How to Repair a Cracked Engine Block

Published on November 3, 2020

Search More Research Explaining Mechanic Jobs, Remove Car Scratch, DIY Cars, Repair Shop, and Car Engine Block Repair, How to Repair a Cracked Engine Block.

A #crackedengineblock in a vehicle is not uncommon and certainly does not mean the end of the engine’s lifespan. There are various methods of repairing cracked engine blocks: from welding and brazing, to cold metal stitching. In this short video, you will learn how to repair a cracked engine block using Belzona in less than an hour.

Cracked engine blocks can lead to problems such as leaking cooling water so for that reason they need to be repaired. Belzona offers a solution that does not require hot work or specialist tools and is proven to provide a long-lasting alternative to costly replacement.

Materials Used:
To repair this cracked engine block, we used #Belzona1111 (Super Metal), Belzona 9111 (Cleaner/Degreaser), Belzona 9341 (Reinforcement Tape) along with a few tools from our machine shop. For more information, please visit

Read more about this repair on our Blog:

How-To Guide:
Step 1: Before starting work on the repair, make sure the damaged area is thoroughly cleaned and free of grease, oil and dirt. We recommend the use of Belzona 9111 and a stiff bristle brush to remove all the surface contaminants.
Step 2: Terminate all cracks by drilling holes along the length of the cracks and at both ends. This helps to prevent crack propagation.
Step 3: Insert studs into holes and using a grinder, cut all the studs flush with the casing.
Step 4: ‘Vee’ out all the cracks with a hand-held machine fitted with a cutting disc and roughen the entire repair area to ensure excellent adhesion of the Belzona repair material.
Step 5: Once again, clean and degrease the repair area and apply masking tape to the area to be repaired.
Step 6: Measure and cut a piece of Belzona 9341 to the size of the masked off repair area.
Step 7: Mix the appropriate amount of Belzona 1111 making sure to achieve a uniform material (Learn more about mixing and applying Belzona 1111 (Super Metal) here:
Step 8: Apply a thin layer of Belzona 1111 to the prepared surfaces pressing firmly with a stiff bristled brush to ensure full contact with the surface.
Step 9: Wet out the Belzona 9341 with the mixed Belzona material and bed it down over the crack into the layer of Belzona already applied using an applicator.
Step 10: Apply another layer of Belzona material to create a buildup of approximately 1/8th inch (3mm) over the entire area.
Step 11: Remove the masking tape and leave the repair to cure. After the product is fully cured, the engine is ready to be put back to service!

To find your local Belzona products and services supplier please visit:

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How to Repair a Cracked Engine Block

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