Before servicing or repairing the exhaust manifold, first take off the negative battery cable and elevate the car so you can reach it. Eliminate the nuts and bolts holding the exhaust pipe to the engine exhaust manifold. Next, place the vehicle on a jack stand and deal with the exhaust heat shields. After that, loosen and remove the bolts, nuts and washers attaching the manifold to the cylinder head, then pull off the manifold. Make sure to wipe and blow dry the connector areas on the cylinder head and manifold with solvent and compressed air. Check the manifold for any cracks and make sure the flatness of its mating surfaces is right using a straight edge, so they are no more than 0.2 mm per 300 mm (0.008 in. per foot) out of true. If nuts are removed with studs in them, install additional studs on the ends marked with sealer so they won't leak water. Slide the engine exhaust manifolds onto the cylinder head studs and put conical washers and nuts over them. Insert two bolts and conical washers on the outboard ends of the manifold arms and add two bolts which are bolted without conical washers, to the center arm. Wind all bolts and nuts at the center arm first, then work outward to make sure they're all tightened with 34 Nm (25 ft. lbs.) torque. Place the heat shields in position, lift the car again and attach the exhaust pipe to the manifold, making sure it's tightened with bolts, nuts and retainers to 34 Nm (25 ft. lbs. of torque). Once that's done, lower the vehicle and screw the negative cable back onto the battery.