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2C-18 Chapter 2 Part C General engine overhaul procedures 17.8 All bolt holes in the block, particularly the main bearing cap and head bolt holes, should be cleaned and restored with the appropriate tap (be sure to remove the debris from the holes after this operation) 2 Using a gasket scraper, remove all traces of gasket material from the engine block. Be very careful not to nick or gouge the gasket sealing surfaces. 3 Remove the main bearing cap assembly and separate the bearing inserts from the bearings are equipped with the oil groove and cylinder they were removed from, then set them aside. 4 Remove all of the threaded oil gallery plugs from the block. The plugs are usually If the engine is extremely dirty it should be taken to an automotive machine shop for After the block is returned, clean all oil holes and oil galleries one more time. If the block isn't extremely dirty or slugged up, you can do an adequate cleaning The threaded holes in the block must be clean to ensure accurate torque readings 17.10 A large 1/2 drive socket on an extension can be used to drive the new core plugs into the block damaged threads (see illustration). If possi- Reinstall the bearing inserts in their cor- rect locations and place the main bearing cap 10 After coating the sealing surfaces of the new core plugs with Permatex No. 2 sealant (or equivalent), install them in the engine block (see illustration). Make sure they're driven in straight and seated properly or leak- hammer will work just as well. Apply non-hardening sealant (such as Permatex No. 2 or Teflon pipe sealant) to the <—CENTERLINE OF ENGINE---> 18.4a Measure the diameter of each cylinder at a right angle to the engine centerline (A) and parallel to the engine centerline (B) - the cylinder out-of-round cylinder taper is the difference between (A) and (B) at the bottom of the cylinder new oil gallery plugs and thread them into the ened securely. 12 If the engine isn't going to be reassem- trash bag to keep it clean. 18 Engine block - inspection Refer to illustrations 18.4a, 18.4b. 18.4c, 18.4d and 18.8 Before the block is inspected, it must be cleaned as described in Section 17. Visually check the block for cracks, rust and corrosion. Look for stripped threads in the threaded holes. It's also a good idea to have the block checked for hidden cracks by block requires machining, be sure to send the 3 Check the cylinder bores for scuffing and scoring. Check the cylinders for taper and out- of-round conditions as follows (see illustra- tions): 18.4b Measure the diameter of each cylinder just under the wear ridge (A), at the center (B) and the bottom (C) 18.4c The ability to "feel" when the telescoping gauge is at the correct point will be developed over time, so work slowly and repeat the check until you're satisfied that the measurement is accurate |