Engine Rebuilding-Automotive Machine Shop-High Performance & Hot Rod
Engine Block Line Honing & Align Honing
475 West Street Walpole MA 02081 Phone : 508-734-0053
     Engine Rebuilding-Automotive Machine Shop-High Performance & Hot Rod Engines

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Alignment Checks

The alignment of the crankshaft and camshaft bores in blocks can be checked by placing a straight edge in the bores or along the bore parting lines and using a feeler gauge to check for misalignment.

How much misalignment is too much? It depends on the engine and the application. A light duty passenger car engine is not as critical as a high revving performance engine or a hard-working diesel engine. As a rule, most passenger car and light truck engines call for .002" or less of misalignment between all the bores, and .001" or less misalignment between adjacent main bores. For performance engines, you can reduce these maximum tolerances by half or more.

Another dimension to look at is bore wear. Bore diameters should usually be within .001" of specifications to support the bearings properly, with no more than .001" out-of-roundness if the horizontal dimension is greater than the vertical dimension.

Also check for wear on the thrust bearing surface of the main cap. If worn or damaged, this surface should also be remachined.

Align Honing Sunnen CH100

With main bearings, a worn, out-of-round or damaged bore can be restored back to standard ID by grinding or milling the mounting surface of the main caps, bolting the caps back on the block, and then line honing to their original dimensions.