Howden WRV, Руководство по обслуживанию

Страница: 35 / 64

34
8.2 DISMANTLING 163 COMPRESSOR FOR MAJOR OVERHAUL
The compressor to be dismantled as per procedures for Annual Inspection under Section 7.3
then proceed:
Checking Journal Bearing Clearance (163mm)
At this point in the dismantling procedure the journal bearing clearance should be checked to
determine whether the journal bearings need to be replaced as part of the compressor overhaul.
Ensure the thrust retaining plate on the WRV163 compressor is removed (Figs. 33-34).
Fig. 33 Fig. 34
Procure a piece of round bar ½” (13mm) diameter and approximately 14” (355mm) long. Set up a
dial indicator in a convenient position on the main casing to allow the spindle of the dial indicator to
lie on the rotor or rotor locknut.
Set the dial indicator to zero.
Insert the short piece of bar into the hole on the end of the rotor shaft.
By raising and lowering the bar, a reading is shown on the dial indicator. This reading is the shaft lift,
by removing 0.001” (0.025mm) from this reading because of the angle of lift, you are left with the
bearing clearance.
Check this figure against the table of bearing clearances shown on Fig. 35.