37521-ZY6-000 Honda PLUG, TDC HOLE (Honda Code 7635212).

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PSP FOR INSTALLING CHECK VALVE IN THE FUEL FILTER BASE ASSEMBLY ON CERTAIN 3204 ENGINES - PS4291 - MAILED US AND CAN ADA, 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.
U-16 A-12 AU-13 E-11 O-12 1262, 1258 PS4291 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 "PS4291" as Part Number, "7755" as Group Number, and "96" as Description Code. Termination Date
January 31, 1990
Problem
A check valve may need to be installed in the fuel filter base assembly on certain 3204 Engines for the fuel priming pump to operate properly.
Affected Product
Model Identification Number D3B 23Y2583 - 2587 24Y2480 - 2509 27Y5171 - 5174 28Y2058 - 2074 5MC318 - 329 3YC325 - 327 D3C 3RF226 - 371 6PF166 - 190 5KG470 - 705 1PJ184 - 244 8BF1 - 149 7JF137 - 163 D4C 1RJ313 - 511 2CJ143 - 170 D4H 2AC555 - 578 3AC595 - 633 8PB2601 - 2932 9DB1176 - 1324 IT12 2YC1226 - 1319 4NC1342 - 1497 910 40Y8987 - 9268 41Y2992 - 3053 931C 7HF43 - 60 8AF23 - 24 2BJ53 - 139 6RF33 - 59 5LG1 - 30 935C 8CF133 - 241
Parts Needed
1 - 4N3296 Spring 1 - 4N3297 Disk 1 - 4N3298 Seat
Action Required
Install the spring, disk, and seat in the 4N3295 Base Assembly. See the Illustration. Stake (burr) the seat in three places. ****** IMAGE: SEBE3961.00001.001 CAPTION:
Service Claim Allowances
Product Caterpillar Dealer Suggested Customer Suggested smu Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. (D/N) (Cost) (C/L) (Sell) 0-2000 100% 1 0 .5 0 0 2001-4000 33 1/3% .5 0 .5 50% .5 This is a 1.5-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.