Rotor O-ring
(or optional Coro-Seal)
Groove
Step 2
Remove the old seal.
The seat adapter plate can be removed using a bearing
cap bolt as a puller. Disregard the old adapter plate O-ring,
seat, and seat O-ring. Remove and discard the rest of the
old seal. Thoroughly clean all surfaces that contact O-rings.
Use fine emery or crocus cloth. The shaft under the seal
O-ring should be shiny smooth. Lubricate all surfaces with
a clean, light oil. Do not let dirt settle on the parts.
Caution: Mechanical seals are precision devices.
Care must be used when handling and installing
the seal seat to prevent chipping or cracking.
Step 3
Proper alignment of the new seal.
This is the most critical step of the seal installation. With clean
hands unwrap the new seal without touching the seal faces.
A. Locate the notch on the back of the retainer assembly
and position over the shaft drive pin as shown in the
illustration. If the shaft drive pin is not aligned with the
notch, the seal will be
improperly positioned
and leak. It should not
require any force to install
the retainer assembly.
Hold the carbon rotor
without touching the
lapped face; lubricate
the rotor O-ring with a
light oil and install both
on the pump shaft. (For
the optional PTFE Coro-
Seal installation, see the
following paragraph.)
If you are using the optional PTFE Coro-Seal, make sure
the shaft is very clean and smooth as the PTFE seal is not
as tolerant of surface blemishes as rubber O-rings. After
lubricating the Coro-Seal, install in the backside of carbon
rotor with the spring toward you and slide the carbon rotor
in position as previously described.
Watch alignments A and B!
B. The two grooves in the carbon rotor must line up with
the drive indentations in the retainer assembly. If they
do not, the seal will be improperly positioned and
leak. Do not allow the carbon rotor to cock. This may
chip the lapped face.
11
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