1980/05/19 Caterpillar

Turbine Wheel Shroud Design Changed; Snap Ring No Longer Used{1052}

Usage:

All Caterpillar Engines Equipped With Schwitzer Model F Turbochargers

Description of Change: The design of the turbine wheel shroud has been changed for the Schwitzer Model F Turbochargers. Also, the snap ring which held the earlier design turbine wheel shroud in place, has been removed.

New and former designs of 4N9556 Turbine Wheel Shrouds.

The new shroud permits the clamp force of the turbine housing to the center housing to hold the shroud in position. The snap ring is not necessary with the new design shroud.

Adaptable As: The new 4N9556 Turbine Wheel Shroud is a direct replacement for the earlier 4N9556 Turbine Wheel Shroud and the 4M6990 Snap Ring. The snap ring can not be used with the later shroud, but must be used with the earlier shroud.

Location of 4N9556 Turbine Wheel Shroud and 4M6990 Snap Ring.

Caterpillar Information System:

1980/05/19 Important: 7V2253 Anti-Creep Slides Must Be Correctly Installed, And Adjusted With The Seat Belt{7327}

1980/05/12 Changes To Oil Level Gauge Group Improve Accuracy Of Oil Level Indications, Increase Oil Capacity Of 245 Excavators And Front Shovels{1300}

1980/05/12 Bushing Bores In Boom Can Be Machined In The Field{6501,0664}

1980/05/12 Possible Cause Of A Low Idle Misfire And/Or Backfire{1278,1076,1250}

1980/05/12 New Part Available To Check The 3S1467 Plunger And Barrel Assemblies{1251,1252,0652}

1980/05/12 Boss Can Be Removed From Spacer Plate Cylinder Block To Get Clearance For Oil Filler Tube{1201,1316}

1980/05/12 "I checked everything but..."{0100}

1980/05/12 Improvements To Engine Oil Lines Group Makes Installation Easier; Prevents Reverse Connections{1307,1318,1155}

1980/05/12 Use The FT1525 Alignment Pin And FT1526 Fixture When Reconditioning Earlier 3208 Sleeve Metering Fuel Systems{0626,1264,1286}

1980/05/05 Hardened Washers Now Used On Bolts For Fan Shroud{1353,1360}

1980/05/05 Improvements Made To Water Separator Groups{1263}

1980/05/05 Changes To 9S240 Rack Position Tool Group; Revision To Special Instructions{0653,0374,1250}

1980/05/19 "Viscor Cup" Available To Check SAE J967 Calibration Fluid For Fuel Injection Test Bench{0651}

1980/05/19 New Plug With Straight-Threads Used In Engine Variable Timing Drive{1272}

1980/05/26 6V97 Engine Stand Is Available{0626}

1980/05/26 New Check Valve Used In Fuel Injection Pump Assembly{1251}

1980/05/26 Four Fabricated Tools Available To Adjust Carrier Bearing Preload And Backlash (Tooth Clearance) For Bevel Gear And Pinion{0611,3258,3256,3257}

1980/05/26 6V6 Electrical Connector Pliers Available{0613}

1980/06/02 Improved Procedure Can Be Used To Adjust Voltage Gain{4467}

1980/06/02 Reverse Flow Check Assembly Now Used In Fuel Injection Pump Assemblies{1251,1272,1254}

1980/06/02 Oil Pump Drive Sleeves Now Available Separately For Parts Service{3300}

1980/06/02 New Cylinder Sleeve Is Available For Repairs Of Worn And/Or Damaged Cylinders{1216,1201}

1980/06/09 6V2050 Tapered Rod Tool Group Available For Removal And Installation Of Bearings{1219,1218,1214}

1980/06/09 Check For Short Circuit In Rotor Field Windings If Low AC (Alternating Current) Voltage Is A Problem{4455,4457}