For various Nissan engines, remove and install the front cover,first by disconnecting the negative battery cable, draining coolant, and removing the
Radiator with upper and lower hoses. Loosen the adjusting screw for the alternator drive belt and remove it, then take away the alternator bracket bolts to free up room for the alternator.
Distributor removal can be done if necessary. Removing the
Oil Pump attaching screws will result in removal of both pump and its drive spindle. After taking out cooling fan pulley, fan pulley and drive belt, one can now proceed to remove
Water Pump crankshaft pulley bolt and then remove crankshaft pulley. Take out screws that hold front cover on front end of cylinder block, front of oil pan to bottom of front cover and through down into top of front cover; there are also other bolts for that purpose too. Carefully pry off front cover from engine. When installing new gaskets for oil pan as well as top front cover make sure they are applied with sealer in correct position on engine. Lightly grease crankshaft oil seal before fitting front cover with care. Then tighten all bolts back to their torque accordingly including all those attaching oil pan together with installing the same after priming up with oil followed by pumping it properly into place. Install new gasket on water pump followed by mounting water pump onto engine along with tightening crankshaft pulley bolt; then finally reassemble everything else removed such as distributor, alternator, drive belts and radiator amongst others. Finish by reconnecting upper and lower radiator hoses followed by refilling cooling system, reconnecting negative battery cable/start engine/check ignition timing/inspect for leaks as appropriate etc. For KA24DE engine on 240SX model these include draining engine oil or coolant, supporting vehicle safely & removing
Cylinder Head assembly. Take off No 1 piston at TDC compression stroke then unbolt air conditioning compressor drive belts; alternator drive belts; power steering pump; compressor idler pulley; crankshaft pulley; oil pump; rocker arm cover and oil pan. The front cover bolts are removed, making sure that the front cover is carefully pried off from the head and block surface. Clean surfaces, replace oil seals in block then install as described above including installing new rubber plugs into timing cover oil seal holes and carefully fitting the front cover. Reassemble components, refill fluids, and tune engine, if necessary.