This procedure assumes you have a basic understanding of engine mechanics and have the necessary tools. These tools include:
* Valve adjustment wrench: Specifically sized for your Oldsmobile 350's rocker arm nuts. These are usually a feeler gauge wrench combination.
* Feeler gauges: A set to measure valve lash (clearance). Your Oldsmobile 350's specifications will dictate the correct lash for both intake and exhaust valves. Find this in your shop manual (highly recommended).
* Socket set: For removing the valve covers.
* Wrench set: For various bolts and nuts.
* Shop manual specific to your Oldsmobile 350's year: This is absolutely crucial. Specifications (valve lash, torque specs, etc.) vary by year and even engine code.
* Torque wrench: To ensure proper tightening of the rocker arm nuts.
* Jack stands: To safely lift and support your vehicle.
Procedure (General Outline – Consult your Shop Manual for specifics):
1. Safety First: Disconnect the negative battery terminal. Support the vehicle securely with jack stands. Wear safety glasses and gloves.
2. Locate and Remove Valve Covers: Locate the valve covers on top of the engine. Remove the bolts securing them, and carefully remove the covers.
3. Identify Intake and Exhaust Valves: Familiarize yourself with the location of the intake and exhaust valves. Your shop manual will have diagrams.
4. Determine the Correct Valve Lash: Your shop manual will specify the correct valve lash (clearance) in thousandths of an inch (or millimeters) for both intake and exhaust valves for your specific engine.
5. Rotate the Engine to the Proper Position: You need to rotate the engine to position each cylinder's valves so you can adjust them. This is typically done by rotating the crankshaft (using a socket on the crankshaft bolt) while monitoring the position of the rocker arms. Your shop manual will explain how to properly position the crankshaft for each cylinder. This is critical. Adjusting valves with the engine out of time can cause significant damage. Some use the distributor to align the engine, but this method is prone to errors.
6. Adjust Valve Lash:
* Use the appropriate feeler gauge to check the clearance between the rocker arm and the valve stem.
* Loosen the rocker arm nut.
* Adjust the rocker arm until the feeler gauge slides with a slight drag (this takes practice and a feel for it).
* Tighten the rocker arm nut to the specified torque (consult your shop manual).
* Repeat this process for each valve in each cylinder.
7. Repeat for All Valves: Carefully repeat steps 5 and 6 for all intake and exhaust valves on all cylinders.
8. Reinstall Valve Covers: Once all valves are adjusted, reinstall the valve covers and their bolts, tightening them to the manufacturer's specified torque.
9. Reconnect Battery: Reconnect the negative battery terminal.
10. Start and Check Engine: Start the engine and listen for any unusual noises. If you hear any ticking or knocking, recheck your valve adjustments.
Important Considerations:
* Shop Manual: The information above is a general guide. You absolutely *must* have a shop manual specific to your Oldsmobile 350's year and engine code. It will contain the precise specifications and procedures.
* Hydraulic Lifters: Some Oldsmobile 350 engines use hydraulic lifters, which automatically adjust valve lash. If your engine has hydraulic lifters, valve adjustment is typically not required unless there's a problem.
* Professional Assistance: If you're not comfortable with this process, take your vehicle to a qualified mechanic. Improper valve adjustment can cause serious engine damage.
This is a complex procedure requiring precision and knowledge. If you are not experienced with engine repair, seeking professional help is strongly recommended. The cost of a mechanic's labor will be much less than the cost of repairing engine damage caused by improper valve adjustment.
