1977/04/18 Caterpillar

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

Usage:

D342, D343 Engines in All Applications;
1693 Truck Engines;
G342, G343 Gas Engines

Description of Change: A new front seal and wear sleeve are used in crankshaft groups for the above engines. This permits repair of worn surfaces for maximum seal efficiency, without installation of a new crankshaft. To give the necessary clearance for the wear sleeve, the opening for the crankshaft in 9L6017 and 9S745 Front Covers (Cylinder Block) now has a larger bore diameter.

Adaptable To: The new 9N2539 Seal and 9J110 Wear Sleeve can be installed in place of the former 2S1509 Seal in all earlier engines. The new seal and sleeve are available in a 7N142 Seal Group (Crankshaft Front) for service replacement. On engines equipped with the 9L6017 or 9S745 Cylinder Block Front Cover, it will be necessary to either install a later front cover or machine the opening for the crankshaft in the existing cover to a diameter of 4.400" ± .010" (111.76 ± 0.25 mm). The part numbers of the 9L6017 and 9S745 Front Covers are not changed, but identification of the later covers can be made by measurement of the crankshaft hole diameter. The former diameter was 3.740" ± .010" (95.00 ± 0.25 mm).

INSTALLATION: Complete instructions for installation of the crankshaft seal and wear sleeve are given in Special Instructions Form SMHS6959.

Caterpillar Information System:

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

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

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 Improved Mounting For Expansion Tank{1354,1379,1380}

1977/04/11 New Retainer And Improved Housing Keep Water Pump Bearing Tight; Repair For Loosened Bearing{1361}

1977/03/21 New Spring Used In Fuel Ratio Control{1278}

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}

1977/04/18 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}

1977/04/25 Improved 5P3000 Engine And Transmission Shipping Stand Assembly; Modification Available For Stands Already In Use{0640}

1977/04/25 Revision Of Engine Data Sheet Gives Important Information On Single-Bearing Generators Assembled To Cat Engines{1156,4450,0354}

1977/04/25 New Socket Assembly To Tighten The Bolts That Fasten The Sleeve Levers To The Sleeve Shaft{0621,1250}

1977/05/02 Improved Cylinder Block With Spacer Plate Used With New Cylinder Heads, Cylinder Head Gaskets, Cylinder Liners And Timing Gear Housing{1101,1162,1201,1216}

1977/05/02 Improved Keystone Piston Assembly{1214,1216}

1977/05/02 Special Tools For Complete Repair Of Water Pump In Direct Injection Engines{0620,1361}