Plant Comm

07/27/2023- Fuel Accumulator leak
Completed
BACKGROUND
•
8 issues notified from the OEMs for accumulator fitting leaks. All issues found in BIS
Customer
5 other OEMs
KENWORTH TRUCK COMPANY
KENWORTH TRUCK COMPANY
KENWORTH TRUCK COMPANY
Level of Leak
Level 1, Level 5
Level 1
Level 1
Level 3
ESN
1st
• Accumulator Inventory inhouse at RMEP has the 1st accumulator fittings torqued to
175NM (ESNF : 99143489).
99105429
99113281
99105491
FAULT CODE/FAIL MODE
• Leaks have been observed on the
STATUS: Open
accumulator fittings in all the 8 issues found until now.
CURRENT STATE
NEXT STEPS
• Engines which are at the OEMs before the clean point need to be touched by the
techs to change the accumulator fitting torque to 175NM.
• Provide the work instructions for the onsite techs to rework the accumulator fittings
to 175 NM.
• Supplier Leak Test(Retest)
• 125 suspect fuel rails based on the manufacturing date. 4 out of 125 were released by
supplier after retesting belonging to the same manufacturing date. 3 out of those 4
matched with the ones that were leaking at the OEM.
• 4th accumulator failed at RMEP in the hot test for Crank Fuel Decay High(CFDH) fault.
• Clean point was established - ESN 99121169
• Leaks found outside of the suspect list of 125
• The 1st accumulator fittings are to be torqued to 175 NM as a part of step 3.
• Proposed change is parented from India B fuel system FIRG #58525 in 2017
ROOT CAUSE AND GOAL STATEMENT
• Assignable cause - Uneven loading at fitting-to-rail interface
1