How to Use Cylinder Head Sealant

It's easy to fix your cylinder head with a sealant or sealer. Otherwise, to err on the side of caution, they should have a mechanic do it for them.

The cylinder head is a car part you can see sitting on top of the engine block. It's responsible for creating the combustion chamber by closing the cylinder's top.

The head and the block require a head gasket in order to seal the gap between them. It usually supplies air and fuel to the cylinder then removes exhaust through its passages.

Is your cylinder head damaged? Use the cylinder head or engine block sealant to repair it. 

How to Fix Your Cylinder Head with a Sealer

  • What You'll Need and Radiator Flush: This is a relatively easy task. All you need are a fresh bottle of antifreeze, a bucket or drain pan, a $3 flushing agent, and the cylinder head sealant itself. First off, drain the radiator's supply of antifreeze using the drain pan or bucket. After that's over, flush the system. Don't pour the sealant just yet without doing a radiator flush.
  • Inspect The Coolant's Health: How healthy is your coolant? Visually inspect it. If it's dark brown, it needs cleanup because your car hasn't been flushed for quite a while. To do the flush, get the flushing agent and follow the instructions on the kit box or bottle. After you're done with that, make sure the engine has cooled down before adding water to it. The engine should have enough room for the additive.
  • Head Gasket Sealant Application: It's at this point that you can apply sealant on your head gasket. First thing's first, though; look for the cracks, leaks, and gaps on your gasket before applying the sealant so that you won't waste the product on areas that aren't even cracked or broken in the first place. Shake the bottle, pour it, and let it dry.
  • Bleeding the Air from the System: Bleeding the air from the system is something that enables you to further fix your faulty head gasket after it's been sealed. It involves removing the radiator cap, opening the bleeder valves, and running your engine until its warm. Keep topping off your engine with water until its full then put back the cap. Let the car run on idle for half an hour.
  • Flush, Drain, Repeat: Some sealants don't only require you to bleed the system but also have you drive for several miles while leaving the product on your topped-off, water-filled engine. At any rate, drain all water and sealant after leaving them in your car. Leave the orifices open as you allow your car to dry for 24 hours. Flush everything down again with water and then drain it. Now you can fill the radiator with a coolant-and-water mix after that last drain. Some sealers should be left on your vehicle for a week.

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