1987/03/30 Caterpillar

Oversize Piston Ring Seal Available For Clutch Group {3302,3300}

Usage:

3192 And 7251 (74E ) Marine Transmissions

Description of Change: An oversize piston ring seal is available to service the clutch group used in 7251 (74E) Marine Transmissions. Use of the oversize seal rings allows a worn clutch cylinder assembly to be salvaged. Illustration 1 shows the location of the oversize ring seal.

Adaptable To: The 7T5433 Ring [0.76 mm (.030") oversize] is adaptable to the 4L4320 Clutch Group used in the 3192 and 7251 Marine Transmissions 74E1 through 74E2299.

The 7T5433 Ring (oversize) can be installed in place of the 3D146 Ring (standard) when the 4L4343 Cylinder Assembly is bored to the dimensions shown in Illustration 2. The cylinder assembly may be bored a lesser amount, provided the 7T5433 Ring gap is adjusted to 0.38 mm (.015") when the ring is fitted in the bore of the 4L4343 Cylinder Assembly.

Illustration 1. Location of the 7T5433 Ring (oversize).

Illustration 2. Dimensions to machine the 4L4343 Cylinder Assembly to work with the 7T5433 Ring (oversize).

Caterpillar Information System:

1987/03/30 Salvage Of Cylinder Heads By Using Oversized Valve Guides And Valve Inserts {1104,1103}

1987/03/30 New Washer Used In Fuel Transfer Pump Group {1256}

1987/03/30 Oversize Bearings For Turbocharger Center Housings Available {1053,1052}

1987/03/30 Piston Cooling Jets No Longer Used In Some Applications {1200}

1987/03/30 New Service Tools Available {0600}

1987/03/23 New Clamps And Grommets For Turbocharger Oil Lines{1300,1307,1052}

1987/03/23 Gasket Removed From Flywheel Housing Cover Groups{1157}

1987/03/23 Improved Fuel Transfer Pump Cover; Weep Hole Moved{1255}

1987/03/23 Pleasure Craft Cruise Kits Available{1000}

1987/03/23 Some Components Of The Transmission Mounting Group For Allison AT540 And AT545 Transmissions Are No Longer Serviced By Caterpillar{3279,1013,3009}

1987/03/23 Identification Of External Terminals On Alternators{1405,1406,1400}

1987/03/23 Dispenser Available For Shop Towels{0600}

1987/04/06 Stop Engine If There Is A Turbocharger Bearing Failure{1052,1318}

1987/04/06 Improved Governor Performance{1264,1250}

1987/04/06 Engine Identification Plate Information For 3406B (PEEC) Truck Engines{0782,1250}

1987/04/06 Rerate Plates And 4W5140 Engine Information Plate Available For Use When Rerating 3406B (PEEC) Truck Engines{0782,1250}

1987/04/06 New Idler Shaft And Sealing Washers Used In Front Gears And Accessory Drives{1206,1207}

1987/04/06 Longer Bolts With Spacers Now Used On Exhaust Manifolds{1059}

1987/04/13 Checking Injector Synchronization On Engines Equipped With New 11.0 mm Injectors{1290}

1987/04/13 Initial Start Of Engine Using An EGB29P Governor/Actuator After Filling With Oil{1264}

1987/04/20 New Pipe Used Between Turbocharger And Aftercooler; Improved Turbocharger Compressor Housing Has Two Retaining Bolt Holes{1050,1061,1079}

1987/04/20 Serviceable Parts For New Fuel Ratio Control; Pressurize Control To Set Rack On 3406B Engines In Driltech Drill Rigs{1257,1258,1264}

1987/04/20 Material Changed In Exhaust and Inlet Valves{1105}

1987/04/20 Fuel Injection Timing Adjustment{1250}