PACCAR MX-13 Cylinder Head Bolt Set

This new cylinder head bolt set provides the replacement hardware required when installing a cylinder head on compatible 12.9L PACCAR MX-13 diesel engines. The kit contains 26 cylinder head bolts designed to provide secure cylinder head retention when installed according to the engine manufacturer’s specifications.

Cylinder head bolts are subjected to substantial clamping force, heat, and repeated engine operating cycles. Worn, stretched, damaged, or previously used bolts may prevent the cylinder head from being clamped correctly. Replacing the complete bolt set during cylinder head service helps support proper gasket sealing, consistent clamping force, and dependable engine operation.

Compatible Applications

This PACCAR MX-13 cylinder head bolt kit may fit compatible 12.9L engine applications found in select:

• Kenworth T400
• Kenworth T680
• Peterbilt 337
• Peterbilt 389
• Peterbilt 567
• Peterbilt 579
• Peterbilt 579-117

Important: Vehicle model alone is not sufficient to confirm compatibility. PACCAR MX-13 components can vary by model year, emissions generation, engine serial number, and original equipment configuration. Verify the engine serial number and existing bolt part number before ordering.

What Is Included?

• 26 cylinder head bolts
• Bolt specification: M18 x 2 x 20

Product Specifications

• Product type: Cylinder head bolt set
• Engine make: PACCAR
• Engine model: MX-13 / MX13
• Engine displacement: 12.9L
• Condition: New
• Manufacturer number: 2301199PE, 259.560
• Quantity: 26 bolts
• Gross weight: 10.806 lb
• UPC/EAN: 041248597866

Cross-reference numbers are provided for identification purposes. Always compare the original part number and confirm compatibility using the PACCAR engine serial number before completing your purchase.

Why Replace the Cylinder Head Bolts?

Correct cylinder head clamping is essential for maintaining the seal between the cylinder head, head gasket, and engine block. Reusing bolts that are stretched, corroded, damaged, or outside the manufacturer’s specifications may contribute to improper clamping, combustion-gas leakage, coolant loss, oil contamination, or premature head-gasket failure.

A complete replacement set also helps ensure that all cylinder head fastening positions use compatible hardware from the same kit.

Installation Recommendations

Installation should be performed by a qualified heavy-duty diesel technician. Follow the current PACCAR service information for the specific MX-13 engine serial number, including the prescribed bolt sequence, tightening stages, torque values, angle-tightening procedure, and lubrication requirements.

Before installation, inspect the cylinder head, engine block deck, bolt holes, threads, head gasket, and sealing surfaces. Do not rely on general torque specifications because procedures may vary between PACCAR MX-13 engine generations.

Frequently Asked Questions

How many bolts are included in this head bolt kit ?

This cylinder head bolt kit includes 26 bolts for compatible PACCAR MX-13 cylinder head installations.

Does this bolt set fit every PACCAR MX13 engine?

Not necessarily. MX13 component requirements can vary by engine serial number, production date, and emissions configuration. Confirm fitment using the engine serial number and original bolt part number.

Can old PACCAR MX13 cylinder head bolts be reused?

Follow the applicable PACCAR service manual. If the bolts are designated for one-time use or fail the manufacturer’s inspection criteria, replace them with a complete new set.

Fitment Assistance

Need help confirming whether this kit is correct for your PACCAR MX-13 engine? Contact Heavy Duty Kits at 888-642-6460 or parts@heavydutykits.com. Provide the engine serial number and original part number for faster fitment verification.