1988/12/12 Caterpillar

New Mounting Bolts Used In Aftercooler Housings{1063,1058}

Usage:

All 3306, 3306B Engines With Turbochargers And Aftercoolers

SUPPLEMENT: 01/23/89

SERVICE MAGAZINE; DECEMBER 12, 1988; PAGE 5; "New Mounting Bolts Used In Aftercooler Housings" on all 3306, 3306B Engines with turbochargers and aftercoolers. The 4N8267 Aftercooler Group is also effective with 3306B Vehicular Engine 13Z18266.

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

Description of Change: Self-locking bolts are now used in the four locations on aftercoolers where short bolts are used on 3306B Engines. The self-locking bolt has better torque retention capabilities than the former bolts.

Adaptable To: The new 343557 Bolt is a direct replacement for the former 1A2029 Bolt. The new bolt is effective as shown in the chart and is adaptable to all earlier engines. The new bolt should be tightened to the standard torque of 45 ± 7 N·m (32 ± 5 lb ft).

Caterpillar Information System:

1988/12/12 Revised Instructions For Installation of New Maintenance Free Batteries{1401,1400}

1988/12/05 Improved Air Conditioner Thermostat Switches Have Tin-Plated Internal Parts{7320}

1988/11/28 Bleed Holes Now In Paddle In Air Inlet Shutoff Groups {1078}

1988/11/28 Potentiometer Can Be Used In Place Of Temperature Probe For Demonstration Of Electronic Modular Control Panel {0315,7418}

1988/11/28 More Charts And Decals Available For Lubrication And Maintenance Intervals {0374,0375,7500}

1988/11/21 Excitation Portion Of Generators Changed To Give Longer Shaft Life{4454,4470}

1988/11/21 Fuel Priming Pump Available As An Attachment{1258}

1988/11/21 One-Piece Tappet (Follower) Used In 11 mm (Type 2) Fuel Injectors{1290}

1988/11/21 New Oil Seal For Water Pumps Has Hydrodynamic Grooves{1361,1389}

1988/11/21 Rechargeable Portable Printer Available{0782,1050,1250}

1988/11/21 Improved Pressure Gauge Sender Used{7450,7485}

1988/11/21 Be Sure To Follow Cooling System Recommendations{1350}

1988/12/12 Maintenance Procedure Extends Service Life Of Exhaust Manifold Studs{1050}

1988/12/12 New Alternator Drive Pulley Has Hardened Wear Sleeve; New Seal Used On Pulley{1425,1357}

1988/12/12 Oil Cooler Bypass Elbow Changed To Prevent Bypass Valve Seizure{1314,1318}

1988/12/12 Valve Kit Available For Explosion Relief Valve{1201,1233}

1988/12/19 New Material Used For Rotating Seal Rings In Some Power Shift Transmissions, Steering Clutches And Torque Converters {3101,3150,4100}

1988/12/19 New Camshafts Used; Camshaft Installation Kits Available {1209,1210}

1988/12/19 Check Assembled Dimension For Rack Lever Travel If Governor Housing Assembly Is Replaced {1264}

1988/12/19 Larger Valve Springs Must Be Used With Williams Blue Ox® 485 kPa (70 psi) Exhaust Brake; New Spring Compressor Group Available {1108,1109,1119,0702,0703}

1988/12/19 Correct Timing Specification {0374}

1988/12/19 New Piston Body Assemblies Used {1214}

1988/12/19 Do Not Use Heli-Coils® To Repair Rocker Arm Assemblies On 5.4" Bore Engines {1123}

1988/12/26 Check Load Height Before Transporting Machines {7500}