Methods (in increasing order of invasiveness):
1. Engine Flush (Least Invasive): This is the first and best attempt. Use a reputable engine flush product designed to dissolve sludge and deposits. Follow the product instructions precisely. This involves adding the flush to the engine oil, running the engine for a short period (typically 15-30 minutes), and then changing the oil and filter. Repeat this process if necessary. While this might not fully free *severely* stuck valves, it can help loosen some of the buildup.
2. Soaking (More Invasive): If the engine flush doesn't work, you'll likely need to remove the cylinder head (requiring significant mechanical skill and tools). Once the head is off, you can soak the valves and valve guides in a solvent designed for removing carbon deposits. Common solvents include penetrating oil (like PB Blaster), carburetor cleaner, or even a dedicated valve cleaning solution. Soaking for several hours or even overnight can help loosen the sludge. Be extremely careful not to damage valve seals or valve guides.
3. Manual Removal (Most Invasive): After soaking, you may need to manually free the valves. Use a valve spring compressor to compress the springs, then carefully pry the valves open using a suitable tool (a valve lifter is ideal, but a carefully applied flathead screwdriver can work in a pinch – use extreme caution to avoid damage). Work gently to avoid bending or damaging the valves. Clean the valve stems and guides thoroughly with a brush and solvent.
4. Valve Grinding/Lapping (Advanced): If the valves are severely pitted or damaged from sludge, you might need to have them ground or lapped by a professional machinist. This restores a proper seal and ensures smooth operation.
5. Valve Replacement (Last Resort): In the worst-case scenario, the valves might be too damaged to salvage. You'll then need to replace them. This is a significant undertaking and requires considerable mechanical expertise.
Important Considerations:
* Engine Type: The specific procedure will vary depending on the engine type (e.g., overhead valve, overhead cam). Consult a workshop manual specific to your 1400cc engine model for detailed instructions.
* Tools: You'll need various tools, including wrenches, sockets, a valve spring compressor, and possibly a valve lifter.
* Professional Help: If you're not comfortable performing these tasks yourself, take your engine to a qualified mechanic. Improperly attempting valve repair can cause significant damage to your engine.
* Prevention: Regular oil changes with high-quality oil are crucial to preventing sludge buildup in the future.
Before starting any of these procedures, thoroughly research the specific requirements for your engine model. A service manual for your particular vehicle will be invaluable. Remember, safety and taking your time are paramount. Rushing the job could result in expensive engine damage.
