Check this procedure.... Timing Chain & Sprockets-Removal & Installation for 4.2L Engine
Fig. Proper installation of the crankshaft holding tool with the No. 1 cylinder at TDC (click image for zoom)
Fig. Rotate the camshaft actuator clockwise
Fig. The dark lines on the timing chain should be aligned with the marks on the sprockets
NOTE
The following procedure requires the use of the Crankshaft Holding tool No. J-44221 and a suitable torque angle meter.
To install:
Camshaft cover
Timing chain (front) cover
Tension on the timing chain by moving the tensioner shoe in. Place a tee into the tension to hold the shoe in place.
Top chain guide bolts and guide
Exhaust camshaft position actuator bolt and actuator
Intake camshaft sprocket bolt and sprocket
Timing chain
Crankshaft sprocket
Cylinder head access hole plugs
Timing chain tensioner shoe bolt and shoe
Timing chain tensioner guide bolts and guide
Timing chain tensioner bolts and tensioner
NOTE
Every seventh link of the timing chain is darkened to help in aligning the timing marks.
Timing chain tensioner and bolts. Tighten to 18 ft. lbs. (25 Nm).
Timing chain guide and bolts. Tighten to 89 inch lbs. (10 Nm).
Timing chain tensioner shoe and bolt. Tighten to 19 ft. lbs. (26 Nm).
Cylinder head access hole plugs and tighten to 44 inch lbs. (5 Nm)
Crankshaft Holding tool No. J-44221, or equivalent with the camshaft flats up and the No. 1 cylinder at Top Dead Center (TDC)
Crankshaft sprocket
Intake camshaft sprocket into the timing chain
NOTE
It may be necessary to remove the crankshaft holding tool to
rotate and hold the camshaft hex to align the pin to the camshaft
sprocket
NOTE
It may be necessary to remove the crankshaft holding tool to
rotate and hold the camshaft hex to align the pin to the camshaft
sprocket
NOTE
Rotate the camshaft actuator clockwise relative to the camshaft prior to tightening the bolt.
Timing chain onto the crankshaft sprocket. Align the dark link of
the timing chain with the timing mark on the crankshaft sprocket.
Intake camshaft sprocket onto the intake camshaft
Intake camshaft washer and bolt
Exhaust camshaft actuator into the timing chain. Align the dark
link of the timing chain with the timing mark on the exhaust camshaft
actuator.
Exhaust camshaft actuator onto the exhaust camshaft
WARNING
The camshaft actuator must be fully advanced during installation.
Engine damage may occur if the camshaft actuator is not fully advanced.
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Top chain guide
Suitable threadlock to the top chain guide bolt threads, then install and tighten to 89 inch lbs. (10 Nm)
Engine front cover
Camshaft cover
continue...
Cylinder Head - Removal & Installation - 4.2L Engine
Before servicing the vehicle, refer to the Precautions section.
Disconnect the negative battery cable.
Drain the engine cooling system.
Remove or disconnect the following:
Camshaft cover
Unfasten the cylinder head bolts by loosening them in the reverse
of the torque sequence, then carefully remove the cylinder head.
Remove the cylinder head gasket.
To install:
Carefully clean and inspect the cylinder head and the gasket mounting surfaces.
The gasket surfaces on both the head and block must be clean of
any foreign matter and free of nicks or heavy scratches. The cylinder
bolt threads in the block and thread on the bolts must be cleaned (dirt
will affect the bolt torque).
DO NOT apply sealer to composition steel-asbestos gaskets.
Make sure the number 1 cylinder is at Top Dead Center (TDC).
If using a steel only gasket, apply a thin and even coat of sealer to both sides of the gaskets.
Place a new gasket over the dowel pins with the bead or the words
-This Side Up'' facing upwards (as applicable), then carefully lower the
cylinder head into position over the gasket and dowels.
Apply a coating of 12345493 or equivalent sealer to the threads of
the cylinder head bolts, then thread the bolts into position until
finger-tight.
Tighten the cylinder head bolts in sequence as follows:
Tighten the long bolts (1-14), in sequence, to 30 ft. lbs. (40 Nm).
Tighten the long bolts, in sequence, an additional 90 degrees.
Tighten the long bolts, in sequence, an additional 60 degrees.
Tighten the 2 long end bolts to 15 ft. lbs. (20 Nm).
Tighten the 1 short end bolt to 13 ft. lbs. (18 Nm).
Install or connect the following:
Cylinder head access hole plugs and tighten to 44 inch lbs. (5 Nm)
Properly refill the engine cooling system.
Run the engine to check for leaks.
Keep us updated; hope helps.
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