PS Magazine - TB 43-PS-570
PS, The Preventative Maintenance Monthly
ISSUE 570
MAY 2000
here’s an improved manhole cover seal available for your M149A2 400-gal
water tank that will make leaks a thing of the past.
But that seal, NSN 5330-01-317-9640, is only as good as its installation.
Here’s how to do it:
1.
Remove the manhole cover.
2.
Scrape off the old seal and toss it.
3.
Sand the outer 1
1
/
2
inches of the
underside of the cover with emery
paper.
4.
Use denatured alcohol to wash the
sanded area. Be careful not to touch
the sanded and washed area with
your bare hand. Oil or dirt from your
hand can keep the sealant from
working properly.
5.
Let the cleaned area dry.
6.
Spread a 1 inch wide band of silicone
adhesive, NSN 8040-00-118-2695, around the outside edge of the cover.
7.
Slip the seal onto the cover.
8.
Put a little more sealant around the inside of the seal where it meets the cover.
9.
Now lay the cover with the seal side down on a smooth, flat surface, such as
a work bench. Let the sealant cure for 24 hours.
10.
Rinse the cover with clean water.
11.
Install the manhole cover on
the tank.
M149A2 Water Trailer . . .
the new
seal
seals out
leaks--
if
you install it
correctly
!
PS 570
12
MAY 00
Spread silicone adhesive here
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