Engine Block Preparation for Assembly | Engine Assembly | Automotive Engine | Engine Service

Block Cleaning

After the cylinders have been honed and before the block is cleaned, use a sandpaper cone to chamfer the top edge of the cylinder. Cleaning the honed cylinder wall is an important part of the honing process. If any grit remains on the cylinder wall, it will rapidly wear the piston rings. This wear will cause premature failure of the reconditioning job. Degreasing and decarburizing procedures will only remove the honing oil but will not remove the abrasive. The best way to clean the honed cylinders is to scrub the cylinder wall with a brush using a mixture of soap or detergent and water. The block is scrubbed until it is clean. This can be determined by wiping the cylinder wall with a clean lint free cloth. The cloth will pick up no soil when the cylinder wall is clean. Be sure that the cylinders are dried as soon as possible to avoid rust from forming.

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Fig.1 Notice on this cutaeway engine block that some of the head bolt holes do not extend too far into the block and dead end. Debris can accumulate at the bottom of these holes and it must be cleaned out before final assembly.

Block Detailing

Before the engine block being assembled, a final detailed cleaning should be performed.

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Fig.2 A tread chaser or bottoming tap should be used in all threaded holes before assembling the engine.

1. All oil passages (galleries) should be cleaned by running a long bottle-type brush through all holes in the block.

2. All tapped holes should have the sharp edges at the top of the holes removed chamfered) and cleaned with the correct size of thread chaser to remove any dirt and burrs. ‚óŹ SEE FIGURES 1 and 2.

3. Coat the newly cleaned block with fogging oil to prevent rust. Cover the block with a large plastic bag to keep out dirt until it is time to assemble the engine.




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