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.
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Powertrain Service Bulletin
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Powertrain Service Bulletin
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
11/1/2024
Revision
07/01/2025: Bulletin has been updated with new procedures that include the use of the recently released spacer tool set as defined in 98-031. Warranty
section has been updated to remove infrequently used Recommended Repairs and to include new Recommended Repair codes for repairs that use the
new Spacer Tool Set.
03/05/2025: 222 chassis added to chassis list. Total population is now 1,226 chassis.
01/17/2025: 263 chassis added to chassis list. Total population is now 1,004 chassis.
11/08/2024: PACCAR MX-11 EPA24 engines included in campaign. Warranty section has been updated with MX-11 specific recommended repair codes.
MX-11 specific fuel injector R&R procedure has been added to the Links section.
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.
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Powertrain Service Bulletin
Affected injectors are at risk of tips fracturing and causing consequential engine damage.
Campaign Start Date: 11/01/2024
Chassis Affected
1,226 (1,106 US and 120 Canada) Specific model year 2025 520, 567, 579, and 589 chassis built from 05/24/2024 to 11/08/2024 and equipped with a
PACCAR MX-13 or MX-11, EPA24 engine.
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 repairing 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
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.
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Powertrain Service Bulletin
Warranty
Starting from 11/01/2024, through 12/01/2025, Peterbilt 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 98-031 for details. Tools are not reimbursable
through this Bulletin.
If a Fuel Injector part number other than those specifically listed in Recommended Repairs G, H, J, K, or L (2461236PEX or 2461235PEX) is used, file claim
using editable Recommended Repair E323.
USE THE FOLLOWING RECOMMENDED REPAIRS WHEN NOT USING THE NEW SPACER TOOL SET:
5.8 hours to replace 6 injectors on PACCAR MX-13 engines in 579 chassis. Use Recommended Repair code E323G. (2461236PEX)
5.4 hours to replace 6 injectors on PACCAR MX-13 engines in 567 and 589 chassis. Use Recommended Repair code E323H. (2461236PEX)
4.0 hours to replace 6 injectors on PACCAR MX-11 engines. Use Recommended Repair code E323J. (2461235PEX)
USE THE FOLLOWING RECOMMENDED REPAIRS WHEN USING THE NEW SPACER TOOL SET:
3.9 hours to replace 6 injectors on PACCAR MX-13 engines in 579 chassis. Use Recommended Repair code E323K. (2461236PEX)
3.5 hours to replace 6 injectors on PACCAR MX-13 engines in 567 and 589 chassis. Use Recommended Repair code E323L. (2461236PEX)
For supplemental claims, file a long form claim and use E323 in the “Campaign Code” field.
File the claim within 7 days in accordance with Warranty Policy.
Peterbilt dealers may perform E323 repairs on Kenworth chassis, but Recommended Repairs do not apply. For engine repairs on Kenworth chassis,
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Powertrain Service Bulletin
use long form claim and enter E323 in the “Campaign Code” field.
Take-Off Parts Disposition: Return removed injector cores through EZTrac.
PRWS CLAIM CODING
Campaign
E323
Code:
ampaign
C
Type:
Field Repair
Claim
Engine Repair Type: Proactive
Category:
Customer
Concern 007
Code:
Causal Code: A1
orrective
C
Action
12
Code:
esponsibility
R
SUP
Code:
044Failure
014Location:
001
Causal Part:
Supplier
Code:
77009 SRT Code:
2426856PEX
24-52A
B
5.8 hours
Replace 6
injectors on
MX-13 per
bulletin
procedure
E323.
(model 579
Without
Spacer Tool
Set.)
B24-52B
5.4 hours
Replace 6
injectors on
MX-13 per
5/12
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Powertrain Service Bulletin
bulletin
procedure
E323.
(models
567 and 589
Without
Spacer Tool
Set.)
B24-52C
4.0 hours
Replace 6
injectors on
MX-11 per
bulletin
procedure
E323.
B24-52D
3.9 hours
Replace 6
injectors on
MX-13 per
bulletin
procedure
E323
(model 579
With Spacer
Tool Set.)
B24-52E
3.5 hours
Replace 6
injectors on
MX-13 per
bulletin
procedure
E323
(models
https://paccarnet.sharepoint.com/sitepages/pwrtrnsvcbltin.aspx?ctx=eyJ3ZWJVcmwiOiJodHRwczovL3BhY2Nhcm5ldC5zaGFyZXBvaW50LmNvbS9zaXRlcy9hdXRob3JzZXJ2aWNlIiwibGlzdElkIjoiNmF…
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Powertrain Service Bulletin
567 and 589
With Spacer
Tool Set.)
Parts
Parts are available from PACCAR Parts.
Parts Required - MX-13
Quantity
Part
Number
Description
1
2461236PEX
Injector, MX-13,
EPA21/24
(Package of 6)
Only use fuel injector part numbers below if
2461236PEX is not available.
1
2434417PEX
INJECTOR, MX-13,
EPA21/24
(Package of 6)
OR
6
INJECTOR, MX-13,
2426856PEX
EPA21/24
(Package of 1)
6
1313120PE
Flange Bolt, 10.9
1
2105834
Valve Cover Gasket
1
2105835
Valve train casing
gasket
1
1858035
Usit Ring
EC3501 (US)
As
Needed
As
EC7501
(Canada)
Source
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Powertrain Service Bulletin
Parts Required - MX-13
Quantity
Part
Number
Needed
Locally
Partial
Container
Needed
Source
Locally
Electrical Contact
Cleaner
Partial
Container
Needed
Source
Locally
Loctite 242 Thread
Locker or equivalent
Description
The following parts are used ONLY when
performing this repair WITHOUT SPACER
TOOL SET.
Injector Replacement Parts – MX-13
Quantity
Part
Number
Description
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
Partial
LM1020
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Powertrain Service Bulletin
Parts Required - MX-13
Quantity
Part
Number
Description
Container
Needed
(Max
2oz)
oil, SP15)
Parts Required - MX-11
Quantity
1
Part
Number
Description
Injector, MX-11,
2461235PEX EPA21/24
(Package of 6)
Only use fuel injector part numbers below if
2461235PEX is not available.
6
2426855PEX INJECTOR, MX-11,
EPA21/24
(Package of 1)
O
R
1
INJECTOR, MX-11,
2434418PEX EPA21/24
(Package of 6)
6
1313120PE Flange bolt 10.9
1
2272926PE
1
1900010PE Valve cover gasket
1
1917012PE
Fuel Filter Element
Set (With O-Rings)
Flange gasket (inlet
manifold)
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Powertrain Service Bulletin
Parts Required - MX-11
Part
Number
Description
1
1876805PE
1
2235755PE
Sealing Ring (Inlet
horn to venturi)
1
2015102PE
O-ring (non-return
valve)
1
2004292PE
O-Ring (injector leak
pipe)
Quantity
Source
Partial
Locally
P-80 Lubricant or
Container Available at equivalent (EGR
Needed Primo
pipe O-ring)
Supply
As
Needed
EC3501 (US)
EC7501
Coolant
(Canada)
As
Needed
Source
Locally
Partial
Source
Container
Locally
Needed
Electrical Contact
Cleaner
- 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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