1977/03/07 Caterpillar

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

Usage:

3208, 3304 and 3306 Engines in All Applications

Description of Change: Electric shut-off solenoids with a single (one) coil design are now used on the above engines. The former solenoids were dual (two) coil design with contacts to disconnect the pull-in coil when the solenoid plunger was in the energized (activated) position. Corrosion of these contacts can cause the pull-in coil to be activated at all times. The result was possible overheating of the pull-in coil and failure of the solenoid. Electric shut-off solenoids with a single coil design do not have contacts or the problems of corrosion and failures caused by corrosion.

Adaptable As: The new solenoids are direct replacements for the former solenoids with dual coil design, except for engines equipped with Woodward governors. The new solenoids can not be installed on engines equipped with Woodward governors. Some of the dual coil solenoids are still available for parts replacement on these engines.

INSTALLATION: Electric shut-off solenoids for 3208 Engines are put in the energized to run position only. On 3304 and 3306 Engines, solenoids can be either energized to run or energized to shut-off, according to which shut-off group the engine is equipped with.

Caterpillar Information System:

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}

1977/02/14 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}

1977/03/07 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}

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}