Hardened Washers Now Used Between The Bolt Heads And The Engine Front Support To Keep These Bolts Tight{1153}
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:
1977/02/28 Modification To Holder To Machine Counterbore On Cylinder Block{0664,1201}
1977/02/14 Diesel Fuel Recommendation Expanded{1280}
1977/02/14 Test Used Fuel Nozzles Before You Install New Nozzles; Tips On Test Procedures{1254,0651,0336}
1977/02/14 New 5P7307 Engine Turning Tool Group Fits All Engines{0611}
1977/02/14 Correct Use Of Plugs In Drain Holes Of Hydraulic Pumps That Have Two Seals On The Shaft-Use A Plug In Drain Hole Except With Water Glycol Systems{5055,5073}
1977/01/31 Low Emission Truck Engines With Exhaust Gas Recirculation (EGR) Systems{1050}
1977/01/31 Transportation Notice Plate Is No Longer Needed For Pressurized Nitrogen Cylinders{7557}
1977/01/31 New Remote Control Switch Assembly For Electric Hydraulic Pumps{0621,0623}
1977/01/31 Improved Crankshaft Main Bearing With Higher Strength Aluminum Alloy{1203}
1977/01/31 New Disconnect Switch Assembly Has Better Resistance To Corrosion{1411}
1977/01/24 Lightening Holes Not Drilled In Some Crankshafts{1202}
1977/01/24 New Cylinder Liners{1216}
1977/02/28 Clip Now Used To Hold Coolant Line For The Turbocharger{1052,1380}
1977/02/28 Lock Now Available For Connecting Rod Bolt Used In TU-FL0501 Air Compressor{1065}
1977/02/28 Improved Exhaust Valve Now Available{1105}
1977/02/28 Changes To Retainer Nut Torque And Assembly Procedures For Turbocharger Compressor Wheels{0374,1052}
1977/03/07 Relief Valve Added To Lubrication And Testing Group For Sealed And Lubricated Track{0651,0671,4175}
1977/03/07 Improved Shut-Off Solenoids For Engines Equipped With Sleeve Metering Fuel Systems{1259}
1977/03/07 Drains In New Fuel Injection Pump Housing And Governor Housing Prevent Possible Corrosion And Freezing Damage{1286}
1977/03/07 Use Insert To Repair Bearing Seat In Water Pump Housing{1361}
1977/03/07 Cooling System Orifice Changed For Better Flow Control And Air Removal{1380}
1977/03/21 New Spring Used In Fuel Ratio Control{1278}
1977/04/11 New Retainer And Improved Housing Keep Water Pump Bearing Tight; Repair For Loosened Bearing{1361}
1977/04/11 Improved Mounting For Expansion Tank{1354,1379,1380}