NHTSA ID Number: 11021399
Manufacturer Communication Number: E323
TSB/Document Date: 2025-08-05
Summary
A required spacer tool set is now available to streamline the injector replacement process. The spacer tool set allows certain fuel system components to be loosened instead of removed to provide access to the injectors. See Bulletin 98-031 for details. Tools are not reimbursable through this Bulletin.
Partial
Source
Container
Locally
Needed
Loctite 242 Thread
Locker or equivalent
Procedure
Please follow your dealership's safety procedures and precautions to ensure the vehicle can be safely repaired and maintained.
Read all steps before beginning.
https://paccarnet.sharepoint.com/sitepages/pwrtrnsvcbltin.aspx?ctx=eyJ3ZWJVcmwiOiJodHRwczovL3BhY2Nhcm5ldC5zaGFyZXBvaW50LmNvbS9zaXRlcy9hdXRob3JzZXJ2aWNlIiwibGlzdElkIjoiNm…
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Powertrain Service Bulletin
Ensure that DAVIE4 is updated to the latest version before connecting to any vehicle for diagnostics or software updates.
1. Order parts as shown in Parts section (above) for engine type.
Ensure all parts have arrived before beginning installation.
2. Replace all 6 injectors with new injectors. Follow the attached procedures document for engine and chassis type.
3. A required spacer tool set is now available to streamline the injector replacement process. The spacer tool set allows certain fuel system
components to be loosened instead of removed to provide access to the injectors. See Bulletin 98-031 for details. Tools are not reimbursable
through this Bulletin.
NOTE
n warranty claim, use injector part numbers
O
stamped on the injectors. Other part
numbers (from ECAT or RMI) may not be the
actual installed injectors and could result in
delayed or denied claims.
Links
E323 - PB Chassis List
INJECTOR R&R PROCEDURES FOR MX-13 EPA24 WITH SPACER TOOL SET
E323 - PB MX-13 Procedure - 579 - With Spacer Tool Set
E323 - PB MX-13 Procedure - 567_589 - With Spacer Tool Set
INJECTOR R&R PROCEDURES FOR MX-13 EPA24 WITHOUT SPACER TOOL SET
E323 - PB MX-13 Injector R&R Procedure_567/589 - Without Spacer Tool Set
E323 - PB MX-13 Injector R&R Procedure_579 - Without Spacer Tool Set
11/12
7/1/25, 3:23 PM
Powertrain Service Bulletin
INJECTOR R&R PROCEDURE FOR MX-11 EPA24
E323 - PB MX-11 Injector R&R Procedure
E323 - PB English Customer Letter
E323 - PB French Customer Letter
12/12
7/1/25, 3:22 PM
Powertrain Service Bulletin
PSB E323: PACCAR
MX EPA24 Phinia Fuel Injector Replacement
Number
Edit
Clone
E323
Description
PACCAR MX EPA24 Phinia Fuel Injector Replacement
Subject
PACCAR MX EPA24 Phinia Fuel Injector Replacement
Supplier
Phinia
Date
11/4/2024
Revision
7/1/2025: Bulletin has been updated with new procedures that include the use of the recently released spacer tool set as defined in 98-031. Warranty
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Powertrain Service Bulletin
section has been updated to include new Quick Claim codes for repairs that use the new Spacer Tool Set.
3/4/2025: Added 163 chassis to chassis list.
1/17/2025: Added chassis to chassis list.
11/7/2024: Included MX-11 engines. Updated chassis list, procedures, and warranty claims.
Condition
Affected EPA24 compliant PACCAR MX engines identified by PACCAR.
Certain chassis equipped with PACCAR MX-11 or MX-13, EPA24 engines are equipped with fuel injectors that may have been manufactured
incorrectly. Affected injectors are at risk of tips fracturing and causing consequential engine damage.
Chassis Affected
1093 (1002 US and 91 Canada) Model Year 2025 T680/T880/W990/L770 chassis built from 05/09/2024 to 09/26/2024 and equipped with EPA2024
compliant PACCAR MX-11 or MX-13 engines.
Action
Campaign
Service all chassis affected that enter your dealership, even if the customer has no issue with the chassis.
1. Review the attached chassis list for your dealer code and schedule your customer(s) for service if their chassis is on the list.
2. Confirm with the customer that your dealership will be the servicing location before ordering parts.
3. Ensure all parts have arrived before scheduling the customer for installation.
4. In Service Management, select Campaign E323 to add it to the case. If the unit is released back into service without performing the repair, make sure
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Powertrain Service Bulletin
to also release the Campaign in Service Management
5. If you are not using Service Management to start repair orders, review SIR for “Complete” or "In Process" next to the E323 campaign code prior to
performing this repair.
6. Reference the appropriate repair procedure in the Links section below for directions on removing and replacing fuel injectors.
Warranty
For repairs completed by 12/01/2025, Kenworth will pay for parts at dealer net plus applicable mark-up and labor:
A required spacer tool set is now available to streamline the injector replacement process. The spacer tool set allows certain fuel system components
to be loosened instead of removed to provide access to the injectors. See Bulletin TIB 98-031 for details. Tools are not reimbursable through this
Bulletin.
5.8 hours to replace 6 injectors on PACCAR MX-13 engines in T680 chassis without spacer tool set. Use editable Quick Claim code E323A.
5.4 hours to replace 6 injectors on PACCAR MX-13 engines in T880/W990 chassis without spacer tool set. Use editable Quick Claim code
E323B.
4.0 hours to replace 6 injectors on PACCAR MX-11 engines. Use editable Quick Claim code E323C.
3.9 hours to replace 6 injectors on PACCAR MX-13 engines in T680 chassis with spacer tool set. Use editable Quick Claim code E323D.
3.5 hours to replace 6 injectors on PACCAR MX-13 engines in T880/W990 chassis with spacer tool set. Use editable Quick Claim code
E323E.
Dealers must edit Quick Claims to include injector PNs used. See Parts section for more information.
File an additional claim for extraordinary circumstances. A quick claim for standard labor must be filed first.
File the claim within 14 days in accordance with Warranty Policy CA009.
Kenworth dealers may perform E323 repairs on Peterbilt chassis, but Quick Claims do not apply. For Peterbilt chassis repairs, use the long claim
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Powertrain Service Bulletin
input form.
Take off parts disposition: Return removed injector cores through EZTrac.
PRWS CLAIM CODING
Campaign Code:
E323
Campaign Type
Field Repair
Claim Category:
Engine
Repair Type
Proactive
Customer Concern 007
Code
Causal Code
A1
Corrective Action
Code
12
Responsibility
Code:
CampSupp
Failure Location
044-014-001 Causal Part
2426856PEX (MX13 Injector)
Supplier Code
77009
B24-52A
5.8 hrs
Replace 6 injectors
on MX-13 per
bulletin procedure
E323 without
spacer tool set
(T680)
SRT Code
B24-52B
5.4 hrs
Replace 6 injectors
on MX-13 per
bulletin procedure
https://paccarnet.sharepoint.com/sitepages/pwrtrnsvcbltin.aspx?ctx=eyJ3ZWJVcmwiOiJodHRwczovL3BhY2Nhcm5ldC5zaGFyZXBvaW50LmNvbS9zaXRlcy9hdXRob3JzZXJ2aWNlIiwibGlzdElkIjoiNmFl…
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Powertrain Service Bulletin
E323 without
spacer tool set
(T880/W990)
B24-52C
4.0 hrs
Replace 6 injectors
on MX-11 per
bulletin procedure
E323.
B24-52D
3.9 hrs
Replace 6 injectors
on MX-13 per
bulletin procedure
E323 with spacer
tool set (T680)
B24-52E
3.5 hrs
Replace 6 injectors
on MX-13 per
bulletin procedure
E323 with spacer
tool set
(T880/W990)
Parts
Parts are available from PACCAR Parts.
Injector Replacement Parts – MX-13
Quantity
6
Part
Number
2426856PEX
Description
Injector, MX-13, EPA21/24 (Package of 1)
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Powertrain Service Bulletin
Injector Replacement Parts – MX-13
OR
1
2434417PEX
OR
2461236PEX
INJECTOR, MX-13, EPA21/24 (Package of 6)
6
1313120PE
Flange Bolt, 10.9
1
2105834
Valve Cover Gasket
1
2105835
Valve train casing gasket
2
1858035
Usit Ring
As
Needed
EC3501 (US)
EC7501
(Canada)
As
Needed
Source
Locally
Partial
Source
Container
Locally
Needed
Electrical Contact Cleaner
Partial
Source
Container
Locally
Needed
Loctite 242 Thread Locker or equivalent
The following parts are used ONLY when performing this repair
WITHOUT SPACER TOOL SET
1
2272926
Fuel Filter Element Set (With O-Rings)
1
2138144
Gasket, Oil Fill Pipe
1
2253166
O-ring (Fuel Filtration Module mounting)
1
2253167
Sealing Ring (Fuel Filtration Module mounting)
1
F37-1022100
Dryer-Receiver with Dye
Partial
Container
Needed D14858530
(Max
8oz)
Refrigerant, R134a
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Powertrain Service Bulletin
Injector Replacement Parts – MX-13
Partial
Container
Needed LM1020
(Max
2oz)
Oil-PAG, 250cc (A/C oil, SP15)
Injector Replacement Parts – MX-11
Quantity
6
Part
Number
2426855PEX
Description
Injector, MX-11, EPA21/24 (Package of 1)
OR
1
2434418PEX
OR
2461235PEX
INJECTOR, MX-11, EPA21/24 (Package of 6)
6
1313120PE
Flange Bolt, 10.9
1
2272926
Fuel Filter Element Set (With O-Rings)
1
1900010
Valve Cover Gasket
1
1917012
Flange gasket (inlet manifold)
1
1876805
1
2235755
Sealing Ring (Inlet horn to venturi)
1
2015102
O-ring (non-return valve)
1
2004292
O-Ring (injector leak pipe)
Source
Partial
Locally
Container
P-80 Lubricant or equivalent (EGR pipe O-ring)
Available at
Needed
Primo Supply
As
Needed
EC3501 (US)
EC7501
(Canada)
As
Needed
Source
Locally
7/9
7/1/25, 3:22 PM
Powertrain Service Bulletin
Injector Replacement Parts – MX-11
Partial
Source
Container
Locally
Needed
Electrical Contact Cleaner
Partial
Source
Container
Locally
Needed
Loctite 242 Thread Locker or equivalent
Procedure
Please follow your dealership's safety procedures and precautions to ensure the vehicle can be safely repaired and maintained.
Read all steps before beginning.
Ensure that DAVIE4 is updated to the latest version before connecting to any vehicle for diagnostics or software updates.
1. Order parts as shown in Parts section (above) for engine type.
Ensure all parts have arrived before beginning installation.
2. Replace all 6 injectors with new injectors. Follow the attached procedures document for engine and chassis type.
3. A required spacer tool set is now available to streamline the injector replacement process. The spacer tool set allows certain fuel system
components to be loosened instead of removed to provide access to the injectors. See Bulletin 98-031 for details. Tools are not reimbursable
through this Bulletin.
NOTE
On warranty claim, use injector part numbers stamped on the injectors.
Other part numbers (from ECAT or RMI) may not be the actual installed
injectors and could result in delayed or denied claims.
8/9
7/1/25, 3:22 PM
Powertrain Service Bulletin
Links
KW Chassis List
E323 KW MX-13 Procedure T680 Without Spacer Tool Set
E323 KW MX-13 Procedure T880/W990 Without Spacer Tool Set
E323 KW MX-13 Procedure T680 With Spacer Tool Set
E323 KW MX-13 Procedure T880/W990 With Spacer Tool Set
E323 KW Procedures – MX-11
KW Customer Letter
Authored by: JB3
9/9
- Restores fuel economy
- Stabilizes ethanol
- Maximizes horsepower
- Improves responsiveness
- For use in both gasoline and diesel engines
- DESIGNED TO EXCEED EXPECTATIONS: Red Line complete SI-1 fuel...
- PERFORM AND PROTECT: Fuel additive cleans injectors...
- EFFICIENT FUEL BURN: Gas treatment that enhances gasoline...
- EASY TO USE: Use one bottle per tank for most effective...
- 15 Ounce (2 Pack)
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TSB/Document ID: E323
Replacement Service Bulletin Number:
MFR Communication Date: 2025-07-02
MFR Internal Campaign ID/Software Version: E323
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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