That said, here's a general outline of the process. Specific details will vary depending on the engine (3.0L V6 or 3.3L V6 were common in this model). Consult a repair manual specific to your vehicle's engine for precise specifications and procedures. A factory service manual is the best source of information.
Before You Begin:
* Safety First: Disconnect the negative battery terminal.
* Gather Tools: You'll need valve adjustment tools (feelers gauges of the correct thickness), a wrench or socket set, possibly a breaker bar, and a repair manual.
* Obtain Specifications: Your repair manual will give the correct valve lash (clearance) specifications in millimeters or inches (usually expressed as "cold" settings, meaning the engine is at operating temperature).
General Procedure (Consult your repair manual for specifics):
1. Locate the Valves: Access the valve cover(s). This usually involves removing various components (air cleaner, etc.). The repair manual will show you precisely how to do this.
2. Remove the Valve Cover(s): Carefully remove the valve cover(s) after disconnecting any necessary components. Be mindful of any gaskets or seals, as these will likely need replacement.
3. Rotate the Engine: You need to rotate the crankshaft to position the pistons so you can access the valves. This is typically done using a wrench on the crankshaft pulley bolt, or sometimes a special tool on the harmonic balancer. Crucially, you must rotate the engine in the direction of normal operation. Your manual will detail how to find Top Dead Center (TDC) for each cylinder and which valves are accessible at each position. You'll need to do this repeatedly for each cylinder. This step is crucial to avoid damaging the valves.
4. Measure Valve Lash: Using your feeler gauges, check the clearance between the valve stem and the rocker arm. The engine must be at operating temperature (or "cold" depending on the specifications in your manual).
5. Adjust Valve Lash: This is done by adjusting the rocker arm using the adjustment screws or nuts. Your repair manual will specify how this is done for your engine. You need to achieve the specified clearance.
6. Repeat for All Valves: Repeat steps 3-5 for each valve on both the intake and exhaust sides of all cylinders.
7. Reassemble: Carefully reinstall the valve cover(s) with a new gasket. Reconnect all removed components.
8. Reconnect Battery: Reconnect the negative battery terminal.
9. Check for Leaks: After starting the engine, carefully check for any leaks around the valve cover.
Important Considerations:
* Hydraulic Lifters: Some engines use hydraulic lifters, which self-adjust. If your New Yorker uses these, valve adjustments are usually unnecessary unless there's a specific problem. Check your repair manual.
* Engine Temperature: Valve lash changes with temperature. The specified clearance is usually for a specific engine temperature.
* Torque Specifications: Always tighten bolts and nuts to the manufacturer's specified torque using a torque wrench. Over-tightening can cause damage.
Again, this is a simplified overview. You absolutely must obtain and consult a repair manual specific to your 1989 Chrysler New Yorker's engine before attempting this procedure. Improper valve adjustment can lead to bent valves, damaged pistons, and other serious engine problems. If you're unsure about any part of the process, seek professional help.
