How to Change a Toilet Syphon Unit

Did you know that about 8% of the UK’s toilets are either leaking or cannot flush? This leads to wastage of millions of water. A toilet that is not flushing is one of the frustrating problems you’ll encounter in most homes. Nobody wants to use a toilet that does not flush properly; It gets annoying when pushing the handle but the waste won’t just go away.

In most cases, this problem is caused by the syphon not opening. You might be wondering what a toilet syphon is.

What is a toilet flush syphon, how does it work?

When you flush the toilet, water is pushed up and down a syphon tube using a one-way diaphragm. A syphon is a tube that carries water or liquids from their storage down to a lower level. Liquids are forced into the tube by suction or immersion. When the toilet is flushed, a syphon is created and using the weight of water falling into the toilet, more water is sucked from the cistern. The one-way diaphragms get old after some years of flushing the toilet, and they may get weak and develop holes. Others get old and break down. When this happens, they need a replacement.

How to replace a toilet syphon

Your toilet failing to flush is normal, and many people experience that, so there is no need to be scared. However, replacing a toilet syphon might not be an easy task, and it can be time-consuming, especially if you have never done it before. Since it is something you have to do to correct the damage, these simple instructions will make your work easier. Before beginning the process of replacing, check to see the type of the existing syphon first. Checking is important because there are different types of syphons. Some have two parts, and they can be split to be serviced differently.

  • Open the toilet lead and ensure you handle it with care because they easily break. Your toilet’s syphon needs to be replaced if you flush the toilet and it does not flush. You first need to get rid of the water going to the toilet. This can be done by separating the valve or lifting the handle to flush the water out of the cistern into the toilet. Incase your syphon is completely spoiled, you can use a container to empty the water. Use a piece of cloth to suck the remaining water or a sponge and rinse them in the toilet bowl to remove the water. The cistern should be empty.
  • Ensure you disconnect any water flow before doing anything else. Now use a spanner and open the nut that joins to the water inlet valve. While removing the valve, some water will drip, so do not be shocked.
  • Look for two wing nuts underneath the toilet. These two hold the cistern to the pan, and they need to be removed. If they are difficult to remove, use a hacksaw to saw them off. You can also cut them with an angle grinder.
  • Check for all the fixings that are holding the cistern to the wall and undo them. Now lift the cistern away from the toilet pan. Look at the place where the cistern connects the toilet pan and clean any dirt that might have built up there. This dirt can affect the seal later, even if it is not affecting it now.
  • Split the water inlet valve to make the fitting of the syphon easier and disconnect the C-link that joins the lever to the syphon.
  • Get a new seal kit for the toilet, which you will require when returning the cistern to the toilet pan.
  • There is a rubber donut washer. Remove it. Use a water pump pliers to undo the large nut that is at the bottom of the syphon. Now remove the syphon from the cistern and use a damp cloth to clean it so that there will be a good seal with the new syphon. The syphon comes with a sealing washer and a flanged nut. Also, note that you are not supposed to apply any silicon to the seals.
  • Now slide the rubber washer through the syphon and connect it to the cistern. Fasten the bolt that holds the cistern on the other side. This is one side of the syphon, so remember to screw back the other side.
  • Use a tape measure to make sure that everything is in line. The bolt holding the plate should be straight to make work easier when fitting it to the toilet pan.
  • Fasten the flanged nut up to the bolt that is holding the plate. Use a marker to mark around the plate so that you can notice any movement of the bolt holding the plate. The movements will help you know if it needs more tightening or it is well in its place. Use the water pump pliers to tighten the nut. A water pump pliers will ensure everything is tightly fixed.
  • Take the new donut washer and push it over the bottom of the syphon. Put the two bolts in their place and place the cistern back to the toilet pan carefully.
  • Ensure washers are placed on the bolts before the wingnuts before tightening the wing nuts. Now put the cistern back to the wall. Look keenly to ensure that all the holes are sealed, and none of them can leak.
  • Return the water supply to the cistern. Use a container to fill the cistern with water while checking to see any leakages. If there was an overflow pipe, reconnect it back and flush the toilet while still checking for any leaks. Look for the last time to ensure there are no leaks and to make sure water is flowing well to the cistern.
  • Now close the cistern with the lead carefully.

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