1977/03/21 Caterpillar

New Spring Used In Fuel Ratio Control{1278}

Usage:

All 5.4"
Bore, and Six Cylinder 6.25"
Bore Engines in All Applications

Description of Change: A new spring is used in the fuel ratio control on the above models. The new spring has both ends machined, so they are flat and exactly at right angles to the centerline of the spring. This will keep the spring and other parts in better alignment during operation, with less side force on the diaphragm and servo valves. The result is smoother operation of the control.

Adaptable As: Direct replacement. Two different springs are used in the basic fuel ratio control groups for different models and applications, but each spring is a direct replacement for the former spring which is canceled. For identification, two paint stripes are used on the new springs in comparison with the single stripe on the former springs. The color of the paint stripes is not changed.

Caterpillar Information System:

1977/03/07 Cooling System Orifice Changed For Better Flow Control And Air Removal{1380}

1977/03/07 Use Insert To Repair Bearing Seat In Water Pump Housing{1361}

1977/03/07 Drains In New Fuel Injection Pump Housing And Governor Housing Prevent Possible Corrosion And Freezing Damage{1286}

1977/03/07 Improved Shut-Off Solenoids For Engines Equipped With Sleeve Metering Fuel Systems{1259}

1977/03/07 Relief Valve Added To Lubrication And Testing Group For Sealed And Lubricated Track{0651,0671,4175}

1977/02/28 Changes To Retainer Nut Torque And Assembly Procedures For Turbocharger Compressor Wheels{0374,1052}

1977/02/28 Improved Exhaust Valve Now Available{1105}

1977/02/28 Lock Now Available For Connecting Rod Bolt Used In TU-FL0501 Air Compressor{1065}

1977/02/28 Clip Now Used To Hold Coolant Line For The Turbocharger{1052,1380}

1977/02/28 Hardened Washers Now Used Between The Bolt Heads And The Engine Front Support To Keep These Bolts Tight{1153}

1977/02/28 Modification To Holder To Machine Counterbore On Cylinder Block{0664,1201}

1977/02/14 Diesel Fuel Recommendation Expanded{1280}

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}

1977/04/11 New Shaft Assemblies Used For Forward And Reverse Clutch And Stronger Nipple Used At Oil Pump{3302,3306,3307,3310,3314}

1977/04/11 New Diaphragm Used In Brakesaver Control Valve{1159}

1977/04/18 Tools To Remove Wear Sleeves From Crankshafts{0621,7558}

1977/04/18 New Crankshaft Front Seal And Wear Sleeve Permit Crankshafts With Seal Wear To Be Used Again{1151,1160}

1977/04/18 Stronger Material Used In Undersize Connecting Rod Bearings{1219}

1977/04/18 Gasket For Water Temperature Regulator Now Has Larger Vent Passage{1355,7555}

1977/04/18 Guide Assembly For Dipstick (Oil Level Gauge) Now Has Thicker Walls{1300}

1977/04/25 Alternator Groups With Slower Drive RPM Used Again{1205,1405}

1977/04/25 New Piston Pin Bearing Used In Connecting Rod Assembly{1218}

1977/04/25 New Oversize Connecting Rod Bearings Have Improved Design And Material{1219}