Sideblock Assembly Replacement - Kirby Morgan KMB-18 A/B Operation And Maintenance Manual

KMB 18 & 28 MANUAL
Fig. 6.27 The air train standoff on the KMB 28
3) Next, the screw
(25) is removed
using the stubby
screwdriver.
Fig. 6.28 Remove the alignment screw.
4) The side block assembly (120a/b) is now
unfastened, but held in place by RTV (silicone
sealant) that acts as a glue. It may be necessary to
slightly rock or pry the side block from the Band
Mask frame (17). A thin putty knife can be
pushed between the side block and the Band
Mask frame to help free it. The side block assem-
bly (120A/B) must be pulled straight out off of the
mask frame (17), not at an angle. The stud (93)
has to come through the frame and can cause
damage if the side block is forced out at an angle.
Be sure to peel or scrape the old silicone sealant
(RTV) away from both sealing surfaces before
reassembling. Lacquer thinner helps remove this,
but carefully since it will also remove the flat
black finish inside the KMB 18 Band Mask.
page 64
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© Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 010518001
Fig. 6.29 Use a thin putty knife to separate the side block
from the mask frame.
5) If you plan to rebuild the side block (94a/b), it
should be done at this time. (See Section 6.6)
6.5.3 Sideblock Assembly (120A/B)
Replacement
If a new side block is being installed, make sure
it aligns correctly in the holes of the Band Mask
frame (17) before applying RTV (silicone seal-
ant).
1) A generous application of silicone sealant
(RTV) must be applied to the side block assembly
(120a/b) prior to installation on the Band Mask
frame (17). Use only Dow Corning
cone sealant or equivalent. Care must be taken to
avoid sealant entering the air passageway in the
side block. Be sure to remove all excess silicone
sealant (RTV) before it sets up. Lacquer thinner
can be used to dissolve unset sealant.
®
#732 Sili-