Hi, I'm Vance and welcome to repair and replace.
In this episode we're going to replace the diaphragm in a Delta Tech II manual Flushometer.
This applies to both urinals and water closets as the models are nearly identical except for
the spud diameter and size.
To begin you'll need a diaphragm, a flat blade screwdriver, a Phillips screwdriver, an eight
point star bit or number three Robertson screwdriver, locking pliers,
an adjustable wrench and duct tape.
Flushometers are also known as flush valves but function quite differently from the
flush valves found in residential toilets.
In a Delta Tech II, a flexible rubber diaphragm sits between the upper and lower chambers.
At rest, high pressure water in the upper chamber keeps the diaphragm
closed tightly on the valve seat.
When the handle is pressed, the relief valve opens and releases the water
from the upper chamber.
This creates a vacuum which lifts the diaphragm up from the valve seat.
The water from the inlet then travels down the flush pipe.
As the water flows, some of the water slowly travels through the bypass and will
eventually fill the upper chamber
The flush will continue until the pressure pushes the diaphragm down once again.
If the diaphragm wears down, it can cause continuous flushing if it fails
to seal properly on the valve.
Alternatively, if the diaphragm sticks to the valve, it can prevent
the unit from flushing any water.
First, shut off the water to the flushometer, remove the cap and use a flat blade
screwdriver to turn the screw clockwise until the inlet stop closes.
Next, hold down the handle to remove any remaining water.
Remove the cover screw using an eight point star bit.
A number three Robertson
screwdriver should work as well.
Now, remove the cover.
Use a Phillips screwdriver to unscrew and remove the cast cap.
Next, remove the diaphragm guide assembly.
If you're replacing the entire assembly, you can skip the next step.
To replace the diaphragm you'll have to separate it from the guide assembly.
First, remove the poppet pin and set it aside.
Since the assembly is threaded together, it might be a little tricky to unscrew.
First, take some duct tape and wrap it around the shank to protect it.
Use a bench vise or locking pliers to secure the assembly.
Now, use an adjustable wrench to grip onto one of the tabs of the brass piece.
Turn counterclockwise and unscrew the pieces.
Separate and discard the old diaphragm.
Align the new diaphragm so the top is facing you.
The top will say this side up.
Now, drop the top piece through the hole.
Next, align the washer on the bottom piece and screw the assembly together.
Use the adjustable wrench to tighten the pieces together.
Now, remove the tape from the shank and replace the poppet pin.
Replace the assembly and align the holes.
Now, place the cast cap over top.
Make sure that the side marked handle is pointing towards the handle.
Next, tighten the mounting screws, replace the cover and tighten the cover screw.
Open the shut-off valve and replace the cap.
Finally, test flushometer and check for any leaks.
The first flush will remove the air from the system.
The second flush should function as normal.
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