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(3) Check cylinder head for flatness (Fig. 29). inch.) • Service Limit = 0.2 mm (0.008 inch.) • Grinding Limit = Maximum of 0.2 mm (0.008 inch.) is permitted. CAUTION: 0.20 mm (0.008 in.) MAX is a combined INSTALLATION - CYLINDER HEAD (1) Clean all sealing surfaces of engine block and cylinder heads. (Refer to 9 - ENGINE - STANDARD (2) Position new gasket(s) on engine block (Fig. 30). The left bank gasket is identified with the “L” (3) The cylinder head bolts are torqued using the torque yield method, they should be exam- (4) Necking can be checked by holding a scale or straight edge against the threads. If all the threads (5) Tighten the cylinder head bolts 1–8 in the sequence shown in (Fig. 32). Using the 4 step torque • Step 1: Bolts 1 – 8 to 61 N·m (45 ft. lbs.) • Step 2: Bolts 1 – 8 to 88 N·m (65 ft. lbs.) • Step 3: Bolts 1 – 8 (again) to 88 N·m (65 ft. lbs.) • Step 4: Bolts 1 – 8 turn an additional 1/4 Turn. (Do not use a torque wrench for this step.) NOTE: Bolt torque after 1/4 turn should be over 122 (6) Inspect and replace worn or bent push rods. Fig. 29 Checking Cylinder Head Flatness—Typical Fig. 30 CYLINDER HEAD GASKET 1 - CYLINDER HEAD GASKET Fig. 31 Check for Stretched Bolts 1 - STRETCHED BOLT Fig. 32 CYLINDER HEAD TIGHTENING SEQ CS ENGINE 3.8L 9 - 139 CYLINDER HEAD (Continued) |