1978/05/03 Caterpillar

Improved Oil Suction Tube Assembly

Usage:

7251, 7261 Marine Transmissions

Description of Change: An improved oil suction tube assembly with two O-ring seals is now used on 7251 and 7261 Marine Transmissions. The use of two seals will prevent air leaks between the suction tube and the housing assembly. The former tube assembly with only one seal sometimes had an air leak at this location. Air in the oil can cause high temperatures in the oil and reverse clutch. Also, additional spacers have been added at the tube assembly mounting brackets so the tube can be put in the correct alignment with the bore in the housing assembly.

Adaptable To: The new parts, used together, are adaptable to 7251 Marine Transmissions with Serial Numbers 74E1461-up and to all 7261 Marine Transmissions.

Suction tube in 7261 Marine Transmission.

Caterpillar Information System:

1978/05/03 O-Ring Seals Of A Different Material Are Now Used On The Outside Diameter Of The Servo Cylinder In Governors

1978/05/03 Longer Hoses Used At Radiator Lower Hose Connections

1978/05/03 New 5P7335 Rack Adjusting Tool Available

1978/05/03 List Of Service Publications

1978/05/03 Oil Grooves And Harder Gears Are Now Used In The Oil Pump On 6.25" Bore Vee Engines

1978/05/03 Procedure For Alignment Of Transmission Mounting Parts On 1100 Series And 3208 Truck Engines With Allison MT640, MT650, And AT540 Series Transmissions

1978/05/03 Timing Dimension For Fuel Injection Pumps Changed; 1P7410 Timing Plates Have More Exact Degree Marks

1978/05/03 Do Not Use The 5B1401 Cleaning Tool Group To Clean The Orifice In Capsule-Type Fuel Injection Nozzles

1978/05/03 New Type Seal Used On Water Separator Elements

1978/05/03 Double-Walled Fuel Injection Lines Protect Unattended Industrial And Marine Engines

1978/05/03 Stronger Weights And Gear Used In Automatic Timing Advance

1978/05/03 Shorter Hoses Now Used For The Actuator Control Valve In The Exhaust Gas Recirculation System

1978/05/03 New 5P8709 Piston Tool Group For The Alignment Of Piston Cooling Jets

1978/05/03 One-Piece Seat Used For Governor Spring

1978/05/03 Possible Problems With Fuel Filters

1978/05/03 External (Outside) Oil Lines Now Used Instead Of The Oil Passage In The Cylinder Block And Flywheel Housing

1978/05/03 New Oil Pressure Gauge Available For Marine Transmissions Used On D348, D349, D353, D379, D398, D399, 3406 And 3408 Marine Engines

1978/05/03 New Piston Group With Better Service And Operation Characteristics Now Available

1978/05/03 Chamfer Added To Bolt Hole In Auxiliary Drive Pulley For Water Pump

1978/05/24 Stronger Fuel Inlet Flanges Prevent Parts Damage And Keeps Air Out Of The Fuel System

1978/05/24 Use New Tools To Adapt Former Cylinder Heads With Counterbores To Cylinder Blocks With Spacer Plates

1978/05/24 New Drive Belt Idler Pulleys Have Larger Bearings

1978/05/24 Coolant Syringe And Battery Fluid Probe Now Available

1978/05/24 New Gasket Installed Between Flywheel Housing And Cylinder Block