A Common Issue in CX-5’s and How We Fix It

If you own a Mazda CX-5 2.2L diesel, you may have heard about or experienced issues with head gasket failure. This engine, known internally as the SH or Skyactiv-D 2.2, is powerful and fuel-efficient, but it’s also prone to a few key issues that can cause major damage if not caught early. One of the most common (and serious) problems? A failing head gasket.

At All Aspects Motors, we regularly perform head gasket replacements on these engines. In this article, we’ll walk through the common symptoms, why this happens so frequently in the CX-5 diesel, and what our repair process involves.

Why Head Gaskets Fail in the CX-5 2.2 Diesel

There are a few known weaknesses in this engine platform that contribute to premature head gasket failure:

• Aluminium head expansion: High operating temperatures and alloy expansion can cause the head gasket to wear or fail prematurely.
• Carbon buildup and injector sealing issues: When injectors leak or combustion gases escape past the sealing washer, pressure increases in the cylinder and damages the gasket.
• Deteriorated coolant: Missed cooling system maintenance or improper coolant mixtures can lead to hot spots in the head.

These factors combine to create stress points around the gasket area, leading to blow-by, coolant loss, or combustion gases entering the cooling system.

Read more: 7 Different Ways a Head Gasket Can Fail

Symptoms of a Failing Head Gasket in the CX-5 Diesel

• Coolant loss with no visible leak
• White smoke from the exhaust
• Overheating under load
• Hard starting or misfires, especially when cold
• Bubbling or pressure build-up in the overflow tank
• Milky residue under the oil cap

If you’re experiencing any of these, your engine may already have a compromised gasket. Left unresolved, this can quickly lead to further engine damage, including cracked heads, warped blocks, or failed turbos.

The Repair Process at All Aspects Motors

We recently carried out a full head gasket replacement on a CX-5 2.2L diesel that was losing coolant and showing signs of combustion gases in the radiator. Here’s a breakdown of what the job involved:

1. Engine removal: Due to the transverse layout and tight bay, we removed the engine for better access.
2. Cylinder head inspection: We pressure tested and checked for warpage, which was within spec.
3. Gasket surface prep: All gasket faces were cleaned thoroughly and measured for flatness.
4. New gasket and head bolts: Installed a high-quality OEM-spec multi-layer steel gasket and new stretch bolts.
5. Injector reseating and seal replacement: This is crucial to prevent repeat issues.
6. Reassembly with timing and EGR system checks
7. Coolant system flush and pressure test
8. Road testing and reinspection after heat cycling

Our team also advised the customer to monitor oil levels and coolant for the next few weeks. A follow-up inspection showed everything running perfectly.

Why Choose All Aspects Motors?

• Diesel engine specialists experienced with Mazda’s 2.2L platform
• Proper diagnosis using combustion leak detection and pressure testing
• OEM parts and precise torque specs for reliable long-term repair
• Transparent quotes and honest advice

We’re not about patching problems – we fix them properly the first time. You can view our full list of services here.

Book Your Mazda CX-5 Diesel Inspection

If your Mazda CX-5 is overheating, losing coolant, or showing signs of head gasket trouble, don’t wait. Book in with the team at All Aspects Motors today.

We’ll provide an accurate diagnosis and walk you through your repair options.

All Aspects Motors – Precision engine repairs, trusted by Perth drivers.