Chevrolet 19418950 Exhaust Manifold

To remove the exhaust manifold, start by unscrewing the cable of the battery's negative terminal and lift the auto, placing it on stands. The exhaust pipe to manifold studs and nuts must also be lubed with penetrating oil while you work beneath and allow the oil to soak before trying to remove the nuts. Subsequently, pull the oxygen sensor out of the way and take out the nuts for the heat shield, und then the heat shield. Remove the exhaust manifold by using nut and bolt and then cleaning the sealing surfaces in the cylinder head and the manifold. When installing the manifold check for cracks on the manifold and at the same time check and clean the bolt threads using a gasket scraper to remove carbon deposits. For greater accuracy check for warpage using a straightedge and feeler gauges then either resurface or replace the manifold as required. Place a new gasket on the cylinder head and then place the manifold on the head, add heat resistant lock on the bolts and turn the bolts by hand. Re-tighten the bolting in three goes from an inner circle in a spiraling sequence to the recommended torque level. Lastly rev up the engine and look as well as listen to the pipes for any kind of leakage.