Mercury 3W4Z-6600-AA Pump Assembly - Oil

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1. Replace all gaskets with new ones. 2. On 1.5L and 1.6L engines, tighten the oil pump mounting bolts in sequence. 3. On 2.0L, 2.3L, and 2.5L engines, tighten the oil pump mounting bolts. 4. After installing the oil pan, install a new oil filter and refill the crankcase with oil. 5. Check for any oil warning lights in the instrument panel after the vehicle has been started and idling.

Dip the rotors in clean engine oil and install them into the pump body with any identification marks positioned as noted during disassembly.

Installation is the reverse of removal, paying special attention to the chain tensioner spring shoulder bolt and the oil pan alignment.

4. Remove the oil pump cover from the oil pump body. 5. Note any identification marks on the rotors and withdraw the rotors from the pump body. 6. Thoroughly clean and dry the components. 7. Inspect the rotors for obvious wear or damage. If either rotor, the pump body, or the cover is scored or damaged, the complete oil pump assembly must be replaced. 8. If the oil pump components are in acceptable condition, dip the rotors in clean engine oil and install them into the pump body with any identification marks positioned as noted during disassembly. 9. Install the cover and tighten the screws securely.

The special washers must be placed back in their original positions to maintain engine timing.

1. Remove the oil pan. Remove the oil pick-up tube and screen. 2. Remove the engine front cover, timing chains, and crankshaft sprockets. 3. Loosen each of the four oil pump mounting bolts one turn. Then, gradually and evenly, loosen each bolt in several steps. When all bolts are loose, remove the bolts and oil pump.