1978/04/17 Caterpillar

Improved Oil Suction Tube Assembly {3300,3302}

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.

Suction tube in 7261 Marine Transmission.

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

Caterpillar Information System:

1978/04/17 Locating Bushings For The 5P3550 Rod Boring Machine Will Now Hold Tapered Piston Pin Bushings {0626}

1978/04/17 Improved Yokes, Hardened Washers And More Torque Keep Valve Lifter Guides Tight {1209}

1978/04/10 New Lifting Eye Group Used On 3412 Industrial Engines Equipped With Turbochargers{1101,1000}

1978/04/10 New 5P9693 Reusable Cable Tie For Storage Of Wires, Cables And Tubing{0630}

1978/04/10 New Piston Group With Better Service And Operation Characteristics Now Available{1214}

1978/04/03 A Gasket Group Is Available To Give Improved Sealing For The Oil Supply To The Rocker Arms On Early Engines{1101,1102,1221}

1978/04/03 Procedure For Alignment Of Transmission Mounting Parts On 1100 Series And 3208 Truck Engines With Allison MT640, MT650, And AT540 Series Transmissions{3000,1156,1157}

1978/03/27 Correct Adjustment Of The Governor Control Linkage In Truck Engines Is Necessary To Prevent Low Power{1265,1269}

1978/03/27 More Torque Now Used To Tighten The Retainer Nut For Turbocharger Compressor{1052,1053}

1978/03/27 5P4149 Conversion Group To Become A Discontinued Item On October 1, 1978{0650,1254}

1978/03/27 How To Find Correct Oil Change Intervals For Truck Engines Operated In Short Distance Applications (Pick Up And Delivery Service){1318,7500,0374}

1978/03/27 9N3700 Or 9N3299 Nozzle Assemblies Must Be Used On 3208 Engines That Are Equipped With Exhaust Gas Recirculation (EGR){1254}

1978/04/24 Use 6V100 Tool Arrangement To Remove And Install Piston Pin Bearings For Both Tapered And Standard Connecting Rods{0620,1218}

1978/04/24 Do Not Use The 5B1401 Cleaning Tool Group To Clean The Orifice In Capsule-Type Fuel Injection Nozzles{0650,1254}

1978/04/24 Oil Grooves And Harder Gears Are Now Used In The Oil Pumps On 6.25" Bore Vee Engines{1304}

1978/04/24 Cylinder Block Has New Cover With An Oil Return Connection For Rockford Fan Drive{1201}

1978/04/24 Improved Water Separator Element And Retaining Clamp Stops Fuel Leakage{1250}

1978/04/24 New Oil Pressure Gauge Available For Marine Transmissions Used On D348, D349, D353, D379, D398, D399, 3406 And 3408 Marine Engines{7457,3300}

1978/05/01 5P8719 Hydraulic Hand Pump Decreases The Time Needed To Move Ram Pistons Under No Load{0621}

1978/05/01 New 5P8709 Piston Tool Group For The Alignment Of Piston Cooling Jets{0650}

1978/05/01 Correct Installation Of Lip-Type Seals In Hydraulic Oil Pumps{5055,5073}

1978/05/01 O-Ring Seals Of A Different Material Are Now Used On The Outside Diameter Of The Servo Cylinder In Governors{1264}

1978/05/01 External (Outside) Oil Lines Now Used Instead Of The Oil Passage In The Cylinder Block And Flywheel Housing{1307}

1978/05/01 Double-Walled Fuel Injection Lines Protect Unattended Industrial And Marine Engines{1252,0353}