Hardened Washers Now Used Between The Bolt Heads And The Engine Front Support To Keep These Bolts Tight
Usage:
3304 and 3306 Engines in All Applications
Description of Change: The front support on most engines is held to the front cover by bolts. During normal operation of the engine, the heads of these bolts can cause wear to the surface of the front support. Because of this wear the bolts can become loose. To prevent this condition, hardened washers are now used between the bolt heads and the front support. Because of the added thickness of the washer, longer bolts are used for compensation.
Adaptable To: All earlier 3304 and 3306 Engines as shown in the chart that follows:
Caterpillar Information System:
1977/03/15 Changes To Retainer Nut Torque And Assembly Procedures For Turbocharger Compressor Wheels
1977/03/15 Clip Now Used To Hold Coolant Line For The Turbocharger
1977/03/15 Lock Now Available For Connecting Rod Bolt Used In TU-FL0501 Air Compressor
1977/02/28 Improved Shut-Off Solenoids For Engines Equipped With Sleeve Metering Fuel Systems
1977/02/28 List Of Service Publications
1977/02/28 Exhaust Manifold Coupling With A Slip Fit Now Used Instead Of A Coupling With Piston Rings
1977/02/28 Drain All Coolant From Engines Before Shipment For Remanufacturing
1977/02/28 Diesel Fuel Recommendation Expanded
1977/02/28 New 5P7307 Engine Turning Tool Group Fits All Engines
1977/01/28 Improved Crankshaft Main Bearing With Higher Strength Aluminum Alloy
1977/01/28 Low Emission Truck Engines With Exhaust Gas Recirculation (EGR) Systems
1977/01/28 Improved Main And Connecting Rod Bearings Have Aluminum Alloy With More Strength
1977/03/15 Improved Exhaust Valve Now Available
1977/03/15 Modification To Holder To Machine Counterbore On Cylinder Block
1977/03/15 Drains In New Fuel Injection Pump Housing And Governor Housing Prevent Possible Corrosion And Freezing Damage
1977/03/15 New Spring Used In Fuel Ratio Control
1977/03/15 Cooling System Orifice Changed For Better Flow Control And Air Removal
1977/04/06 Loose Bolts And/Or Bracket Can Cause Air Compressor Failures
1977/04/06 New Retainer And Improved Housing Keep Water Pump Bearing Tight; Repair For Loosened Bearing
1977/04/06 New Shaft Assemblies Used For Forward And Reverse Clutch And Stronger Nipple Used At Oil Pump
1977/04/06 Use Insert To Repair Bearing Seat In Water Pump Housing
1977/04/06 Coolant Flow Warning System Can Be Adapted To Many Earlier Models
1977/04/06 Revision Of Engine Data Sheet Gives Important Information On Single-Bearing Generators Assembled To Cat Engines
1977/04/06 New Diaphragm Used In Brakesaver Control Valve