}

1990/09/10 New Alternator Drive Vee Belt Available{1357,1405}

1990/09/10 New Remanufactured 0R6183 Control Group (Personality Module) Available{1902}

1990/09/10 New Timing Specifications{1552}

1990/09/10 Voltage Regulator Droop Connections Are Shown Incorrectly In Service Manuals{4475}