Replace the PCV valve and its hoses, the valve-cover bolts or studs and any grommets, and the spark plug tube seals when you install a new valve cover gasket. Inspect the valve cover for warping or cracks, and replace the oil filler cap gasket and breather components as needed to ensure a lasting seal.
This article examines what extra parts to consider during a valve cover gasket replacement, so you can prevent future leaks and keep the engine breathing cleanly. It covers common wear items, how they affect sealing, and how to decide what to replace based on your vehicle.
What to replace or inspect with a new valve cover gasket
Before you reinstall, consider these parts that often wear or leak and are worth replacing or inspecting.
- PCV valve and hoses or breather: Replace if sticky, cracked, or clogged; many gasket kits include a new PCV valve. A failing PCV can push oil past the gasket and contaminate the intake.
- Valve cover bolts and grommets: Use new bolts or studs and any associated grommets or washers as required by your engine; old hardware can stretch or leak and compromise the seal.
- Spark plug tube seals or O-rings: If your engine uses spark plug tubes sealed by O-rings, replace these seals when you remove the valve cover. Oil in plug wells is a warning sign.
- Valve cover itself (and its sealing surface): Inspect for cracks or warping; if damaged, replace the cover or have the surface properly resurfaced to restore a true seal.
- Camshaft seals (where accessible): Some engines require replacing cam seals when the valve cover is off; this is more common on older or high-mileage engines.
- Oil filler cap and gasket: Replace a worn cap or degraded gasket to prevent leaks at the filler opening.
- Breather element and hoses: If the breather is clogged or the hose is deteriorated, replace to restore proper ventilation and reduce pressure on the gasket.
- Surface cleaning and sealant approach: Thoroughly clean mating surfaces; follow the manufacturer’s guidance on whether to use sealant or RTV in corners where specified.
Concluding: Replacing these components alongside a new valve cover gasket can dramatically reduce future leaks and extend the life of the gasket. However, not every item is required on every engine. Always consult the vehicle’s service manual for model-specific recommendations.
Engine-specific notes
Some modern engines use integrated PCV valves or sealed breather paths, which may have different replacement requirements. In some cases, the gasket kit includes all essential pieces, while in others you buy parts separately. If you are unsure, consult a professional mechanic who can guide you based on your engine code and model year.
Safety and best practices
Always work with the engine off and cooled, disconnect the battery when accessing the valve cover, and use a torque wrench to follow the manufacturer’s specifications for bolt tightness. Work in a clean area, keep small parts organized, and dispose of old gaskets and components properly.
Summary
When replacing a valve cover gasket, plan for additional replacements or inspections of the PCV system, valve-cover hardware, spark plug tube seals, the valve cover itself, oil filler cap, and breather components. A clean mating surface, correct torque, and using the right replacement parts help prevent future leaks and keep the engine ventilated correctly. Always check your specific vehicle manual for model-year guidance and consider professional assistance if you’re unsure about any step.
How much is a new head gasket for a Ford Fiesta?
Car make and model
Our Garage expert reports that head gasket replacement on a Ford Fiesta ranges from £500 to £1,120, depending on the engine type and whether you use a main dealer or independent garage. In contrast, a BMW 3 Series of the same age can cost anywhere from £555 to £2,342.
How much would a mechanic charge to replace a valve cover gasket?
On average, the cost typically ranges from $200 to $600, including parts and labor. However, prices may be higher for luxury or performance vehicles, or if there are complications during the repair process.
What issues would make you replace a valve cover?
5 Warning Signs Your Valve Cover Gasket Needs Replacement
- You Smell Burning Oil. This is often the first sign drivers notice.
- You See Oil Residue on the Valve Cover.
- You Get Dashboard Warnings of Low Oil Levels.
- You See Oil Pooling Underneath Your Car.
- You Hear Misfires or Experience Rough Engine Performance.
Do I need sealant to replace my valve cover gasket?
No need for sealers or adhesives to “glue in” the gasket.