NHTSA ID Number: 11029643
Manufacturer Communication Number: E335
TSB/Document Date: 2026-03-05
Summary
Certain EPA21 compliant PACCAR
MX-13 engines were built with intake valve springs that could fail. This failure can cause significant damage to the engine. New intake valve springs will be installed.
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TSB/Document ID: E335
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-20
MFR Internal Campaign ID/Software Version: E335
Communication Type: Service Campaign
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
E335: PACCAR MX-13 EPA21 Scherdel Intake Valve Spring
Replacement
Number
Edit
Clone
E335
Description
PACCAR MX-13 EPA21 Scherdel Intake Valve Spring Replacement
Subject
PACCAR MX-13 EPA21 Scherdel Intake Valve Spring Replacement
Supplier
Scherdel
Date
2/19/2026
Condition
Certain EPA21 compliant PACCAR MX-13 engines identified as having suspect intake valve springs.
Chassis Affected
2,117 (1,825 US and 292 Canada) vehicle model year 2022-2023 T680, T880, W990 built from 12/16/2021
through 5/9/2022 equipped with EPA21 compliant PACCAR MX-13 engines.
Action
Campaign
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. In Service Management, select Campaign E335 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
3. If you are not using Service Management to start repair orders, review SIR for “Complete” or "In
Process" next to the E335 campaign code prior to performing this repair.
4. Follow the procedures below to replace 12 intake valve springs.
Warranty
Starting on 2/19/2026 and for repairs completed by 3/1/2027, Kenworth will pay for parts at dealer net plus
applicable mark-up and labor:
4.5 hours of labor to replace 12 intake valve springs on T680 chassis. Select Recommended Repair code
E335A.
4.9 hours of labor to replace 12 intake valve springs on T680 Short Hood chassis. Select Recommended
Repair code E335B.
4.4 hours of labor to replace 12 intake valve springs on T880/W990 chassis. Select Recommended Repair
code E335C.
File an additional claim for extraordinary circumstances. A Recommended Repair for standard labor
must be filed first.
File the claim within 14 days in accordance with the Warranty Policy.
Kenworth dealers may perform E335 repairs on Peterbilt chassis, but Recommended Repairs do not
apply. For Peterbilt chassis repairs, use the long claim input form.
Take off parts disposition: Destroy 30 days after claim is paid
PRWS CLAIM CODING
Campaign E335
Code:
Campaign
Type
Field Repair
Claim
Engine Repair Type
Category:
Proactive
Customer 202
Concern
Code
Causal Code
12
Corrective 12
Action
Code
Responsibility CAMPSUPP
Code:
Failure
Location
045008037
Causal Part
Supplier
Code
85971
2264673PE
B26-11A
4.5 hrs
PACCAR MX-13 EPA21 Intake
Valve Spring Replacement
T680/579 per bulletin
procedure
SRT Code
B26-11B
4.9 hrs
PACCAR MX-13 EPA21 Intake
Valve Spring Replacement
T680/579 (Short Hood) per
bulletin procedure
B26-11C
4.4 hrs
PACCAR MX-13 EPA21 Intake
Valve Spring Replacement
T880/W990/567/365/367/389
per bulletin procedure
Parts
Parts are available from PACCAR Parts.
Quantity
Part
Number
Description
12
2264673PE Valve Spring (Inlet)
1
2105834
Valve cover gasket
1
2105835
Valve train casing gasket
AS
Needed
(Up to 1
gallon)
EC3501
(US)
EC7501
(Canada)
Coolant (for top-off on short
hood T680/579 chassis only)
Partial
Source
Container
Locally
Needed
Electrical Contact Cleaner
Procedure
WARNING
Repair or maintenance procedures may pose a safety
risk in limited circumstances. You must read all
procedure steps before performing any work and
follow all dealership safety procedures or precautions.
Failure to comply may result in death, personal injury,
or property damage.
Replace 12 engine intake valve springs following the attached procedures.
Links
KW Chassis List
PB Chassis List
Repair Procedure – Model 365/367/389
Repair Procedure – T680/579
Repair Procedure – T880/567
RMI Steps - Intake Valve Springs
Customer Letter - KW
Customer Letter - PB
Authored by: JB3
Kenworth Truck Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888
[Date]
Subject: E335: PACCAR MX-13 EPA21 Scherdel Intake Valve Spring Replacement
Expiration Date: 3/1/2027
FIELD SERVICE CAMPAIGN
This notice applies to your vehicle(s) with VIN(s) at the bottom or back of this page.
Dear Kenworth Customer,
Kenworth Truck Company has determined that certain T680, T880, and W990 vehicles built from
12/16/2021 through 5/9/2022 with PACCAR MX-13 engines have intake valve springs that may
fail, causing significant engine damage.
What is the problem?
Certain PACCAR MX-13 intake valve springs may fail.
What will your dealer do?
Replace the engine intake valve springs.
What should you do?
Contact your dealer to schedule a repair appointment. This
service may require up to 5.0 hours of labor.
To locate your nearest dealer please scan the QR code at the top of this letter or use the Dealer
Locator at www.Kenworth.com. When scheduling this service, please refer to campaign E335:
PACCAR MX-13 EPA21 Scherdel Intake Valve Spring Replacement and the VIN(s) listed in this
letter. There will be no charge to you if completed by 3/1/2027.
If you no longer own the vehicle(s), please send an email to servicebulletins@paccar.com with the
complete VIN(s) and the name and address of the new owner.
We appreciate your attention to this matter and value your loyalty to Kenworth and its dealer
network.
Sincerely,
Kenworth Customer Service
E335: PACCAR MX-13 EPA21 Scherdel Intake Valve Spring
Replacement
Number
Edit
Clone
E335
Description
PACCAR MX-13 EPA21 Scherdel Intake Valve Spring Replacement
Subject
PACCAR MX-13 EPA21 Scherdel Intake Valve Spring Replacement
Supplier
Scherdel
Date
2/19/2026
Condition
Certain EPA21 compliant PACCAR MX-13 engines identified as having suspect intake valve springs.
Chassis Affected
2,140 (1,906 US and 234 Canada) vehicle model year 2022-2023 model 365, 367, 389, 567, 579 built from
12/10/2021 through 5/10/2022 equipped with EPA21 compliant PACCAR MX-13 engines.
Action
Campaign
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. In Service Management, select Campaign E335 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
3. If you are not using Service Management to start repair orders, review SIR for “Complete” or "In
Process" next to the E335 campaign code prior to performing this repair.
4. Follow the procedures below to replace 12 intake valve springs.
Warranty
Starting on 2/19/2026 and for repairs completed by 3/1/2027, Peterbilt will pay for parts at dealer net plus
applicable mark-up and labor:
4.5 hours of labor to replace 12 intake valve springs on 579 chassis. Select Recommended Repair code
E335A.
4.9 hours of labor to replace 12 intake valve springs on 579 Short Hood chassis. Select Recommended
Repair code E335B.
4.4 hours of labor to replace 12 intake valve springs on 567/365/367/389 chassis. Select Recommended
Repair code E335C.
File an additional claim for extraordinary circumstances. A Recommended Repair for standard labor
must be filed first.
File the claim within 14 days in accordance with the Warranty Policy.
Peterbilt dealers may perform E335 repairs on Kenworth chassis, but Recommended Repairs do not
apply. For Kenworth chassis repairs, use the long claim input form.
Take off parts disposition: Destroy 30 days after claim is paid
PRWS CLAIM CODING
Campaign E335
Code:
Campaign
Type
Field Repair
Claim
Engine Repair Type
Category:
Proactive
Customer 202
Concern
Code
Causal Code
12
Corrective 12
Action
Code
Responsibility CAMPSUPP
Code:
Failure
Location
045008037
Causal Part
Supplier
Code
85971
2264673PE
B26-11A
4.5 hrs
PACCAR MX-13 EPA21 Intake
Valve Spring Replacement
T680/579 per bulletin
procedure
SRT Code
B26-11B
4.9 hrs
PACCAR MX-13 EPA21 Intake
Valve Spring Replacement
T680/579 (Short Hood) per
bulletin procedure
B26-11C
4.4 hrs
PACCAR MX-13 EPA21 Intake
Valve Spring Replacement
T880/W990/567/365/367/389
per bulletin procedure
Parts
Parts are available from PACCAR Parts.
Quantity
Part
Number
Description
12
2264673PE Valve Spring (Inlet)
1
2105834
Valve cover gasket
1
2105835
Valve train casing gasket
AS
Needed
(Up to 1
gallon)
EC3501
(US)
EC7501
(Canada)
Coolant (for top-off on short
hood T680/579 chassis only)
Partial
Source
Container
Locally
Needed
Electrical Contact Cleaner
Procedure
WARNING
Repair or maintenance procedures may pose a safety
risk in limited circumstances. You must read all
procedure steps before performing any work and
follow all dealership safety procedures or precautions.
Failure to comply may result in death, personal injury,
or property damage.
Replace 12 engine intake valve springs following the attached procedures.
Links
KW Chassis List
PB Chassis List
Repair Procedure – Model 365/367/389
Repair Procedure – T680/579
Repair Procedure – T880/567
RMI Steps - Intake Valve Springs
Customer Letter - KW
Customer Letter - PB
Authored by: JB3
Peterbilt Motors Company
Customer Service Department
C/O PACCAR Parts
750 Houser Way North
Renton, WA 98057
(425) 828-5888
[Date]
Subject: E335: PACCAR MX-13 EPA21 Scherdel Intake Valve Spring Replacement
Expiration Date: 3/1/2027
FIELD SERVICE CAMPAIGN
This notice applies to your vehicle(s) with VIN(s) listed at the bottom or back of this page.
Dear Peterbilt Customer,
Peterbilt Motors Company has determined that certain model 365, 367, 389, 567, and 589 vehicles
built from 12/10/2021 through 5/10/2022 with PACCAR MX-13 engines have intake valve springs
that may fail, causing significant engine damage.
What is the problem?
Certain PACCAR MX-13 intake valve springs may fail.
What will your dealer do?
Replace the engine intake valve springs.
What should you do?
Contact your dealer to schedule a repair appointment. This
service may require up to 5.0 hours of labor.
To locate your nearest dealer please scan the QR code at the top of this letter or use Find a Dealer
at www.Peterbilt.com. When scheduling this service, please refer to campaign E335: PACCAR
MX-13 EPA21 Scherdel Intake Valve Spring Replacement and the VIN(s) listed in this letter.
There will be no charge to you if completed by 3/1/2027.
If you no longer own the vehicle(s), please send an e-mail to servicebulletins@paccar.com with
the complete VIN(s) and the name and address of the new owner.
We appreciate your attention to this matter and value your loyalty to Peterbilt and its dealer
network.
Sincerely,
Peterbilt Customer Service
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