0307582 JOHNSON SCREW

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PSP FOR TIMING ADVANCE RACE WEAR AND RETAINING RING LOSS ON CERTAIN 3406B TRUCK ENGINES - PS4300 - MAILED US AND CANADA, CAC O, COFA, CFEL, TRUCK TEPS, LIMITED 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-106 A-77 AU-72 E-50 O-69.1 TT-5 1250, 1272 PS4300 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 "PS4300" as Part Number, "7755" as Group Number, and "96" as Description Code. Termination Date
May 31, 1990
Problem
The timing advance race and spool may wear, and cause retaining ring loss on certain 3406B Truck Engines.
Affected Product
Model Identification Number 3406B 4MG03600-57673
Parts Needed
4 - 7N7264 Weight - Governor 1 - 4W7751 Weight - Carrier 1 - 093101 Retaining Clip (Ring) 4 - 1S5440 Dowel 1 - 4W7752 Spool 2 - 7E2460 Race 4 - 8C9034 Bolt 1 - 2W0459 Gasket 1 - 8L5832 Nut 2 - 9Y7450 Retainer 2 - 4W2754 Seal (use if required) 1 - 4W0436 Seal (use if required) 1 - 7C7971 Cover (use if required) 4 - 6V7698 Bolt (use if required) 4 - 1B4427 Nut (use if required)
Action Required
Pin the injection pump camshaft. Remove the outer cover and the governor drive group from the engine. Remove the 7W1527 Retainer (inside cone) to expose the flyweights and carrier. Install the new parts listed under Parts Needed. Make sure the 7E2460 Race(s) are installed with the flat sides against the retaining ring on the spool. See Illustration 1. During assembly it is helpful to install the first three flyweights and one 9Y7450 Retainer. See Illustration 2. Insert the first race (sleeve down), installing retaining ring securely in spool, and then add the final flyweight, dowel, and retainer. Tighten the four 8C9034 Bolts to 3.4 +/- 0.4 N.m (31 +/- 4 lb in). Finally, slip the second 7E2460 Race on the spool (sleeve up). Be sure the flyweight carrier/body assembly is fully retracted in drive group. Install spring and inside retainer. Pre-set advance START and STOP adjustments. This may be done with the drive group on or off the engine. Loosen the 3K3467 Nut, and turn the 7W7663 Screw counterclockwise (CCW) 1 1/6 turns. Tighten the nut to 70 +/- 15 N.m (50 +/- 11 lb ft). While holding the 5H6552 Setscrew, remove the 4B2049 Nut. Turn the 5H6552 Setscrew clockwise (CW) 1 5/6 turns. Carefully install the 8L5832 Nut without turning the setscrew. Tighten the nut to 4.5 +/- 0.5 N.m (39 +/- 4 lb in). Install a 3/8"-16 NC x 5 1/2" long guide bolt in the fuel pump guide ring. A 5F4899 Bolt with the head removed will work. Install the governor drive group with large bolts. Remove the guide bolt. Install the outer cover with a new 2W0459 Gasket. Remove the pin from the injection pump and replace the plug. Check the dynamic timing of the engine using a 6V3100 or 8T5300 Timing Indicator Group. Stamp "PS4300" on upper right rear corner of cylinder block.
Service Claim Allowances
Product Caterpillar Dealer Suggested Customer Suggested miles Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. (C/L) (Sell) (C/L) (Sell) 0-200,000 100% 3.2 0 0 0 0 200,000 - 50% 1.6 0 0 50% 1.6 300,000 This is a 3.2-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling. ****** IMAGE: SEBE4053.00001.001 CAPTION: Illustration 1 ****** IMAGE: SEBE4053.00001.002 CAPTION: Illustration 2 ****** IMAGE: SEBE4053.00001.003 CAPTION: Illustration 3