The General Motors 2.4 liter four cylinder twin cam engine debuted in 1988 and was originally developed as the Quad Four. The engine has been around for a number of years, so ample parts are available for repairs and modifications. The 2.4 liter twin cam engine delivered horsepower during an era when larger V8 engines only produced 20 horsepower more. General Motors used the engine on the Pontiac Grand AM SE as the base engine in 1999 and it was rated at 150 horsepower at 5,600 rpm with 155 foot pounds of torque at 4,400 rpm.

Hand screw the crankshaft pulley bolt back on so you can move the crankshaft. Turn the crankshaft in the clockwise direction until the camshaft sprockets timing pin holes align with the holes in the timing chain housing. Now insert two 8 millimeter pins or bolts into the holes of the camshaft sprockets to keep this alignment. There are two marks that look like rivets on the crankshaft sprocket. These should line up with the mark on the engine block. The crankshaft sprocket keyway should point up and line with the center line of the cylinder bores. The engine is now locked into the timed position.

Do not use a jaw type puller because the teeth can ruin the pulley. You need to support engine from above to be able to use the crankshaft puller tool.

Not all models have an oil slinger.

Early models earlier than 1999 are equipped with a one piece tensioner and shoe assembly that must be disengaged from the wear grooves in the tensioner shoe in order to remove the tensioner assembly. On this model, slide a standard screwdriver blade under the timing chain while pulling out the tensioner shoe.

Later models of timing chain tensioners possess a two piece tensioner and shoe assembly. Detach the timing chain tensioner and then the timing chain shoe by using a snap ring pliers to remove the plastic tab that keeps the tensioner shoe to the pivot pin.