1983/12/19 Caterpillar

Smaller Dowel, Stronger Cover Used On Oil Pump Drive Shaft{3310}

Usage:

7231, 7241 Marine Transmissions

Description of Change: A smaller dowel and a stronger cover are used in the oil pump drive shaft on 7231 and 7241 Marine Transmissions. Reports show that some of the former covers could crack.

Adaptable As: The new 4F2609 Dowels are a direct replacement for the former 4F2099 Pins when used with the new 1N9274 Cover. The part number of the cover did not change. Use of the new dowels and cover are in effect on 7231 Marine Transmissions (17W777) and 7241 Marine Transmissions (39E522).

To install the new cover on an existing shaft assembly, use the procedure that follows:

1. Install the new cover on the shaft. Make sure the holes in the cover are turned 90° from the holes that are in the shaft. Use the cover as a template to drill two 5.8 mm (.228") holes. Drill these holes to a depth of 13.97 mm (.550").

2. With the cover still in position against the shaft, use a reamer to increase the diameter of the holes in the cover and shaft to 6.165 ± 0.013 mm (.2427 ± .0005"). Ream these holes to a minimum depth of 12.7 mm (.50").

3. Install a 4F2609 Dowel in each hole to hold the cover in position.

Location of new parts.

Caterpillar Information System:

1983/12/12 Modification Of Control Panel Gives Different Power Source For Overcrank Timer To Prevent Starter Motor Failures{7450}

1983/12/12 Cooling System Conditioner Helps Prevent Cavitation Damage{1350}

1983/12/12 Dry Exhaust Elbow and Improved Turbocharger Exhaust Seal Help Prevent Exhaust Gas Leakage{1052,1061}

1983/12/12 New Spring And Shaft Used In Governor Control Lever Have Increased Corrosion Resistance{1265}

1983/12/05 Inspect Camshaft And Lifters After A Failure In The Valve Mechanism Area{1209,1208,1210}

1983/12/05 6V4163 Bit And 6V4164 Driver Now Available For Removal Of Bolts For Flyweight Carrier{0612,1264}

1983/12/05 Mixture Of Inch And Metric Fasteners To Be Used{0683}

1983/12/05 Several Temperature Detectors Available For 6V6996 And 6V7118 Induction Bearing Heaters{0627}

1983/11/21 Crankshaft Positions For Injector Timing And Valve Clearance Settings{0374,1104,1290}

1983/11/21 Service Information For Balancers And Dampers{1205}

1983/11/21 Recommendations For Use Of Different Types Of Friction Discs In A Transmission{3155}

1983/11/21 Correct Installation Of New Valve Springs{1108}

1983/12/19 Replacement Valve Guides Can Be Used To Recondition Cylinder Heads{1104}

1983/12/19 New Monitor Groups Will Keep Water Out Of EMS Panel{7490}

1983/12/19 FT1808 Cable Permits Easier Use Of 6V2100 Multitach To Check Engine Or Alternator RPM{0651}

1984/01/09 Reference Chart For Usage Of New Electronic Components{7400,0374}

1984/01/09 Water Pump Housing Is Now Available For Parts Service{1373}

1984/01/09 Stronger Water Cooled Exhaust Manifold Used{1059}

1984/01/09 Usage Of Pistons With Rectangular Rings{1214,1215}

1984/01/09 High Levels Of Soot In The Oil; Make Sure Air Fuel Ratio Control Operates Correctly{1278}

1984/01/09 Parts Service Information For Pistons{1214,1225}

1984/01/09 Drive Block Retainer Plates Are No Longer Used{3305}

1984/01/16 New Cover And Lever Will Prevent Overtravel Of Valve Spool {3313}

1984/01/23 New Plastic Impeller Will Help Improve Service Life Of Water Pump Seal{1361}