Mercury 4L2Z-6600-A Pump Assembly - Oil

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To change the oil pump, the oil pan and the baffle should be detached, the bolts that hold the oil pump should be loosened and the oil pump pulled up off the engine. Subsequently, pull out the oil pump intermediate driveshaft where two ends are of different shape and the retainer ring location has to be observed. Following that, you will have to unscrew the inlet tube and screen from the oil pump. During installation, it is requisite to pour a moderate amount of fresh clean engine oil into one of the oil pump ports and then manually turn the oil pump drive to achieve priming of the pump. Place the oil pump pick-up tube with a new gasket and fit the intermediate drive shaft into the position with the pointed end forward having correct position of the retaining ring. Place the oil pump onto the engine block and fit a new gasket if necessary, then fasten the oil pump bolts, torque set accordingly. The rest of the steps are in reverse order to the removal steps. Last, turn on the engine; observe that the oil pressure reading comes up to normal; if it does not rise to normal, shut down the engine right away because low oil pressure may harm the engine catastrophically.

The remainder of installation is the reverse of removal.

Fill the engine with the correct type and quantity of oil, start the engine, and check for leaks.

After inserting the intermediate drive shaft, the oil pump should be installed on the block using a new gasket. Make sure the pump engages the driveshaft, then install the oil pump bolts and tighten them to the specified torque.

Prime the oil pump by connecting it to a drill motor and rotating it until there is some resistance. This may take 10 or more revolutions of the sprocket.

Pull the oil pump intermediate driveshaft out of the engine.

If necessary, unbolt the inlet tube and screen from the pump.

Remove the two mounting bolts for the chain guide and then remove the guide. The tensioner is secured by one mounting bolt while the guide is held by two.

Pull off the sprocket (a puller may be required), and remove the key from the shaft.

The first step is to remove the oil pan.

Install the oil pump pick-up tube on the pump, using a new gasket. Make sure the screen is clean and free of debris.

Remove the chain tensioner mounting bolt and the tensioner, noting the spring location. The tensioner is secured by one mounting bolt while the guide is held by two.

Install the mounting bolt and tighten it to the torque.

The oil pump hex driveshaft will come out with the pump. Examine the ends for wear (Replace the oil pump driveshaft if either end is worn). Caution: If this shaft breaks, serious engine damage can result. If it looks worn, replace it.

Remove the lower and upper oil pan sections. Note: This involves either removing the engine from the vehicle, or raising the engine.