91301-ZY6-003 Honda O-RING (76.4X3.1) (Honda Code 7636467).

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.
This Program must be administered as soon as possible. When reporting the repair, use "PI3143" as the Part Number, "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description Code. Exception: If the repair is done after failure, use "PI3143" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
Although this Program is to be administered as described above on the Affected Product, parts should be removed from Parts Stock as soon as possible.
This Revised Service Letter replaces the August 15, 1998 Service Letter. Changes have been made to the Affected Product.
Completion Date
February 28, 1999Termination Date
August 31, 1999Problem
An improved air intake pipe assembly needs to installed on the 3066 Engine used in certain 320B Excavators. The air intake line can loosen at the joint of 1241600 Pipe Assembly. When the joint of the two piece 1241600 Air Intake Pipe Assembly leaks, dust can enter the engine causing high engine oil consumption due to premature wear of the piston rings.
Affected Product
Model & Identification Number
320B (6CR1-2445 5BR1-1612 8ES1-144 9KR1-350 )
320B L (9CS1-153)
320B LL (6LS1-307 9JS1-253 )
Parts Needed
2 - 6V3582 Clamp - Hose1 - 7Y1910 Hose1 - 7Y1916 Hose1 - 7Y1924 Spacer1 - 857329 Spacer1 - 1189827 Pipe AssemblyAction Required
Affected Product
See the attached Rework Procedure.
Parts Stock
Remove all two piece 1241600 Air Intake Pipe Assembly from Parts Stock.
Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification.
Service Claim Allowances
Affected Product
This is a 2-hour job.
U.S. and Canadian Dealers Only - Eligible dealers may enter a Type 2 SIMS Report.
Parts Stock
Submit one claim for all two piece 1241600 Air Intake Pipe Assembly removed from Parts Stock.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.
Attach.(1-Owner Notification)(2-Rework Procedure)Copy Of Owner Notification For U.S. And Canadian Owners
Rework Procedure
1. Park the machine on a level surface and place the front linkage in the servicing position.2. Shut off the engine, move the hydraulic activation control lever to the locked position and remove the start switch key.3. Let the engine cool before starting rework.4. Loosen 5P4868 Clamps (Item B) and two 6V3582 (Item C) 8T4189 Bolts (Items D) and two 7X0579 Washers (Items H) shown in Illustration 1. 5P4868 and 6V3582 Clamps will be reused.5. Remove 1241600 Pipe Assembly (Item A).6. Loosen two 7X0818 Bolts (Item F) and two 8T4224 Washers (Item E). Remove 1241601 Support Assembly (Item G). 7X0818 Bolts and 8T4224 Washer will be reused.7. Install 1189827 Pipe Assembly (Item 1) using two 7X0818 Bolts and two 8T4224 Washers from Step 6. See Illustration 2. Tighten bolts to a torque of 28 7 N m (21 2 ft lb).8. Install one 7Y1916 Hose (Item 3) using two 6V3582 Clamps (Item 2). See Illustration 2. Tighten clamps to a torque of 7.5 .5 N m (5 0.4 ft lb).9. Install one 7Y1910 Hose (Item 4) using one 5P4868 Clamp (Item B) and one 6V3582 Clamp (Item C). See Illustrations 1 and 2. Tighten clamps to a torque of 7.5 0.5 N m (5 0.4 ft lb).
Illustration 1.
Illustration 2.