2024-2026 Jeep, Ram, Dodge Cylinder Head Bolt Inspection

Mopar has issued a Quality Inspection Request (QIR) regarding specific cylinder head cover bolts, identified by part number 04893799AJ. This proactive measure, dated 8-April-2026, aims to ensure that only approved components are used in the assembly and servicing of vehicles. The QIR, identified by NHTSA ID 11031481, provides clear instructions for dealers to identify and manage potentially suspect parts within their inventory.

This inspection is crucial for maintaining the quality and reliability of engine components. The integrity of the cylinder head cover is vital for proper engine function, and this QIR addresses a potential manufacturing variation in the bolts that secure it. The 2024 Jeep Wrangler cylinder head bolt issue, as addressed by this QIR, highlights the importance of precise manufacturing and part identification in the automotive supply chain.

Identifying Suspect Bolts

The core of this Quality Inspection Request is the visual distinction between acceptable and suspect cylinder head cover bolts. Dealers must carefully examine the flange design of part number 04893799AJ to determine its status. The QIR provides clear photographic examples to aid in this identification process.

• Good parts: These are described as "Bolts with flat ended flange are good and can be used for sales." The accompanying image clearly shows a bolt where the flange, the circular collar beneath the bolt head, has a distinct, flat, and perpendicular edge where it meets the bolt shaft. This design ensures proper seating and clamping force when installed.

• Suspect parts: These are identified as "Bolts with chamfer to the flange are suspect and must be quarantined." The corresponding image illustrates a bolt where the flange transitions to the bolt shaft with a noticeable angled cut or chamfer. This chamfered edge prevents the flange from sitting flush against the mating surface, potentially compromising the clamping force and sealing capability of the cylinder head cover. This visual difference is critical for proper identification and adherence to the QIR, ensuring that only correctly manufactured bolts are used in vehicles.

Dealer Instructions and Actions Required

Dealers who have been identified as having stock on hand or in transit for part number 04893799AJ must take immediate action. The instructions are clear and specific, emphasizing the need to prevent the use of suspect parts in any vehicle, including models like the 2024 Jeep Wrangler.

1. Check Stock: Dealers must thoroughly check their current inventory, including parts shelves and incoming shipments, for any units of part number 04893799AJ. This includes both new stock and any parts currently in the process of being used for service or assembly.

2. Quarantine Suspect Parts: Any bolts identified as "suspect part - Bolts with chamfer to the flange" must be quarantined immediately. This means segregating them from usable inventory to prevent their accidental installation in vehicles. The purpose of quarantining is to ensure these non-conforming parts are removed from the supply chain and do not reach customers.

3. Return Procedure: All suspect parts must be returned to the facing depot using "Return Code 02" before the deadline of 29th April 2026. This specific return code is essential for proper tracking and disposition of the non-conforming parts. Dealers are advised to follow standard return protocols, ensuring all required documentation is completed.

4. Replacement Orders: For replacement parts that meet the quality specifications, dealers are instructed to place new orders. This indicates that a corrected version of the part is available and should be used for all future installations and sales.

5. Open Orders: Any open orders for the suspect part in process must also be returned. This ensures that even parts already allocated or in transit for specific jobs are checked and replaced if found to be suspect.

For any questions regarding the return process or the QIR itself, dealers are directed to contact [email protected].

Why This Quality Check is Critical

This Quality Inspection Request, identified by NHTSA ID 11031481, underscores Mopar's commitment to vehicle quality and safety. While the specific engineering reasons for the chamfered bolt being suspect are not detailed in the communication, the integrity of cylinder head cover bolts is paramount for engine performance and longevity. Incorrect or substandard fasteners, such as those with a chamfered flange, can lead to various critical issues, including:

• Improper Sealing: A chamfered flange may prevent the bolt from creating a uniform and tight seal, potentially leading to oil leaks from the cylinder head cover. Oil leaks can cause engine damage, reduce lubrication, and pose environmental hazards.
• Reduced Clamping Force: The angled surface of a chamfered flange can reduce the effective clamping force exerted by the bolt, potentially allowing the cylinder head cover to loosen over time. This could lead to vibrations, noise, and further compromise of the engine's integrity.
• Structural Compromise: In severe cases, inadequate clamping force could lead to stress on other engine components or even structural compromise of the cylinder head assembly itself, potentially resulting in costly repairs or engine failure.

By proactively identifying and removing these suspect parts from the supply chain, Mopar aims to prevent potential future problems for owners of the affected 2024-2026 Jeep, Ram, and Dodge vehicles. This includes ensuring the reliability of key components like the 2024 Jeep Wrangler cylinder head bolt. This process ensures that vehicles are built and serviced with components that meet stringent quality standards, contributing to the overall reliability and safety that customers expect from their vehicles.

Source: NHTSA ID: 11031481