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 New Solenoid Valve For Rotor Lift System{8245}

1988/12/12 New Switch For Back-Up Alarm{7406}

1988/12/12 Parts Needed If Air Compressor Tubes Replaced{4257,1803}

1988/12/12 New Operator Monitor Group Used{7490}

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

1988/12/05 Operation Of Feeder Sensor Control{8216}

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

1988/12/05 Hydraulic Pressure Settings For Backhoe Loaders{5050,5450}

1988/12/05 Improved Coupler Pin Helps Prevent Cylinder Rod Bending{6129}

1988/12/05 New Air Tank Drain Valve Used{4250,4272}

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

1988/11/28 Stronger, Longer Ring Gear Retainers For Final Drives {4054,4084}

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}

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

1988/12/19 Cold Weather Readiness Checks {1456,1250}

1988/12/19 New Circle Drive Gerotor Motor Groups Provide Higher Torque To Circle Drive {5082}

1988/12/19 New Brake Disc Assemblies, Axle Lubricant Reduce Brake Chatter {3278,4255}

1988/12/19 Stronger Spacers Can Be Used On Stabilizer Street Pads {6505}

1988/12/19 New Latch Used For Engine Side Doors {7263}

1988/12/19 New Axle Differential Group Used {3258}

1988/12/19 New Detent Group Available For Hoist Control Valve {5051}

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