To remove the head, you should first depressurize the fuel system and isolate the battery. Next, it is important to empty coolant and engine oil by taking off drivebelt, idler pulleys, air filter housing and intake manifolds. To do this you will have to disconnect all wires, vacuum hoses from cylinder heads as well as ignition coils and spark plugs. Removal of catalytic converter(s), valve covers,
Crankshaft Pulley and
Oil Pans is also necessary. Lastly depending upon the cylinder head in question, one may be expected to take out alternator, transmission & oil dipstick tube, air conditioning compressor or heater core tube. Besides removing these parts one must get rid of
Timing Chain cover after rotating the crankshaft to TDC. Subsequently a mechanic can proceed to remove timing chain itself together with oil control valves, timing chain tensioner/chain guides/
Camshafts/rocker arms/lash adjusters. At this point it will be safe for any technician to partially unscrew cylinder head bolts until they can lift the head off block comfortably. Thereafter you are required to send off your cylinder head for inspection or servicing. Ensure that mating surfaces are clean and clear when fitting in a new gasket; if there is any damage file or machine if necessary; Line up new gasket onto dowel pins with caution as it positions on top of engine block; New cylinder head bolts have now become available, and they should be tightened in the prescribed order.tighten them according to prescribed order; Finish doing what remains including changing oil/filter and refilling cooling system; Begin checking for leaks while starting an engine whether there is proper operation of an engine.