Also, remember that this job requires the bolts to be tightened to the proper specification, so your customer will need to rent or purchase the correct torque wrench. Magazine Current Issue Past Issues.
Connect with us. Advertise Subscribe Contact Us. Check The Part! By Josh Cable. Combustion problems also can cause head-gasket failure. Regardless of why a head gasket has failed, you should recommend a replacement gasket that offers OE form, fit and function.
Despite the hassle involved with changing the head gasket, the long term advantages of doing so could be enormous, potentially saving your car from the scrapyard. It can be a complete lottery in terms of where failures on the gasket occur and therefore the range of potential damage is fairly extreme. So check your oil, check your coolant and always allow your engine to warm up before a hoon! Please confirm you agree to the use of tracking cookies as outlined in the Cookies Policy.
Sign in or register. Michael Fernie 5 years ago. Remind me later. Share Tweet Email Whatsapp. What does a head gasket do? What happens when it fails? What causes it to fail? Known elegantly as 'mayo', this yellow gunk is formed as hot water and oil mix together due to a gasket leak, an instant giveaway for head gasket failure.
The cause may be battery corrosion the battery is located above the left side of the engine that attacks the outer edge of the head gasket. TTY head bolts stretch when tightened and should not be reused because they may break or fail to maintain torque.
Some head gasket failures can be blamed on the design of the cylinder head and the way it loads the gasket. Advertisement In the case of the Mitsubishi 3. The cracking occurs as a result of metal fatigue caused by the head scrubbing back and forth on the block because the engine has aluminum heads and a cast-iron block.
Aluminum expands at a much higher rate than cast iron, which causes the head surface to move more than the block surface. The fix is to replace the OEM head gasket with an improved and redesigned aftermarket head gasket that has stronger combustion armor, better materials and an anti-friction coating that can handle the movement.
Advertisement On older Toyota 3. Installing a redesigned aftermarket gasket with improved combustion armor and an anti-stick coating should provide a long-lasting fix.
Some aftermarket gasket suppliers now offer MLS replacement head gaskets for older import engines that were originally equipped with composite or graphite head gaskets. The MLS head gaskets are made of several layers of embossed stainless steel and are much stronger than the OEM gaskets that were originally used. Gasket Replacement Tips Replacing a head gasket is a big job, so avoid making any mistakes that could prevent the gasket from sealing properly. Do not use an abrasive pad in a drill to whiz off or clean the head or block surfaces because doing so may also remove metal and create shallow depressions that can prevent a new head gasket from sealing.
If flatness is not within specifications, the head or block will have to be resurfaced. For engines with aluminum heads, flatness should be 0. MLS head gaskets typically require a much smoother finish 20 micro-inches or less than composite head gaskets which can handle up to 50 micro-inches or more. If so, use the type of sealer specified by the manufacturer and follow the application instructions to the letter. If the original head gasket is multi-layer steel, the engine usually has TTY head bolts.
Then clean all of the bolt threads and lightly oil them with engine oil before installation. Dirt, thread damage and lack of lubrication can cause false torque readings when the bolts are tightened. A bolt that bottoms out will apply little or no clamping force on the head, which may allow the gasket to leak.
To compensate for resurfacing, you may have to install hardened steel washers under the bolts to raise them up, or use a copper head gasket shim to restore proper head height. Mistakes here can lead to uneven loading that results in a poor seal and leaks.
You may have to start the engine and allow it to warm up to operating temperature, then shut it off, allow it to cool and recheck the coolant level to make sure there are no air pockets.
Make sure the cooling system is functioning normally and holds pressure. And make sure the vehicle owner is using the correct grade of gasoline premium if required. Service: Servicing Custom Wheels. Service: Cavitation: Killer of Water Pumps.
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