Ford AT4Z-6256-B Sprocket - Camshaft

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Tighten the bolt to the specified torque.

These engines are difficult to work on and require special tools. Procedures involving the timing chains must be read carefully, and disassembly should use the special tools to avoid engine damage.

Remove the rocker arms from the "Stage 1" designated cylinders, then rotate the crankshaft to the 6 o'clock position and remove the remaining rocker arms.

If not previously removed, remove the left-side upper cassette bolt and the lower cassette bolt. Then remove the cassette and chain with the jackshaft and camshaft sprockets.

Depress and lock the secondary chain tensioner on each bank, using the factory tool (303-1530) inserted in the large hole at the first camshaft bearing cap, or use a length of threaded rod and nuts to hold the tensioner down, by pushing from the camshaft bearing cap.

89. If the primary chain gear and its plate were removed, clean the mounting surface and the block, then install the sprocket and plate with a new gasket. Prepare the primary chain tensioners by pushing in the release button and compressing the plunger until a nail or large paper clip can be inserted to hold the plunger. 90. If the secondary timing chain tensioners were removed, they cannot be reused. New tensioners must be installed. 91. The tensioner is installed to the correct depth when you hear a snap. Install the tensioner shoe. The plastic clip can now be removed with pliers. 92. Align the colored links with the marks on the VCT units and install the chain.

1. Disconnect the cable from the negative battery terminal. 2. Remove the valve covers. 3. Remove the timing chain cover.

If the chain has broken, there will be damage to the valves and possibly the pistons, necessitating the removal of the cylinder heads.

Remove the two bolts and the primary timing chain tensioner arm, then unbolt and remove the two tensioners.