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2B-14 Chapter 2 Part B V6 engine STRETCHED BOLT UNSTRETCHED BOLT 12.18 Place a precision straightedge along the cylinder head bolt thread profile as shown, if any part of the bolt threads are not on the straightedge, the bolt is stretched and must be replaced 12.19a Checking the cylinder head-to-engine block gasket surface for warpage 12.19b Checking the engine block head gasket surface for warpage 12.22 When installing the head gasket onto the block, make sure all passages in the block align with the holes in the gasket ing and tapping the wood with a hammer or fully on a casting protrusion. Note: If further 17 Remove all traces of old gasket material from the block and head. Special gasket removal solvents that soften gaskets and is aluminum, be very careful not to gouge the sealing surfaces. When working on the block, place clean shop rags into the cylinders to threads in the engine block. Clean and inspect all threaded fasteners for damage. for "necking," where the diameter of threads 19 Using a precision straightedge and feeler gauge, check all gasket surfaces for Refer to Part C of this Chapter for clean- ing and inspection of the cylinder head. 12.23 Install the head bolt washers as shown Installation Refer to illustrations 12.22, 12.23 and 12.24 21 Install the camshaft(s) if removed (see Section 10). Place a new gasket on the engine block (see illustration). Use no sealer unless indi- 23 Install the washers onto the cylinder head bolts as shown (see illustration). Apply clean engine oil to the cylinder head bolt head. 24 Tighten the cylinder head bolts in the sequence shown (see illustration) progress- 12.24 Cylinder head bolt TIGHTENING sequence ing in three stages to the torque listed in this The remaining installation steps are the reverse of removal. Refill the cooling system and check all fluid levels (see Chapter 1 if necessary). 27 Start the engine and let it run until nor- mal operating temperature is reached. Check for leaks and proper operation. |