2019 - 2024 BMW Z4 Cylinder Head (OEM)

What to Look For When Buying:

• Check for cracks, especially around the valve seats and spark plug holes.
• Inspect the surface for warping or damage.
• Ensure the threads for the spark plugs and exhaust manifold are in good condition.
• Look for signs of previous repairs or welding.

Quality Indicators:

What's Typically Included:

The cylinder head itself is usually included. Depending on the seller, it may also include:

• Valves
• Valve springs
• Valve retainers
• Valve seals
• Camshafts (sometimes)

Always confirm exactly what is included before purchasing.

Difficulty Level and Estimated Time:

Replacing a cylinder head is a difficult job best left to experienced mechanics.

• Difficulty: Advanced
• Estimated Time: 8-16 hours (depending on experience and vehicle)

Special Tools Needed:

• Torque wrench
• Head bolt angle meter
• Valve spring compressor
• Timing tools (specific to the engine)
• Gasket scraper
• Cleaning supplies

Critical Steps and Tips:

1. Preparation: Disconnect the battery and drain the coolant and oil.
2. Removal: Carefully remove all components attached to the cylinder head, including the intake manifold, exhaust manifold, and wiring harnesses.
3. Disassembly: If reusing components, carefully remove the valves, springs, and other parts from the old cylinder head.
4. Cleaning: Thoroughly clean the engine block surface and the new cylinder head.
5. Installation: Install the new cylinder head with a new head gasket, following the manufacturer's torque specifications and sequence.
6. Reassembly: Reinstall all components in the reverse order of removal.
7. Timing: Ensure the engine timing is correct.
8. Fluids: Refill the coolant and oil.

DIY or Professional Installation:

Professional installation is highly recommended due to the complexity and precision required. Incorrect installation can lead to serious engine damage.

Used OEM:

Used OEM cylinder heads offer excellent value. These are genuine factory parts that have been tested and inspected. They provide the reliability of an original part at a significantly lower price than new.

Refurbished OEM:

Refurbished OEM cylinder heads are factory parts that have been professionally restored. They are disassembled, cleaned, inspected, and rebuilt with new components as needed. This option offers a balance of quality and cost.

New Aftermarket:

New aftermarket cylinder heads are brand new parts manufactured by third-party companies. They are designed to meet or exceed OE specifications. Quality can vary, so research the manufacturer carefully.

Parts Commonly Replaced or Checked:

• Head gasket
• Head bolts
• Timing chain or belt
• Water pump
• Thermostat
• Valve cover gasket
• Intake manifold gasket
• Exhaust manifold gasket

Preventing Repeat Failures:

Replacing related parts can prevent future problems. For example, a worn water pump can cause overheating, which can damage the cylinder head. Replacing the water pump at the same time as the cylinder head ensures proper cooling and prevents repeat failures.

How Long This Part Normally Lasts:

A cylinder head can last for 150,000 to 200,000 miles or more with proper maintenance.

Factors That Affect Longevity:

• Regular coolant changes
• Proper engine oil maintenance
• Avoiding overheating
• Using high-quality fuel
• Avoiding aggressive driving

Budget vs. Mid-Range vs. Premium Options:

• Used OEM: $300 - $700
• Refurbished OEM: $500 - $1000
• New Aftermarket: $600 - $1200

Labor Cost Considerations:

Labor costs for cylinder head replacement can range from $800 to $2000, depending on the shop and the complexity of the job.

Total Job Cost Estimates:

• Used OEM: $1100 - $2700
• Refurbished OEM: $1300 - $3000
• New Aftermarket: $1400 - $3200

The 2017-2024 BMW and Toyota engines (specifically those using this cylinder head) are known for potential issues with coolant leaks. Regularly check coolant levels and inspect for any signs of leaks around the cylinder head and water pump. Some owners have reported issues with the head gasket failing prematurely, leading to coolant entering the cylinders. Addressing cooling system issues promptly can help prevent cylinder head damage.

How to Confirm Proper Operation:

• Check for any leaks (coolant, oil, exhaust).
• Monitor engine temperature to ensure it's within the normal range.
• Listen for any unusual noises (knocking, hissing).
• Check the exhaust for white smoke.
• Use an OBD-II scanner to check for any error codes.

What to Look/Listen For:

• Smooth engine running
• No overheating
• No coolant leaks
• No unusual noises
• Normal exhaust color

Q: How do I know if my cylinder head is cracked?
A: Common signs include overheating, white smoke from the exhaust, coolant loss, and milky oil. A cylinder leak-down test can confirm a crack.

Q: Can I replace just one cylinder head, or do I need to do both?
A: If your engine has two cylinder heads, you only need to replace the damaged one. However, it's a good idea to inspect the other head for any potential issues.

Q: What kind of coolant should I use after replacing the cylinder head?
A: Use the coolant specified in your vehicle's owner's manual. Using the wrong coolant can cause corrosion and damage to the cooling system.

Q: How important is it to torque the head bolts correctly?
A: It's extremely important. Incorrect torque can lead to leaks, warping, and engine damage. Always follow the manufacturer's torque specifications and sequence.

Q: How long will a used OEM cylinder head last?
A: A used OEM cylinder head can last for many years if it's in good condition and properly maintained. Its lifespan will depend on its previous usage and how well it's cared for after installation.

OEM Part Numbers:

• BMW: 11121019167, 11127934493

Fits Years: 2019 2020 2021 2022 2023 2024