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4.6L EngineNOTE Because of the bulk and complexity of the 4.6L engine, cylinder head removal may best be accomplished with the engine out of the vehicle. For this procedure it may be most economical to remove the entire powertrain and cradle out the bottom of the body and to utilize the cradle as an engine stand.
WARNING With the camshafts remaining in the cylinder head some valves will be open at all times. Do not rest the cylinder head on a flat service with the cylinder face down, or valve damage will result.
WARNING When cleaning aluminum gasket services, use only plastic or wood scrapers and/or an appropriate chemical dissolving agent to avoid damaging the sealing surfaces.
FIG : Cylinder head torque sequence-4.6L Northstar engine
4.6L EngineCamshaft Primary Drive Chain
NOTE The intermediate shaft need not be removed unless wear is evident.
FIG : Primary timing chain-4.6L Northstar engine
Camshaft Secondary Drive Chain
FIG : Secondary timing chain-4.6L Northstar engine
Setting camshaft timing is necessary whenever the cam drive system has been disturbed such that the relationship between any chain and sprocket has been lost. Correct timing exist when the crank sprocket and the intermediate shaft sprocket have their timing marks aligned and allXXXXXpins are perpendicular (90°) to the cylinder head surface.
NOTE The RE cam sprocket must contain the cam position sensor pick-up.
FIG : Setting camshaft timing-4.6L Northstar engine
FIG : Camshaft chain guides-4.6L Northstar engine
FIG : Primary chain tensioner-4.6L Northstar engine