0337494 JOHNSON SCREW, Motor to manifold

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PSP FOR OIL TRANSFER FROM THE TRANSMISSION TO THE ENGINE ON D3B TRACTORS, 910 AND 931 LOADERS - MAILED WORLDWIDE EXCEPT CBS A
  The information supplied in this service letter may not be valid after the termination date of this program.   Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
PRODUCT SUPPORT PROGRAM FOR OIL TRANSFER FROM THE TRANSMISSION TO THE ENGINE ON D3B TRACTORS, 910 AND 931B LOADERS, IT12 TOOLCARRIERS, 1202, PS0300 (Revised March 1987) U-10 A-4 AU-5 E-2 O-9 See February 26, 1987 This Service Letter replaces the January 22, 1987 Service Letter and the Service Letter Supplement February 26, 1987. The changes are denoted by (right arrow). This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS0300" as Part Number and "7755" as Group Number. Termination Date
January 31, 1988
Problem
Transmission oil can transfer past the single lip crankshaft seal into the engine crankcase on some D3B Tractors, 931B and 910 Loaders. This can cause two problems. Excessive oil in the engine results in high oil consumption. Also, low oil level in the transmission can cause low control pressure, resulting in clutch slipping or clutch disengagement. A double lip seal group can be installed. (right arrow)
Affected Product
Model Identification Number D3B 23Y1 - 2290 24Y1 - 2265 27Y1 - 4646 28Y1 - 1886 D3B Custom 75 27Y1 - 4170 28Y1 - 1752 910 40Y1 - 8095 41Y1 - 2831 931B 25Y1 - 1945 26Y1 - 521 29Y1 - 2213 30Y1 - 484 931B Custom 75 29Y1 - 2020 30Y1 - 470 IT12 2YC1 - 913 4NC1 - 932
Parts Needed
1 - 7W3202 Rear Seal Group
Action Required
1. Remove the engine and flywheel per Service Manual. 2. Inspect the oil scavenge return port inside of the flywheel housing as shown in Illustration 1. Look for a cast ridge under this hole. See Illustration. Remove the ridge if present. This will allow any oil thrown by the flywheel to flow without restriction into the return port and back to the transmission. Note: Protect the seal area from grinding dust, and clean the housing thoroughly after grinding. ustration 1. (SEE ILLUSTRATION) 3. Replace the rear crankshaft seal and wear sleeve with the proper tooling according to the procedure in Special Instruction SMHS7100-02. The following tools are needed to install the 7W3202 seal group: 1-8T3098 Installer 2-1P5515 Bolt 1-5P290 Locator 1-9S8858 Nut 4. Install the flywheel and engine per Service Manual. WARRANTY ALLOWANCES (SEE ILLUSTRATION) This is a 16 hour job and includes removal and installation of the engine.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.