Buick 12693523 Pump Assembly, Oil

You can Select Your Vehicle to check if 12693523 fits your vehicle.

In order to take off the timing chain cover, it is necessary to lift the car, put on jackstands, and unbolt or totally eliminate any parts which are in the way of lowering the oil pan, for example, wiring harnesses. Thirdly, take out all bolts in front of the oil pan but the two down bolts, half tighten them so as to lower the front part of the oil pan then give access to the bolt of the oil pick-up of the pump. When loosening the oil pump pick-up bolt make sure it does not fall in the pan, remove the oil pick-up tube from the pump with the help of a rag so as not to misplace the bolt or O-ring. Next remove the oil pump bolts and slide the pump and the pick-up tube O-ring over the crankshaft. To inspect, unbolt the oil pump cover and take out the rotors, wiping all part with a solvent and searching for signs of wear and tear at the bolt holes as well as the splined area on crankshaft sprocket; because there are no replacement parts for the rotors, bearings, gears, or other parts, replace the entire oil pump, if any one of them is scored, scratched, or worn. For installation reverse the assembly procedure by pouring clean motor oil into the pick-up tube hole while manually rotating the pump then put the oil pump in place and have the teeth of the crankshaft sprocket engaging with those of the oil pump drive gear making sure that it is fully seated on the block. Put a new O-ring on the oil pump and tighten it according to the torque specifications and also place a new O-ring on the oil pick-up pipe and secure it to the oil pump as well as the engine block main studs while making sure that the pick-up tube to oil pump bolts are tightened up tightly so as to prevent air from getting into the oil circuit. Last but not the least, place and fix the timing cover against the chain, then place the oil pan and fix it on the block in the reverse sequence that it was removed. Whenever necessary, put oil and coolant, start the engine and look for signs of leakage and oil pressures.

Remove the oil pan and unbolt the oil pump, lowering it from the engine. The oil pump driveshaft will come out with the pump, which is a rod with flat sides at each end. If the pump is defective, replace it with a new one, avoiding reuse or attempts to rebuild the original. Inspect the ends of the oil pump driveshaft and the plastic collar that retains it; if there are signs of wear or if the collar is cracked or missing, replace the shaft with a new one. The plastic collar centers the oil pump driveshaft over the oil pump shaft, and its absence can lead to damage. A new plastic collar is typically included with a new oil pump or driveshaft. Prime the pump by pouring clean engine oil into the pick-up screen while turning the pump driveshaft. To install the pump, align the flat on the driveshaft with the slot in the oil pump shaft, ensuring the plastic collar is fitted over the joint, then install the oil pump and driveshaft assembly into the block, engaging the upper end of the driveshaft into the oil pump drive. Finally, install the pump mounting bolt and tighten it to the specified torque, with the remainder of the assembly being the reverse of the removal process.

If the collar is cracked or missing, the shaft should be replaced with a new one, as the plastic collar centers the oil pump driveshaft over the oil pump shaft and its absence can lead to damage.

For inspection, remove the oil pump cover and extract the rotors, cleaning all components with solvent and checking for damage, including the bolt holes and splined surfaces on the crankshaft sprocket. Replace the entire oil pump assembly if any components are scored, scratched, or worn, as no serviceable parts are available.

Start by taking off the oil pump pick-up tube mounting nuts and bolts, then lower the pick-up tube and screen assembly from the vehicle, ensuring to remove the bolt securing the oil pick-up tube to the oil pump.

Install the new oil pump in the same orientation as the original gears.