Cadillac 8655985 Body,Automatic Transmission Oil Pump

Through removing the oil pan, the oil pump and screen can be accessed. For Buick engines, you should put the driveshaft extension via the main bearing cap until it mates with the distributor drive gear. Thereafter, put the pump on top of the cap and secure it using bolts. In 231, 252 and 350 Buick engines, however, the oil pump is located in the timing chain cover and is connected to a pipe assembly and oil screen housing in the pan. To remove them, you must first take out the oil filter. The cover assembly now becomes removable allowing one to remove oil pump gears. For that case, it's important that gears should be cleaned as well as inspected for defects. Oil pump gear wear specifications are also available for 1981-87 engines. Gear tip wear can be measured by passing a narrow feeler gauge between gear teeth tips and wall of the oil pump housing. Checking for any wear or scoring on its surface then is necessary concerning lubrication of relief valve along with spring using clean engine oil so that they can be placed in cover again. When reinstalling gears petroleum jelly must fill up inside of an oil pump gear cavity. This time around when installing use new gasket and sealer on a cover assembly as well as use a final step to install an oil filler.

If needed, extract the pick-up screen and pipe assembly from the pump body.

Ensure that the oil pump screen is parallel with the oil pan rails for proper fitting into the oil pan.

Replace any unserviceable gears with new ones.

The pump may not prime if the pocket is not adequately packed.

Pay close attention to the oil pressure gauge or warning light during the initial engine start-up period.

Install the pressure regulator valve and related parts first, followed by the drive gear and shaft in the pump body, then the idler gear with the smooth side facing the pump cover opening, lubricating the parts with engine oil.

Unscrew and remove the oil filter.

The clearance should be between 0.002 to 0.006 inches.

Insert the oil pump gear and shaft into the oil pump body section of the timing chain cover, then use a straightedge over the gears to measure the clearance between the gears and the gasket surface.

The final step is to install the mounting bolts and nut, tightening them to the specified torque, and then reinstall the oil pan.

Remove the oil pan.

Remove the cover assembly and slide out the oil pump gear.

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.