Hummer 12620308 Manifold, Intake

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To start with, disconnect the cable from the battery's negative terminal prior to eliminating the intake manifold. Also, drain coolant and remove ignition coil as well as EVAP canister tube. In addition, sever heater hoses; throttle body wiring, and numerous electrical connectors. Moreover, get rid of PCV valve hose; power brake booster hose, and radiator hose. Furthermore, drop water pump intake hose together with drivebelt. And then, release power steering pump bracket nut and bolts. Finally, shift power steering pump bracket forward in order to reach the bolt at front of intake manifold. Therefore, remove intake lower manifold mounting bolts and pry up manifold to break gasket seal. Eventually loosen all connections attaching the intake manifold while ensuring nothing is still attached. For installation purposes: clean mating surfaces and tap thread in bolt holes; apply RTV sealant on front and rear manifolds' mating surfaces plus a thin ring around new intake manifold gaskets' cylinder head side coolant passage holes; place gaskets accordingly while sealant is still wet then set the manifold in position; install bolts eventually following recommended sequence; finally perform remaining tasks in reversed manner fill cooling system again and check for leaks at joints between intake manifolds.

To finish the installation process, the removal steps should be reversed, the engine should be started, and vacuum leaks at the intake manifold joints should be checked for.

RTV sealant should be applied to the front and rear manifold mating surfaces.

Before installing the intake manifold, the gasket surfaces should be cleaned thoroughly, avoiding aggressive scraping that can damage sealing surfaces, and wiped with safety solvent.

After installing the intake manifold, you should tighten the bolts following the recommended sequence and complete the remaining steps in reverse order.

The initial steps are to disconnect the negative battery cable and relieve fuel system pressure.

The water pump intake hose and drivebelt should also be removed.

The power steering pump bracket can be accessed by loosening and removing the power steering pump bracket nut and bolts, and sliding the bracket forward.

Before installing the intake manifold, the gasket surfaces should be cleaned thoroughly, avoiding aggressive scraping that can damage sealing surfaces, and wiped with safety solvent.

The intake manifold should be lifted and removed while checking for any remaining attachments.

After the installation, you should refill the cooling system and check for leaks at the intake manifold joints.

The air filter housing outlet duct and the alternator need to be removed.

Yes, this is considered the cathedral port manifold