Hi Jason,
I would go with the larger size packing material.
When the gland nut is tightened the compression
pushes the outside diameter larger against the
walls of the gland and the inside diameter
smaller against the shaft. If the packing starts
too small it will compress but may not expand enough to seal.
I've packed many industrial pumps and we choose a
size that is tight, but before install compress
it slightly, with hammer taps, so it's an easy insertion.
In regards to the overheat question, it is
important to have it drip while running. Not
much, once every 30 seconds to a minute is
adequate to prevent it getting too hot. I adjust
for a warm to touch running temperature at the
beginning of the season and don't do much after
that. The wax in the flax packing cools after
shutdown and will seal it completely if you have it adjusted just right.
Cheers, Russ
Sweet 35mk-1
At 03:33 AM 5/11/2018, you wrote:
Thanks for the replies. What about the sizing
question: ¼ vs 3/16 material for a 1 shaft? What have others used?
Jason Ainslie, Spirit
1984 C&C 35-3
Bayfield, ON
From: bwhitmore [mailto:bwhitm...@sbcglobal.net]
Sent: May-10-18 11:33 PM
To: cnc-list@cnc-list.com
Cc: Ainslie
Subject: Re: Stus-List Stuffing box material
I've only put 3 rings in before, with the cuts
for each ring equidistant from one another. You should be fine.
Bruce Whitmore
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: Ainslie via CnC-List <cnc-list@cnc-list.com>
Date: 5/10/18 8:47 PM (GMT-05:00)
To: cnc-list@cnc-list.com
Cc: Ainslie <ains...@hay.net>
Subject: Stus-List Stuffing box material
Hello,
The stuffing box on my 35 Mk 3 had a steady drip
last fall, so I repacked it recently. According
to my callipers, I could use ¼ flax in the
gland nut (1 shaft). This seemed to pack in
easily enough, but I was only able to get three
rings in and still have enough threads on the
nut. However, I had pulled four rings out!
Theres no way I could get four of these
quarter-inch rings in. My question: have I made
a mistake should I have used 3/16 material?
As I mentioned, the packing seemed to fit into
the gland fairly easy with just finger-pushing,
but could this overheat the shaft, and are three
rings enough? Launch is next Wednesday, so Id
have to move quickly if I need to downsize it to 3/16. Thanks!
Jason Ainslie, Spirit
1984 C&C 35-3
Bayfield, ON
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