Mercury F77Z-6268-BC Chain Assembly

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To check camshaft end play, must first remove the timing chain cover and the rocker arm shafts. Rotate the camshaft as far back in its bore as possible or as far forward as possible and then install a dial indicator so that its index is on sprocket bolt with the indicator moved to zero. You can now pry the camshaft forward using a large screwdriver or pry bar between the camshaft sprocket and the block; then, compare a dial indicator reading taken at the beginning and at the end of this operation to the amount of end play recommend and if the end play exceed the camshaft thrust plate should be replace. For timing chain and tensioner inspection, too, ease off the timing chain cover and timing chain tensioner, noting a reference mark on the block. Twist the crankshaft anti-clockwise until the right side of the chain is tight then measure from the reference point to the right side. If the deflection is still present, turn the crankshaft clockwise to take up any lateral movement on the left side and recheck; the amount of either will depend on how much it changed to determine the degree of slack in the timing chain and, if severe enough, it should be replaced. It is the component that should be checked for any signs of wear or damage and if so should be changed; this part should be retracted before it is engaged. To remove the chain and sprocket you will have to drain off the cooling system and the engine oil, then remove the oil pan, the drive belt and finally remove the timing chain cover. Synchronize the timing marks by rotating the crankshaft, note/unscrew or remove the timing chain tensioner or camshaft sprocket bolt and/ or take off the sprockets and the chain but do not facilitate the crankshaft or the camshaft. If required then it is possible to take out chain guide bolts and then turn out the guide. For refitting, align the crankshaft and the camshaft sprocket timing marks, fit the crankshaft pulley if removed and tighten the guide bolts on the chain if removed. Position the sprockets in such a manner that their timing marks face each other, then fit them onto the crankshaft and the camshaft in order; confirm that the chain is central and not loose.Apply an additional 15-35 m/kg or ft/lb on the camshaft sprocket bolt, then compress the tensioner pad with the help of a sharp-tipped probe tool in order to pull back the tensioner into the required position.Last is to fit the timing chain tensioner and fasten it's nuts and bolts, after reinstalling other parts in reverse order start the engine and look for leakage of oil or coolant.

To check camshaft end play, must first remove the timing chain cover and the rocker arm shafts. Rotate the camshaft as far back in its bore as possible or as far forward as possible and then install a dial indicator so that its index is on sprocket bolt with the indicator moved to zero. You can now pry the camshaft forward using a large screwdriver or pry bar between the camshaft sprocket and the block; then, compare a dial indicator reading taken at the beginning and at the end of this operation to the amount of end play recommend and if the end play exceed the camshaft thrust plate should be replace. For timing chain and tensioner inspection, too, ease off the timing chain cover and timing chain tensioner, noting a reference mark on the block. Twist the crankshaft anti-clockwise until the right side of the chain is tight then measure from the reference point to the right side. If the deflection is still present, turn the crankshaft clockwise to take up any lateral movement on the left side and recheck; the amount of either will depend on how much it changed to determine the degree of slack in the timing chain and, if severe enough, it should be replaced. It is the component that should be checked for any signs of wear or damage and if so should be changed; this part should be retracted before it is engaged. To remove the chain and sprocket you will have to drain off the cooling system and the engine oil, then remove the oil pan, the drive belt and finally remove the timing chain cover. Synchronize the timing marks by rotating the crankshaft, note/unscrew or remove the timing chain tensioner or camshaft sprocket bolt and/ or take off the sprockets and the chain but do not facilitate the crankshaft or the camshaft. If required then it is possible to take out chain guide bolts and then turn out the guide. For refitting, align the crankshaft and the camshaft sprocket timing marks, fit the crankshaft pulley if removed and tighten the guide bolts on the chain if removed. Position the sprockets in such a manner that their timing marks face each other, then fit them onto the crankshaft and the camshaft in order; confirm that the chain is central and not loose.Apply an additional 15-35 m/kg or ft/lb on the camshaft sprocket bolt, then compress the tensioner pad with the help of a sharp-tipped probe tool in order to pull back the tensioner into the required position.Last is to fit the timing chain tensioner and fasten it's nuts and bolts, after reinstalling other parts in reverse order start the engine and look for leakage of oil or coolant.

Ensure that the drilled oil passage in the camshaft bolt is open before installation and do not substitute any other type of bolt.

Run the engine and check for oil or coolant leaks.

Recheck all timing marks to ensure they are still in alignment before installing the rocker arms.

Set the camshaft timing for the left camshaft sprocket and the right camshaft sprocket using the special tools.

Remove the camshaft alignment tool (if installed).

1. Remove the timing chain cover. 2. Align the crankshaft and camshaft timing marks. 3. Mark a reference point on the top chain link and position a ruler over the top of the chain. 4. Attach a torque wrench to the camshaft sprocket bolt and apply 15 ft-lbs of torque in the counterclockwise direction without allowing the crankshaft to rotate. 5. Note the point where your mark aligns on the ruler. 6. Apply 15 ft-lbs of torque in the clockwise direction and note the amount of movement. 7. The measurement is the timing chain deflection. If deflection is more than 1/8-inch, replace the timing chain (see below). 8. Check the tensioner for wear and damage. If tensioner face wear is excessive, replace the tensioner. Before reinstalling the tensioner, it must be retracted (see Step 28). Tighten the tensioner bolts to the torque.

The timing system is complex, and severe engine damage will occur if any mistakes are made. Do not attempt this procedure unless highly experienced with this type of repair. If unsure of abilities, consult an expert. Double-check all work and ensure everything is correct before attempting to start the engine.

Remove the camshaft alignment tool (if installed).

Remove the timing chain cover.

Install the primary timing chain, aligning the colored links with the marks on the sprockets, and then pull the pins holding back the two primary chain tensioners.

Remove the Torx bolt and spacer through the opening, then remove the cassette bolt and the chain and cassette.

Zero the dial indicator.

Remove the top cassette bolt and the camshaft sprocket, then remove the lower cassette-to-block bolt. Remove the cassette, chain, and jack shaft sprocket.

Turn the crankshaft until the key is facing up (12 o'clock position). Drape the chain over the camshaft sprocket and turn the sprocket until the timing mark faces down (6 o'clock position). Mesh the chain with the crankshaft sprocket and position the camshaft sprocket on the end of the camshaft.

Disconnect the negative battery cable from the battery.