What is an engine block? Signs of a cracked engine block and how to repair

K-Seal will fix most engine block leaks and could save you thousands in repair costs. Order yours today to stop your coolant leaking from the engine.

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What is an engine block?

The engine or cylinder block is the key component of an internal combustion engine, where the power to drive the vehicle is generated by igniting a fuel/air mixture to produce an explosion.

Engine Block

How does an engine block work?

The engine block performs several functions, including:

  • Assisting with the pumping of water from the radiator to the different parts of the engine to cool them down.
  • Housing pistons in several cylinders that move the vehicle’s crankshaft.
  • Sealing in the lubricating oil via the oil pan attached to the bottom, and acting as the housing for the various valves, gaskets and seals that work together to keep the engine and the car as a whole running safely.

What causes a cracked engine block?

Heat is the primary enemy of the engine block. If it overheats, the metal will become stressed and will eventually fail, leading to a crack. Discover a few of the main culprits below:

  • The primary culprit of a cracked engine block, often linked to coolant issues, is excess heat. Overheated sections of the engine expand, while cooler areas do not. This places stress on the engine block, causing a crack in the engine to form.
  • Another issue leading to a cracked engine block and still related to excess heat is water pump failure. The failure of a water pump disables proper coolant flow, leading to severe overheating.
  • Casting failure during injection molding can also cause issues with the engine block. If the molding results in thinner sections on the engine block metal, the application of heat to these thinner areas can lead to the formation of engine cracks.

How to identify signs of a cracked engine block

A cracked engine block can cause a range of problems. Ultimately, since the circulation system that cools the engine is comparatively fragile, a cracked engine block will lead to coolant leaking out of the area it is needed and leaving the engine to overheat. If left untreated, this will lead to engine failure and may result in the vehicle having to be written off. 

A cracked engine block can lead to symptoms such as:

  • Discoloration in car oil and antifreeze mixing
  • Leaking oil or coolant
  • Engine overheating caused by leaking antifreeze
  • Low engine compression and poor engine performance
  • Frozen coolant in the car radiator
  • Low levels of coolant
  • Excessive engine smoke
  • Visible crack in the block

How much will an engine block repair cost at a workshop?

A cracked engine block will leave you stranded and, more often than not, facing a huge repair bill (at least $1,200, probably more). 

The cost of repairing a cracked engine block can vary considerably depending on the workshop you visit, the severity of the crack and the car you drive. The technique used to repair the crack can also affect the total and you may have to weigh up the sense in repairing it when it may be more cost-effective to buy a new engine or even a new car. However, if the damage isn’t too severe, K-Seal may be able to repair the cracked engine block without costing you thousands.

Can K-Seal fix my Engine Block?

K-Seal and K-Seal HD will permanently repair most engine block failures including:

  • Engine coolant leaks
  • Cracked engine blocks
  • Porous blocks
  • Core plug or freeze plug failure

With a replacement block costing thousands, it’s well worth trying to fix the problem with K-Seal before going down this route. K-Seal will seal the cracks in engine blocks that cause coolant leaks, to get you back on the road and save you a small fortune.

Want to get hold of a bottle to fix your engine block? Use our simple stockist search and get back on the road – fast.

Could Other Parts of My Engine Be Affected?

Although your engine block could be the source of your engine troubles, it might not be the only component you need to take a look at. Select an engine part in the interactive diagram below to explore your engine and the important components that keep everything ticking over.

Click on the engine components below for details
More Info »

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