Ametek EN505 Service Manual - Page 6

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Impeller Shimming Procedure:

WARNING: This unit may be difficult to shim. Extreme care may be exercised.

Tools Needed: Machinist's Parallel Bar

Vernier Caliper with depth measuring capability

Feeler gauges or depth gauge

Measure the Following:

Distance from the flange face to the housing (A)

Distance from the flange face to the motor shaft shoulder (B)

Impeller Thickness (C)

Measurements (A) and (B) are made by laying the parallel bar across the housing flange face and

measuring to the proper points. Each measurement should be made at three points, and the average

of the readings should be used.

Shim Thickness = B – (A+C)/2

After the impeller installation (step #4 above) the impeller/cover clearance can be checked with feeler

gauges, laying the parallel bar across the housing flange face. This clearance should nominally be

(A-C)/2.

Revised – February 2005