Instruction Sheet

IS-18158

TOILET DRAIN VALVE REPLACEMENT
First Release

06-27-2019

MATERIAL
Kit # 401294 includes the following parts:
Part No.

Description

Qty

900195

VALVE, TOILET DRAIN 3 INCH

1

401296

ADAPTER

1

5000310

SCR CAP HEX SS NSS M6X1 X 40

4

5001833

WSH BEL SPR SS 301 6.65X17.4X1.27 (M6 x 1/4)

4

IS-18158

INSTRUCTION SHEET (EN)

1

FI-18158

INSTRUCTION SHEET (FR)

1

Other material that may be required:
Part No.

Description

Qty

680098

LOCTITE 567 TEFLON 250ML

1

684685

GLUE SIMSON ISR 70-03 BLACK, CARTRIDGE

1

LOCTITE 7649 (SPRAY)

1

N8907092

NOTE
Material can be obtained through regular channels.

PROCEDURE

DANGER
Park vehicle safely, apply parking brake, stop engine. Prior to working on the vehicle, set the ignition
switch to the OFF position and trip the main circuit breakers equipped with a trip button. On Commuter
type vehicles, set the battery master switch (master cut-out) to the OFF position.
Lock out & Tag out (LOTO) must be performed during set-up, maintenance or repair activities. Refer to
your local procedure for detailed information regarding the control of hazardous energy.

Writer: mg

IS-18158
Page 2 / 8

PART 1: TOILET PREPARATION
1. Remove the toilet drain pipe from the
vehicle.
-

Flush and rinse the toilet tank.

NOTE
Ideally, this operation is done a few hours before
the valve replacement. The aim is to minimize
the presence of dripping liquid at the toilet valve
flange that could compromise sealing.
-

Loosen upper and lower pipe hose clamps.

-

Disconnect the overflow tube.

-

Remove the drain pipe.

Writer: mg

IS-18158
Page 3 / 8

2. Remove the old toilet drain valve from the
vehicle.
-

Unscrew the valve from the toilet flange
(flange may be tight, apply localized but
moderate heat with a heat gun as
required).

NOTE
Cut some insulating material around the toilet
flange to expose a few more threads and ease
cleaning as shown.

3. Clean the toilet flange threads.
-

Clean the flange thread from lose crust of
rust and adhesive using a suitable (nonaqueous) cleaner degreaser (wipe off the
excess).

-

Using a brass wire wheel brush mounted
on a high speed rotary tool, thoroughly
clean the flange threads from the
remaining rust (clean to shiny bare metal).

CAUTION
Wear appropriate eyes protection.
-

Complete the cleaning using a residue free
cleaner (break cleaner or equivalent) on
the threads.

Writer: mg

IS-18158
Page 4 / 8

PART 2: VALVE PREPARATION
1. Remove and discard the top adapter part
of the valve (with inner threads).
-

Remove the four bolts holding the top and
bottom adapters to the valve.

-

Discard the top adapter (with inner threads)
and the bolts (do not discard rubber seal).

-

Clean the top of the valve body (where the
top adapter was bolted) with brake cleaner
followed by anti-silicone; surface must be
free of assembly oil film.

2. Clean the new stainless adapter flange.
-

Clean the bottom flange of the 401296
stainless adapter with brake cleaner
followed by anti-silicone, surface must be
free of contaminants.

-

Also clean the rubber joint (oil free) and
install it (dry) on the flange.

Writer: mg

IS-18158
Page 5 / 8

3. Apply adhesive to the valve upper part
perimeter.
-

Apply heat to the valve inner perimeter with
a heat gun (try to minimise heating of the
metal sliding “gate”). The heated area must
be hot but must not distort (melt); the
plastic will start to look “wet” when the
melting temperature is about to be
reached.

NOTE
Go slowly with the heat gun set at a medium
temperature setting. Start at a safe distance from
the valve body and adjust as necessary.
In any case, do not allow the plastic to reach the
melting/distorting point.
-

Apply a bead of black Simson 70-03
adhesive at the valve perimeter (heated
area). Adhesive must be applied within 30
min. or the area will have to be re-heated.

4. Reassemble the toilet valve.
-

Install the stainless adapter (and rubber
joint) on top of the valve body. Align bolt
holes as much as possible and press
slightly to spread the Simson adhesive.

-

Reassemble the valve using the supplied
5000310 hex screws and 5001833
Belleville washers (the stainless adapter is
threaded).

NOTE
Make sure that the lower adapter rubber joint is
correctly reinstalled.
-

Torque all screws to 40 lb-in (4.5Nm) in a
cross pattern.

-

Wipe off any adhesive excess.

-

Activate the valve a few times to ensure
proper function.

Writer: mg

IS-18158
Page 6 / 8

PART 3: TOILET VALVE INSTALLATION
1. Trial fit the installation of the valve to the
flange without any sealant.
-

Make sure that once torqued in place (pipe
threads), the valve handle is pointing
straight (facing the operator).

-

If the handle is not straight, try others
starting positions 45 deg. apart until a
correct torqued alignment is achieved and
take note of it for final installation.

NOTE
Do not over torque or back up the valve to
achieve correct alignment.
Mark the starting point of the valve vs. the flange
on the valve body as necessary for future reference.
-

Remove the valve from the toilet flange.

2. Apply primer to the threads.
-

Apply
a
coat
of
Loctite
7649
primer/activator to the toilet flange and to
the stainless adaptor threads (protect
rubber joint).

-

Allow the solvent in the primer time to
evaporate until the surfaces are completely
dry (+/- 15 min.).

Writer: mg

IS-18158
Page 7 / 8

3. Apply sealant to the threads.
-

Apply a coat of Loctite 567 PST thread
sealant to the toilet flange.

-

Also apply a coat of thread sealant to the
threads of the stainless adaptor (protect
rubber joint).

NOTE
Push the sealer into the threads.

4. Screw the valve to the flange.
-

Screw the flange until a fairly tight
connection is achieved and the valve is
pointing straight at the operator.

NOTE
Use the reference mark as required (see step 1
above).

CAUTION
Do not over torque or back up the valve to
achieve correct alignment.

Writer: mg

IS-18158
Page 8 / 8

5. Reinstall the toilet drain pipe and overflow
tube.
-

Reinstall the drain pipe and related hose
clamps. Do not apply sealant at the lower
valve flange.

-

Reconnect the overflow tube and tighten
hose clamp.

6. Refill the tank and check for leak.

NOTE
For maximum pressure resistance; Before filling
the tank, allow the Loctite 567 to cure 24 hours.

PARTS / WASTE DISPOSAL
Discard waste according to applicable environmental regulations (Municipal/State[Prov.]/ Federal)

Writer: mg