WHere do I find, and how do I change, the oil pump on a 1986 GMC 454 block engine?
Make : GMC
Engine: 454 Block
Finding the oil pump.
Hello & Welcome to JA,
Here is information to help you. The oil pump is inside the oil pan.
Gasoline V8 and V6 Engines
See Figures 1, 2, 3 and 4
Attachments are only available to registered users.
Fig. Fig. 1: The starter assembly and flywheel cover must be removed for access.
Fig. Fig. 2: Loosen and remove the oil pan bolts using a ratchet, extension and suitable socket
CAUTION Take extreme caution if the engine must be raised to remove the oil pan. Make sure the engine lift or hydraulic jack is firmly set. If at all possible, block the engine in this position using wooden blocks between the engine block or engine mounts and jackstands or the vehicle frame rail.
Fig. Fig. 3: Pivot the oil pan rearward and begin to pull it down
Fig. Fig. 4: Once the pan clears the engine and the lower crossmember you will be free to remove it from the vehicle
See Figures 1 and 2
The oil pump is mounted to the bottom of the block and is accessible only by removing the oil pan.
Fig. Fig. 1: Oil pump installation
Fig. Fig. 2: Oil pump exploded view