THE TOOL GUY

Q: My garbage disposal leaks off and on. I’ve put a pan under it and some days the pan is full of water and then for several weeks there are no leaks. Any suggestions?

Carol M., Spokane

A: Before you do anything, I suggest that you isolate the problem by monitoring the leak and note what you were doing at the time the leak occurred. Pinpointing the problem could help save on the overall cost of the repair, whether you do the project yourself or bring in a professional.

As you monitor the situation, be open to the possibility that the garbage disposal may not be the culprit at all. There’s a lot happening under the kitchen sink, and leaks could be from the sprayer, faucet, hot and cold shut-off valves, hot water dispenser, water filter, second sink drain, or any of the connecting drainpipes underneath the sink.

However, if the disposal is the source of your leak, as you suspect, it could be leaking within the unit or from the bottom, in which case it’s time to replace it. I suggest that you try to purchase the same brand and model. With any luck, all the hookups will match.

The most common place for a leak is at the sink flange. It may have rusted through or there may be a poor seal. Water could leak from under the sink flange because the plumber’s putty there has hardened or the fiber gasket on the underside of the sink drain has deteriorated. If that’s the case, replace the plumber’s putty and fiber gasket or replace the sink flange assembly.

Water could be leaking around the mounting gasket/splash baffle, i.e., the gasket that sits between the disposal’s lower and upper mounting rings. Water could also be coming out from around the gasket at the discharge pipe (drainpipe) located on the side of the unit, or water could be leaking from the dishwasher’s inlet, also found on the side of the unit just above the discharge pipe. The solution here is to replace the mounting gasket, replace the gasket around the drainpipe, and tighten the clamp on the dishwasher’s inlet house.

It’s also possible that the gasket between the hopper and the shredder housing needs replacing (depending on the design of the unit). You might need a service tech to replace the seal.

One thing to remember about the sink flange is that you have to remove the snap ring on the underside (it’s hard to see at first) before the sink flange can be removed from the upper mounting ring. Now remove the flange from the sink and replace the seals.

Send your questions to Leon A. Frechette at C.R.S., Inc., P.O. Box 4567, Spokane, WA 99220-0567, or by email to toolguy@asktooltalk.com. Please provide a phone number in case we need to contact you about your question.