90048-ZY6-010 Honda BOLT, SEALING (20MM) (Honda Code 7923436).

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PSP FOR ENGINE OIL COOLER AND OIL PUMP BYPASS VALVE ON D9L, 651E, 657E TRACTORS; 992C LOADERS AND 773B TRUCKS - MAILED US AND CANADA, CACO, COFA, CFEL, COSA
  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 ENGINE OIL COOLER AND OIL PUMP BYPASS VALVE ON D9L, 651E, 657E TRACTORS; 992C LOADERS AND 773B TRUCKS, 1315, 1350, 1378, PS4048 U-18 A-11 AU-16 C-18 E-15 O-14 See May 3, 1986 See May 25, 1986 This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4048" as Part Number and "7755" as Group Number. There have been some earlier Service Letters on this subject. The May 14, 1982 (SLA122), July 16, 1984 (PI7104) and May 10, 1985, (PI7104) are no longer in effect and reference should be made to this Service Letter. Termination Date
March 31, 1987
Problem
The engine oil cooler on the following products has not provided satisfactory service life. An improved rubber end sheet oil cooler is now used. This uses a stronger adhesive to hold the baffles in place. The improved oil cooler has the same 4W6045 part number, but can be identified by the letter "H" stamped next to the oil cooler part number. An oil cooler with these improvements and a new part number will be available sometime in the future. A new oil pump by-pass valve is also used in production. The new valve is a different design which will prevent pressure pulses. The pressure pulses have been a major contributor to oil cooler failures.
Affected Product
The affected products have been separated into two categories; products which are eligible for the improved oil cooler and products which are eligible for the oil pump improvements. Both categories should be checked for the specific product, because many products are eligible for both improvements. Model Identification Number Improved Oil Cooler D9L 14Y2694, 2879, 2971-2973, 2975-2980, 2984, 2985, 2987-3039, 3041-3310, 3312-3329, 3331-3342, 3345, 3456, 3465-3467 651E 89Z108-135 657E 90Z123, 127-143, 145 91Z213, 215-244, 246-261 773B 63W1-1369, 1370, 1374, 1376, 1379-1411, 1413-1419, 1421-1599, 1601-1608, 1610, 1618 992C 49Z490, 505, 509, 516, 517, 520-525, 527-774, 778-790, 798, 804 Improvements to Oil Pump D9L 14Y2694, 2879, 2971-2973, 2975-2980, 2984, 2985, 2987-3039, 3041-3310, 3312-3319, 3324, 3456, 3465-3467 651E 89Z108-134 657E 90Z123, 127-143 91Z213, 215-244, 246-259, 261 773B 63W1369, 1370, 1374, 1376, 1379-1411, 1413-1419, 1421-1600, 1606, 1608 992C 49Z490, 505, 509, 516, 517, 520-525, 527-753, 755-765 If a 4W6045 Core Assembly was installed on earlier products and rework is necessary, they can be claimed under this program.
Parts Needed
1-4W6045 Core Assembly(H) 1-7C1512 Plunger 2-4F7387 Seal 1-7C1511 Ring 1-5F149 Ring 1-7C1527 Spacer 1-4N864 Gasket 2-5B4274 Bolts 1-4N1151 Gasket 1-1N3246 Retainer 3-6L1651 Seal 1-2S2760 Spring 1-9M7002 Seal 1-7S8767 Gasket
Action Required
If the engine oil cooler has failed, flush the cooling and/or lubrication system as needed. Install the new parts. It is important that the oil pump by-pass valve parts be installed as shown in the illustration. The new valve does not use a guide. (SEE ILLUSTRATION) (SEE ILLUSTRATION)
Parts Disposition
U.S. and Canadian Dealers Return all 1N3246 Retainers removed from 992C Loaders and 773B Trucks to the Pioneer Park Claims Building to the attention of J. Allen. Handle all other parts in accordance with your Warranty Bulletin on warranty parts handling. All Other Dealers Handle all parts in accordance with your Warranty Bulletin on warranty parts handling.