Chevrolet TrailBlazer, Service Manual

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EN-48464 Installation
22. Install a EN-48464 lower timing gear tensioner holding tool between the timing
chain and the crankshaft sprocket. Place it so that the narrow ramp of the wedge
faces the timing chain. Seat the tool by taping it lightly with a plastic or brass
hammer. Once seated, unscrew and remove the handle.
23. Remove the upper cylinder head access hole plugs.
24. Hold the camshafts in places using a 1 in (25 mm) open end wrench on the
camshaft hexes.
25. Remove and discard the bolts from the cylinder head near intake and exhaust
timing chain tensioner shoes.
26. Remove the upper timing chain tensioner shoes bolts from the engine block.
27. Remove and discard the bolts from the intake and exhaust camshaft sprockets.
28. Remove the intake and exhaust camshaft sprockets from the camshafts with the
timing chain.
29. Remove the intake and exhaust sprockets from the timing chain.
30.
Attach a piece of mechanic’s wire to the timing chain and let it drop into the engine
block.
31. Shock the cylinder head bolts using a drift punch and a hammer.