7
P/N 42-9551
KN Series Gas-fired direct vent cast iron boilers – Field assembly instructions
Step 8
Push nipple lubricant
Rubber gloves are recom-
mended for this procedure.
1. In a disposable container, mix some
30-wt motor oil with some of the
Hercules Pro Dope supplied with the
boiler.
2. The consistency should be similar to
thick paint and should flow easily.
3. You will need enough to lubricate all
nipple ports and all push nipples —
probably about ½ pint is enough.
Step 9
Lubricate nipple ports
1. Brush the pipe dope/oil mixture on
the inner machined surfaces of the
nipple ports.
2. Avoid getting lubricant on the sili-
cone RTV or on the face of the nipple
ports.
Step 10
Lubricate push nipples
1. Brush the entire outside surface of
each nipple port with the lubricant.
Step 11
Insert push nipples
Avoid scarring or damaging
the push nipple or nipple
port surfaces. The push nip-
ple makes a metal-to-metal
seal with the nipple port. Any
surface defects could cause a
leak.
1. Insert a push nipple into each of the
two nipple ports.
2. Seat each nipple firmly but squarely.
3. Make sure the nipple face is parallel
to the section surface as closely as
possible.
4. DO NOT attempt to assemble sec-
tions if any nipple port is mis-aligned.
