33. Engine Block Clean and Inspect

You will need a solvent tank large enough to hold the large engine parts, along with various bristle brushes and a gasket scraper. Whenever you are using cleaning solvents for cleaning parts, follow the manufacturer's recommendations. If necessary, wear protective clothing. A source of compressed air will be helpful in the cleaning operations. Wear safety glasses throughout the cleaning, inspection, and repair process.
The inspection procedure requires precision measuring tools. These include micrometers, cylinder bore gauge, feeler gauges, dial indicator set, etc. Perform the inspection work with the proper method and tools. Using parts worn beyond the acceptable limits will decrease the performance of the rebuilt engine.

1. Clean the block in the cleaning solvent.
2. Clean the block gasket surfaces.
3. Clean the cylinder bores.
4. Clean the oil galleries and passages.
5. Clean the scale deposits from the coolant passages.
6. Inspect the valve lifter bores for deep scratches and varnish deposits.
7. Inspect the block for cracks. Use the Magnaflux Spot check dye method, or the equivalent.
^ Inspect the cylinder walls.
^ Inspect the coolant jackets.
^ Inspect the crankshaft bearing webs.
8. Inspect the crankshaft bearing bores and caps. All crankshaft bearing bores' inside diameters should be round and uniform at all the bearing supports.
9. Inspect the area where the crankshaft bearing inserts contact the crankshaft bearing bore. This area must be free of burrs and scratches.
10. Inspect the engine mount bosses.
11. Inspect the cylinder head gasket mating surfaces for pitting.
12. Inspect the engine block to cylinder head gasket surface area for warping. Use a straight edge and feeler gauge. Replace the block if it is warped more than 0.15 mm (0.006 inch) longitudinally or more than 0.08 mm (0.003 inch) transversely.
13. Inspect the camshaft bearings. Replace the camshaft bearings if any of the following conditions exist:
^ Scratches
^ Pits
^ Loose fit in their bores
14. Inspect the camshaft bearings inside diameter using an inside micrometer. Refer to Specifications. If the bearings are worn beyond specification, replace the bearings.