WASHER 2N7228 - Caterpillar

REBE8166-00
04Apr2012
U-187
A-154
D-163
O-177
Parts stock action only
PRODUCT IMPROVEMENT PROGRAM FOR REMOVING CERTAIN CYLINDER PACK ASSEMBLIES OR INSPECTING AND POSSIBLY REWORKING PISTON PIN RETAINERS ON CERTAIN CYLINDER PACK ASSEMBLIES IN DEALER PARTS STOCK
7750 PI70431
When submitting claim for Parts Stock Action, Use the appropriate 99Z as the s/n, the appropriate Service Letter Program Number as the Part number in the Part Causing Failure field, "7751" as the Group Number, "56" as the Description Code.
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.
TERMINATION DATE
31Jul2012
PROBLEM
Certain Remanufactured cylinder packs for 3500 and D-Series Engines may have mis-assembled 7M-4926, 8N-7296, or 253-1238 Piston Pin Retainers. The piston pin retainers may not have been seated properly. A missing or improperly seated piston pin retainer could result in engine damage.
ACTION REQUIRED
The suspect cylinder pack part numbers are as follows:
0R-3037
0R-3285
0R-3286
0R-3296
0R-3756
0R-3841
0R-4283
0R-4446
0R-4447
0R-4449
0R-4450
0R-4452
0R-7700
10R-4029
10R-4343
10R-4378
10R-4471
10R-5992
10R-5993
10R-8761
10R-8762
10R-9224
10R-9257
10R-9258
10R-9264
10R-9267
20R-0582
20R-0618
All packaging labels of the part numbers listed above require inspection.
Refer to Image1. If the date code on the packaging label is before D01M03Y12P68HL (March, 1. 2012) then the following options are available:
Inspect only cylinder packs with a date code label having "P68HL" following the date code.
Option 1
1. If the date code on the packaging label is before D01M03Y12P68HL (March, 1. 2012), return the cylinder packs, with the suspect date codes, that will not be used within 3 months.
Option 2
1. Inspect the affected cylinder packs in dealer parts stock.
2. Inspect the date code on the package label to determine if any of the affected cylinder packs have date codes before D01M03Y12P68HL (March, 1. 2012).
If the packaging date code IS NOT before D01M03Y12P68HL, then mark the box to indicate that the cylinder pack has been inspected according to this program (PI7####) and return the cylinder pack to dealer parts stock.
If the date code IS before D01M03Y12P68HL, then inspection of the cylinder pack is necessary.
3. For monotherm pistons, the use of a borescope can be employed in order to view each end of the pin.
4. If borescope is not available, then slide the piston and connecting rod toward the bottom of the cylinder liner. Slide the piston and connecting rod far enough to allow inspection of the piston pin retainers.
Do not slide the piston far enough to expose the piston rings.
5. Inspect both piston pin retainers to insure they are properly seated in the groove. Refer to Image2 for properly installed retainer.
6. If both the piston pin retainers are properly seated, reassemble and repackage the cylinder pack, mark the package to indicate the cylinder pack has been inspected according to PI7#### /