Chevrolet 10146802 Pump Assembly, Oil

Remove the oil pan. Place a large drain pan under the engine. Unbolt the pump from the rear main bearing cap. Lower the pump and extension shaft from the engine. Before installation, prime the pump with engine oil. Pour oil into the pick-up while the pump extension shaft is turned. Attach the pump, extension shaft and retainer to the main bearing cap. While aligning the pump with the dowel pins at the bottom of the main bearing cap, align the top end of the extension shaft with the lower end of the oil pump drive. When aligned properly, it should slip into place easily. Install the pump mounting bolt and tighten it. Install the oil pan and add oil.

In order to replace the oil pump for four cylinder, it is necessary to initially take off the oil pan After that, you should unscrew the two flange mounting bolts and the nut from the main bearing cap bolt and pump as well as the screen. Then you need to fit a pump and a screen; make sure the pump shaft is parallel with the driveshaft tang while sliding to the lower bushing; if this does not work out, adjust the 'drive slot' so that the pump can slide over them. Torque the pump bolts to the required level and replace the oil pan. First for the V6 engine, set down the oil pan and draw out the pump and the driveshaft extension out as well. Screw on the oil pump and the driveshaft extension into the distributor driveshaft gear, the pump to the rear bearing cap bolt, tighten to the torque recommended before putting the oil pan back with the bolts tightened to the recommended torque. Oil all engines and for all engines check the oil level and the oil pressure and look for any sign of leakage. During the disassembly process, the residual oil should be drained from the internal chamber of the pump and the driveshaft as well as the extension should be removed; also, the pump cover and the gears should also be removed; in addition, the pressure regulator valve retaining pin and a spring should also be removed, but care should be taken when handling the spring as it releases pressure. If the valve is stuck, soaked the pump housing in carburetor cleaning solvent, and clean all the parts of the pump. The pump parts should be checked for foreign material, cracks, scoring and wear; the idler gear and shaft should fit tightly in the housing of the pump; any of the above mentioned should warrant the replacement of the pump assembly. Make sure suction pipe and screen assembly are loose and free, examine the gears for signs of wear or damage and measure gear-clash and the depth, diameter and side clearance of gears and replace the pump, if it is out of the specifications. When reassembling the pump apply engine oil to all internal parts, place the gears of the pump with their indications towards the cover, and fill all the cavities with petroleum jelly for easy priming. Place the pump cover, pressure regulator valve and spring and tighten the cover bolts in accordance to the prescribed torque. Before reinstalling the oil pan must be clean, as well as an oil pressure sending unit must be removed to fit a pressure gauge. Switch on the engine and observe the oil pressure if the suction pipe is not well anchored the oil pressure should rise quickly if it fails to do so then dismantle the oil pump, fill the cavities with petroleum jelly and then put the pump back to avoid causing harm to the engine.

The oil filter must first be removed.

Install the oil pump screen bracket over the main bearing cap bolt and secure it with the nut.

Begin by removing the pump cover retaining screws and the pump cover, marking the gear teeth for reassembly. Next, take out the idler gear, drive gear, and shaft from the body.

If the oil pump is defective, it should be replaced with a new one. It is not recommended to reuse the original pump or attempt to rebuild it.

The pump should be lowered carefully from the engine.

Position the pump assembly and align the slot on the top end of the extension shaft with the drive tang on the lower end of the distributor, ensuring proper mating between these components since the distributor drives the oil pump.

Position the pump and align the top end of the hexagonal extension shaft with the hexagonal socket in the lower end of the distributor drive gear, ensuring correct alignment as the distributor drives the oil pump.

Replace the cover.

Check the idler gear shaft and the drive shaft extension for looseness.

Apply gasket sealant to the end of the pipe and carefully tap it into the pump body, ensuring no damage occurs. If the original press-fit cannot be achieved, a rear assembly must be used to prevent air leaks and loss of pressure.

Unscrew the oil pressure relief valve cap, spring, and valve, ensuring not to remove the oil filter by-pass valve and spring as they are staked in place.

Finally, install the cover and torque tighten the screws. Then, turn the driveshaft to ensure that the pump operates freely.

For V6 engines, remove the bolt that secures the pump to the rear main bearing cap.

Remove the oil pump and screen assembly.

Apply gasket sealant to the end of the pipe and carefully tap it into the pump body to avoid damage.

Detach the pump by removing the pump-to-rear main bearing cap bolt and separate the pump and extension shaft from the engine.

After the pump cover, install the pressure regulator spring and valve.

Replace the oil pump if the clearance is not correct.

The first step is to remove the oil pan.

Prime the pump by pouring clean engine oil into the pick-up screen while turning the pump driveshaft.

Install the oil pan and add oil.

Attach the oil pump to the force balancer assembly, ensuring the top end of the oil pump drive aligns with the lower end of the oil pump for easy placement.

Remove the oil pan.

Remove the oil pan.