Underneath the valve cover, you’ll find a valve cover gasket between the cover and the cylinder head. The gasket is there to prevent oil from seeping out. The cylinder head subjects the gasket to a lot of heat. Heat can cause the gasket to become brittle and crack or shrink over time. As a result, the gasket fails to do its job, and oil leaks out.
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A valve cover gasket leak is pretty serious. The bigger the leak, the faster the engine loses oil. If this goes on for too long, the engine won't be properly lubricated and may suffer engine damage. So it's best to fix the leak right away.
The best and most thorough way to diagnose a leaking valve cover gasket is to look over the whole perimeter of the valve cover and gasket from the top.
To help make this process easier for you, we put together a step-by-step guide on doing this.
Sometimes the valve cover gasket is intact and firmly in place, but the valve cover itself is damaged. When you have a cracked or loose valve cover, the oil will leak out just like with a broken gasket.
How can you confirm that the valve cover is the problem, though?
It’s easy to see the valve cover from the top. So if you see oil leaking out from above the gasket area, then chances are high that the valve cover is cracked or loose. You just have to pinpoint the location of the leak on the cover.
If you can't pinpoint the leak, wash the engine, let it dry, and repeat the process.
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If you found a leak in the valve cover or the valve cover gasket (or both), the part needs to be replaced right away. You have two options:
Having a dealership replace the part for you is obviously the more expensive option. You would have to pay them $100 per hour (give or take) and a markup of about 30% for the replacement part. If you ask us, it’s not worth the extra cost. Replacing your valve cover and/or valve cover gasket is so easy a novice could do it. To see what we mean, here's a tutorial on replacing a valve cover gasket on a Chevy Colorado. Also, you can save a bunch of money by ordering a genuine OEM replacement part from a trustworthy online seller.
Some online sellers mark up their prices, though, so you’ll need to find one that offers low prices. You don’t need to look far, because you can find deep discounts right on our website. A few examples:
To see our entire catalogs of valve covers, valve cover gaskets, and other valve parts, visit GMPartsCenter.net here.