How to Fix a Leaking Kitchen Sink Without Replacing the Faucet or Drain Assembly
Fixing a leaking kitchen sink without replacing the faucet or drain assembly is definitely possible, depending on the source of the leak. Follow these troubleshooting steps to address common issues without having to invest in a new fixture or drain line.
Faucet Leaks
One of the most common culprits for dripping faucets is a loose packing nut. This nut can often be tightened by turning it clockwise, but be careful not to overdo it, as over-tightening can strip the threads and cause more problems. Another common issue is worn-out washers under the handle, which can be replaced with compatible washers following the specific instructions for your faucet model.
Drain Leaks
Inspect the P-Trap for loose connections or worn gaskets. Carefully remove the P-trap and replace the gasket to ensure snug connections when reassembling. Check for loose connections between the drainpipe and the sink or tailpiece. Tighten these connections securely using wrenches.
Isolating the Problem
To isolate the source of the leak, take a close look with a bright flashlight. Water always works its way down, so start by checking the base of the faucet underneath for signs of water. Common points of leaks are where the hoses connect to the faucet inlets. Next, check the angle stop valves, also known as hot and cold valves. At the base of the handle stems, there is a nut that contains packing to seal the stems. Turning the water on or off can loosen the nut, causing a pesky drip. Turn the nut clockwise, but be careful not to over-tighten. A quarter of a turn is often sufficient.
Examining the Drain
If the above steps do not resolve the issue, proceed to the drain. Start at the base of the bowl. If it is wet, remove the pop-up assembly and reinstall a thin rope of plumber's putty where the pop-up seats against the sink bowl. If the pop-up is not the cause, follow the piping downward with cold water running until you find the source. If you have ever used a liquid drain opener on your sink, and you have metal drains, there's a good chance that the chemicals have worn the piping thin. In this case, you may need to install a new drain line, which is not expensive and can be purchased at most home improvement stores as a complete assembly.
Always remember to place a tiny bucket under the drain line when removing the old drain, as the P-trap holds a small amount of water to prevent gases from entering the space.
Most home improvement stores also have a 'how-to' book available, which I highly recommend for additional guidance. Good luck with your repair!