Kohler K91 Owner's Manual page 240

The following photograph shows the acceleration
valves and related parts removed from the motor.
The
left has had the metering plug and ball and spring
valve at the right is complete.
The
valve shown at the
removed.
\
NOTE:
Two valves with the spring between them
and the two plugs with seals make up the
complete acceleration valve assemblies. To install,
place the spring in the end of one of the valves and
install the valve and spring assembly in one end of
the motor housing bore. Install the other valve in the
opposite end. Make sure that the spring
i s
seated in
the bores of the valves and install the two plugs.
FIG. 36.
Acceleration Valves
Install two small O-rings in the two low pressure
ports. A third small O-ring is installed around the right
front bolt hole, located at the top left corner of the
following photograph. Center a square section back
up ring on top of each of the large O-rings and install
them in the two large high pressure ports. When
properly installed the bottom of the back up rings
will
be
just below the top of the recess.
Be
very careful not to get dirt on the pad surface.
To install the motor, line it up on the two top case
bolts. Install the nuts on the
two lower cap screws.
Always use a new gasket.
FIG. 38.
Motor Installation
After the motor has been secured to the transaxle
check the seal rings to make sure they are in position.
Next, release the back of the manifold
if
it was tied
up during the motor removal. Line it up and install
the
two
3/8"
bolts and the two
1/2"
bolts. Make sure the
special seal washer i s under
the
head of the right
front bolt.
FIG. 37.
O-ring Installation
FIG.
39. Motor Installation Completed
31