- Many businesses produce engine block fillers, but a basic filler consists of a powdered cement base, which the user mixes with water before application. As it hardens, it forms a bond with the engine's wall, improving the block's structural integrity and filling in any internal cracks.
- To make the repair, the prepared filler is poured into the water jacket of the engine block, the spacing in which the engine coolant circulates. The filler should only fill half of the water jacket for passenger cars, allowing enough room within the jacket for the coolant. But, if the vehicle is a race car, Car Craft recommends a tall fill, meaning to fill the entire water jacket with filler, using alternative external systems for cooling the engine.
- Because the filler is applied in the water jacket, using it negatively affects the engine's cooling ability. After a repair with engine block filler, the consumer would need to add an oil cooler to keep the engine's oil at a reasonable, functional temperature.
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