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(7) Inspect and clean manifold. (Refer to 9 - ENGINE/MANIFOLDS/EXHAUST MANIFOLD - INSPECTION) (Refer to 9 - ENGINE/MANIFOLDS/ CLEANING (1) Discard gasket (if equipped) and clean all sur- faces of manifold and cylinder head. INSPECTION Inspect exhaust manifolds for damage or cracks and check distortion of the cylinder head mounting Manifold surface flatness limits should not exceed 1.0 mm (0.039 in.). INSTALLATION (1) Position exhaust manifold on cylinder head (Fig. 134). Install bolts to center runner (cylinder #4) (2) Using a new gasket, attach crossover pipe to exhaust manifold and tighten bolts to 41 N·m (30 ft. NOTE: Inspect crossover pipe fasteners for damage (3) Position heat shield on manifold (Fig. 134). Tighten all bolts to 23 N·m (200 in. lbs.). (5) Install and tighten heat shield attaching nut to 12 N·m (105 in. lbs.) (Fig. 134). (6) Connect battery negative cable. VALVE TIMING STANDARD PROCEDURE STANDARD PROCEDURE - VALVE TIMING (1) Remove front cylinder head cover and all 6 spark plugs. (2) Rotate engine until the #2 piston is at TDC of the compression stroke. (3) Install a degree wheel on the crankshaft pulley. into #2 spark plug hole. Using the indicator find TDC (5) Position the degree wheel to zero. valve stem tip of #2 intake valve and rocker arm pad. (8) Install a dial indicator so plunger contacts the #2 intake valve spring retainer as nearly perpendic- (9) Rotate the engine clockwise until the intake valve has lifted .254 mm (0.010 in.). CAUTION: Do not turn crankshaft any further clock- (10) Degree wheel should read 6 degrees BTDC to 6 degrees ATDC. STANDARD PROCEDURE - MEASURING NOTE: This procedure must be performed with the (1) Position a scale next to timing chain so that any movement of chain may be measured (Fig. 136). (2) Position a torque wrench and socket on the camshaft sprocket attaching bolt. Apply force in the • 41 N·m (30 ft. lb.) with cylinder heads installed • 20 N·m (15 ft. lb.) with cylinder heads removed NOTE: With torque applied to the camshaft sprocket bolt, crankshaft should not be permitted to Fig. 135 Check Exhaust Manifold Mounting 1 - STRAIGHT EDGE RS ENGINE 3.3/3.8L 9 - 157 EXHAUST MANIFOLD - LEFT (Continued) |