NHTSA ID Number: 11030932
Manufacturer Communication Number: E335
TSB/Document Date: 2026-04-07
Summary
Expiration Date Format Update - 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.
E335: PACCAR MxX-13 EPA21 Scherdel Intake Valve Spring
Replacement
Number 7 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
Revision
3/10/2026: Updated bulletin to include parts reserve status and ordering instructions.
3/18/2026: Updated Recommended Repairs and SRT times to include T680 Next Gen/New Model 579
and T680 Classic/Model 579 differences.
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. If the engine is replaced with a Long Block, Full Swing, or the Cylinder Head Assembly is replaced
for any other reason after 5/10/2022, E335 does not need to be performed. Email
pb.warsystem@paccar.com or [email protected] to mark the
campaign complete. Include the Chassis Number and date of the engine repair, and what was
replaced in the email (long block, full swing, cylinder head). Note that a short block replacement
does not eliminate the need for E335.
3. 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
4. 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.
5. 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:
e 4.5 hours of labor to replace 12 intake valve springs on T680 Next Gen chassis. Select
Recommended Repair code E335A.
¢ 4.9 hours of labor to replace 12 intake valve springs on T680 Next Gen Short Hood chassis. Select
Recommended Repair code E335B.
e 4.4 hours of labor to replace 12 intake valve springs on T880/W990/T680 Classic chassis. Select
Recommended Repair code E335C.
¢ File an additional claim for extraordinary circumstances. A Recommended Repair for standard
labor must be filed first.
e 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 |Campaign Field Repair
Code: Type
Claim Engine|Repair Type |Proactive
Category:
Customer |202 |Causal Code |12
Concern
Code
Corrective |12 Responsibility | CAMPSUPP.
Action Code:
Code
Failure 045- |Causal Part 2264673PE
Location |008-
037
Supplier |85971 B26-11A
Code 4.5 hrs
PACCAR MX-13 EPA21 Intake Valve
Spring Replacement T680NG/NM579
per bulletin procedure
B26-11B
4.9 hrs
PACCAR MX-13 EPA21 Intake Valve
SRT Code | spring Replacement T680NG/NM579
(Short Hood) per bulletin procedure
B26-11C
4.4 hrs
PACCAR MX-13 EPA21 Intake Valve
Spring Replacement
T680/T880/W990/567/579/365/367/389
per bulletin procedure
Parts
Intake Valve Spring inventory is currently limited and has been placed on reserve status. Dealers must
submit a TCS365 case as shown below. PACCAR Parts continues to receive regular inventory shipments
to the PDCs.
1. Open TCS365 in Google Chrome or Microsoft Edge.
2. Select Order Support | Order Inquiry.
3. Select Case Type: Place an Order
4. Select Case Category: Campaign
5. On the Place an Order page, fill in the following fields as shown and fill in the other fields as
appropriate:
© Account Name: appropriate for your dealer
© Vehicle Year: Chassis Model Year
© RH Sheppard Recall: Select NO
© Subject: E335 Valve Springs
© Campaign Name: E335 Valve Springs
© Dealer PO#: Dealer purchase order number
© Shipping method: Select from drop-down list
o Part Number: 2264673PE
© Vehicle OEM: Select from drop-down list
© Vehicle Chassis Number: Last 8 digits of VIN
© Quantity: 12 per chassis
. Part a
Quantity
112 |2264673PE| Valve Spring (Inlet)
2105834 |Valve cover gasket
1 [2105835 Valve train casing gasket
AS EC3501 Coolant (for top-off on short
Needed /(US) hood T680/579 chassis
(Up to1 |EC7501 only)
gallon) |(Canada) Y
Partial Ss
Container rocalty Electrical Contact Cleaner
Needed y
Procedure
A 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 — T680NG/NM579
Repair Procedure — T880/T680/579/567
RMI Steps - Intake Valve Springs
Customer Letter - KW
Customer Letter - PB
Authored by: JB3
E335: PACCAR MxX-13 EPA21 Scherdel Intake Valve Spring
Replacement
7 Edit © Clone
Number
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
Revision
3/10/2026: Updated bulletin to include parts reserve status and ordering instructions.
3/18/2026: Updated Recommended Repairs and SRT times to include T680 Next Gen/New Model 579
and T680 Classic/Model 579 differences.
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. If the engine is replaced with a Long Block, Full Swing, or the Cylinder Head Assembly is replaced
for any other reason after 5/10/2022, E335 does not need to be performed. Email
[email protected] or [email protected] to mark the
campaign complete. Include the Chassis Number and date of the engine repair, and what was
replaced in the email (long block, full swing, cylinder head). Note that a short block replacement
does not eliminate the need for E335.
3. 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
4. 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.
5. 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:
e 4.5 hours of labor to replace 12 intake valve springs on New Model 579 chassis. Select
Recommended Repair code E335A.
e 4.9 hours of labor to replace 12 intake valve springs on New Model 579 Short Hood chassis. Select
Recommended Repair code E335B.
e 4.4 hours of labor to replace 12 intake valve springs on 567/579/365/367/389 chassis. Select
Recommended Repair code E335C.
e 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 |Campaign Field Repair
Code: Type
Claim Engine|Repair Type |Proactive
Category:
Customer |202 |Causal Code |12
Concern
Code
Corrective |12 Responsibility) CAMPSUPP.
Action Code:
Code
Failure 045- |Causal Part 2264673PE
Location |008-
037
Supplier |85971 B26-11A
Code 4.5 hrs
PACCAR MX-13 EPA21 Intake Valve
Spring Replacement T680NG/NM579
per bulletin procedure
B26-11B
4.9 hrs
PACCAR MX-13 EPA21 Intake Valve
SRT Code | spring Replacement T680nG/NM579
(Short Hood) per bulletin procedure
B26-11C
4.4 hrs
PACCAR MX-13 EPA21 Intake Valve
Spring Replacement
T880/W990/T680/567/579/365/367/389
per bulletin procedure
Parts
Intake Valve Spring inventory is currently limited and has been placed on reserve status. Dealers must
submit a TCS365 case as shown below. PACCAR Parts continues to receive regular inventory shipments
to the PDCs.
1. Open TCS365 in Google Chrome or Microsoft Edge.
2. Select Order Support | Order Inquiry.
3. Select Case Type: Place an Order
4. Select Case Category: Campaign
5. On the Place an Order page, fill in the following fields as shown and fill in the other fields as
appropriate:
© Account Name: appropriate for your dealer
© Vehicle Year: Chassis Model Year
© RH Sheppard Recall: Select NO
© Subject: E335 Valve Springs
© Campaign Name: E335 Valve Springs
° Dealer PO#: Dealer purchase order number
© Shipping method: Select from drop-down list
© Part Number: 2264673PE
© Vehicle OEM: Select from drop-down list
© Vehicle Chassis Number: Last 8 digits of VIN
© Quantity: 12 per chassis
. Part A
Quantity
112 |2264673PE| Valve Spring (Inlet)
2105834 | Valve cover gasket
1 2405835 Valve train casing gasket
AS EC3601 Coolant (for top-off on short
Needed |(US) hood T680/579 chassis
(Up to 1 |EC7501 only)
gallon) |(Canada) y
Partial Sour
Container row iy Electrical Contact Cleaner
Needed ocally
Procedure
A 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 — T680NG/NM579
Repair Procedure — T880/T680/579/567
RMI Steps - Intake Valve Springs
Customer Letter - KW
Customer Letter - PB
Authored by: JB3
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TSB/Document ID: E335
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-25
MFR Internal Campaign ID/Software Version: E335
Communication Type: Emissions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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