Sundyne LMV-313, Instruction And Operation Manual

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Instruction and Operation Manual
30
Insert the inducer housing (6) into the diffuser
bore without the o-ring (936CA) and shims
(158F) installed. Install the crossover bar from
the shaft loading tool and torque the nut for the
proper preload. Allow firm contact between the
end of the inducer housing and the impeller. The
result should be a gap between the inducer
housing and the diffuser where the shims are
normally installed.
Measure the gap between the inducer housing
flange and the diffuser using feeler gauges.
Take readings from three points around the
flange. Average those three readings. Record
the average reading and add 0.010 inch (0.254
mm) to the gap reading. The result should
indicate the shim thickness to produce the
proper clearance. Confirm this number by
comparing it against the number in the Inducer
Housing Shim Adjustments figure.
The shim (158F) is made with 0.002 or 0.003-
inch (0.051 or 0.076 mm) thick laminations. Peel
off any layers that are not needed. Remove the
inducer housing (6) and install the shim (158F),
o-ring (936CA), and inducer housing (6) in the
diffuser.
Note: Proper shimming of the inducer housing
is critical. If not enough clearance is
allowed the result will be impeller
rubbing and hardware damage. If too
much clearance is allowed a loss of
performance will occur. A larger
clearance is preferred to hardware
damage.
Remove the shaft loading tool. If using a tapered
inducer, install and torque the inducer. For
proper torque values see the Torque Values
table. If using a straight inducer, remove the
diffuser assembly and install it in the pump case.
Install the inducer and continue with the pump
assembly.
Figure 12. Impeller Shim Adjustment