The Buick 3800 engine is a large, high output V6 engine. The oil pump O-ring is located where the oil filter connects to the oil pump. The oil inside the oil pan must be drained and the oil filter removed to replace the O-ring. The replacement O-ring must be specific to the 3800 V6 engine; you can purchase the O-ring at an auto parts store.
Things You'll Need
- Jack stand
- Drain pan
- 5/8-inch socket
- Flat head screwdriver
- Replacement O-ring
Raise the front of the Buick using the jack, and support the front of the Buick on two jack stands. Get under the engine and position the drain pan under the drain plug on the bottom of the oil pan.
Remove the plug from the bottom of the oil pan using the socket and ratchet. Drain the oil into the pan, then replace the plug to the oil pan.
Twist the oil filter in a counterclockwise motion until the filter comes off the oil pump. Using the flat head screwdriver, pry the O-ring from the oil pump and pull the ring off the pump.
Place the new O-ring in the same place as the old one, and push the ring into place. Replace the oil filter to the bottom of the pump, and tighten the filter until it is snug.
Remove the drain pan from under the Buick. Raise the front of the Buick using the jack, and remove the jack stands. Lower the Buick to the ground.
Tips & Warnings
- Replace the oil filter with a new one and replace the engine oil with fresh oil once you are finished with this job.
- "General Motors: Buick Regal, Chevrolet Lumina, Olds Cutlass Supreme, Pontiac Grand Prix, 1988-2007 (Haynes Repair Manual)"; Robert Maddox; 2009
Pontiac 3800 V6 Engine Specifications
The 3800 V-6 engine was the staple engine for midsize GM cars from the late 1980s through the 2000s. In the mid...
What Is Involved in a 3800 V6 Engine Tune-Up?
A V6 with a displacement of 3800 cubic centimeters is a common engine in Ford, GM, and Chrysler vehicles. Each manufacturer produces...
How to Replace an Oil Pump in a Oldsmobile Alero
An oil pump is a necessary tool for the survival of your engine. It keeps the engine components in the Oldsmobile Alero...
How to Replace an Oil Pump in a Subaru Outback
An oil pump is a necessary tool for the survival of the engine. It keeps the engine components in the Subaru Outback...
How to Replace a PCV Valve on a Buick 3800
Buick equipped the V-6 3800 (Fireball) engines with a positive crankcase ventilation (PCV) valve to vent crankcase gasses into the intake manifold....
How Do I Replace the Thermostat in a Buick 3800?
The Buick 3800 engine, used in several Buick models over the years including the Le Sabre, sported a V6 engine configuration. The...
Where Is the Oil Filter Located on a Mazda Tribute V6?
Changing the engine oil and oil filter is a maintenance task which needs to be done on a regular basis. Many people...
Oil Filter Location on a 4.3 Liter V6
The 4.3 liter V-6 engine has been a part of the Chevrolet and GM lineup since it was introduced in the Chevrolet...
How to Change an Oil Pump in a Buick LeSabre
Changing the oil pump on a Buick LeSabre depends largely on the year of the car. Change the pump yourself if you...
How to Replace an Oil Pump
A car engine's oil pump pulls oil out of the oil pan and distributes it throughout the engine. The engine oil lubricates...
How to Change Oil in a Buick LeSabre 2000
An oil change is one of the best regular maintenance procedures you can perform on your vehicle. Oil gets weak and thin...
How to Repair the Water Pump on a 3800 Engine
The 3800 3.8-liter V6 engine is a popular engine used by GM in several vehicle lines, including Pontiac, Chevrolet, Oldsmobile and Buick....