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length of cylinder block at several points. If warpage exceeds specifications, deck must be resurfaced. If warpage exceeds manufacturer’s maximum tolerance for material removal, replace block. DECK HEIGHT Distance from the crankshaft centerline to the block deck is termed the deck height. Measure and record front and rear main journals of crankshaft. To compute this distance, install crankshaft and retain with center main bearing and cap only. Measure distance from the crankshaft journal to the block deck, parallel to the cylinder centerline. Add one half of the main bearing journal diameter to distance from crankshaft journal to block deck. This dimension should be checked at front and rear of cylinder block. Both readings should be the same. If difference exceeds specifications, cylinder block must be repaired or replaced. Deck height and warpage should be corrected at the same time. MAIN BEARING BORE & ALIGNMENT For checking main bearing bore, remove all bearings from cylinder block and main bearing caps. Install main bearing caps in original location. Tighten bolts to specification. Using inside micrometer, measure main bearing bore in 2 areas 90 degrees apart. Determine bore size and out-of-round. If diameter is not within specification, block must be align-bored. For checking alignment, place a straightedge along centerline of main bearing saddles. Check for clearance between straightedge and main bearing saddles. Block must be align-bored if clearance is present. EXPANSION PLUG REMOVAL & INSTALLATION Removal Drill a hole in the center of expansion plug. Remove with screwdriver or punch. Use care not to damage sealing surface. Installation Ensure sealing surface is free of burrs. Coat expansion plug with sealer. Use a wooden dowel or pipe of slightly smaller diameter, install expansion plug. Ensure expansion plug is evenly located. OIL GALLERY PLUG REMOVAL & INSTALLATION Removal Remove threaded oil gallery plugs using the appropriate wrench. Soft, press-in plugs are removed by drilling into plug and installing a sheet metal screw. Remove plug with slide hammer or pliers. Installation Ensure threads or sealing surface is clean. Coat threaded oil gallery plugs with sealer and install. Replacement soft press-in plugs are driven in place with a hammer and drift. CAMSHAFT * PLEASE READ THIS FIRST * |