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  #1  
Old 06-28-2014
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Packing gland question

Hi all.
I replaced the packing in my PSC 34 and used the special lube in it.
Getting the nut set to the right tension is proving frustrating.
With the nut set to give the target 2~3 drips/min in forward, it will drip a lot when not turning.
With the nut set to not drip when the shaft is not turning, I get no drips when in forward. Leaving it like this and doing a 1.5 hour engine run, the gland did not get hot but still no drips and it is squeeking at the end of this run when turning at ~2k/min rpm.
The difference in nut tension between the two states described is less then 1/2 a turn. Also the gland seems to drip a lot in reverse.
Should I leave it as is? Back off to get some drips and live with the leakage when the shaft is stopped? Thanks for any advise.
Regards, David
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Old 06-29-2014
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Re: Packing gland question

What was the special lube? Perhaps going back to standard would work better?

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Old 06-30-2014
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Re: Packing gland question

what did you use for packing material? Mine drips not at all when not turning and just a few drips a minute when turning. I used the Gore Tex GFO Fiber 3/16" packing.
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Old 06-30-2014
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Re: Packing gland question

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Originally Posted by dead_short View Post
With the nut set to give the target 2~3 drips/min in forward, it will drip a lot when not turning.
This seems surprising. Did you check for excessive scoring on the shaft? Is there possibly a crack or other defect on the nut? This is probably a good question to cross-post to the engine forums if you have not already.
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Old 06-30-2014
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Re: Packing gland question

As long as it's not getting hot, you're not doing any damage. I say tighten her down a bit. I have had similar issues in the past and they were due to the shaft being out of alignment. If it's not perfectly in the center of the log, it'll never work right. Make sure you're aligned and that your cutlass bearing(s) are still viable.

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Old 07-18-2014
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Re: Packing gland question

I remembered reading this post a bit ago and appreciated the information. The yard at Sail Harbor in Savannah replace my packing with the new teflon packing. On the trip down to Florida, I noticed steady dripping when running in forward and nothing when stopped. I was satisfied with the rate and figured it would improve.

I checked the drip rate the other day and found that I was not getting any drip whatsoever. I immediately felt the shaft and found it to be cool to the touch and I did not notice any unusual sounds.

Should I just be thankful or should I back off the packing nut an 1/8 of a turn and see what happens. I do not want to have the shaft scored or damaged from not having the proper amount of coolant. Thanks.
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Old 07-19-2014
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Re: Packing gland question

Be thankful. The mechanism of damage is friction which wears away at the shaft and creates a groove. No/little friction = no/little heat. I've used the teflon stuff before with no drips and had no issues. It is intrinsically a lower friction material, so it relies much less on the water for lubrication and cooling.

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Old 01-19-2015
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Re: Packing gland question

Hello to all. I am a recent new owner of a 1987 psc 34 (hull 89 Athenry) and am in the process of replacing the packing material. I went with the Teflon ptfe packing. Today I removed 2 rings of 1/4 inch goretex packing. Raindog and others use 3/16 inch. It's a 1 inch shaft. Should I try for three rings of 3/16 inch or stay with two rings of 1/4? I have both available but am unclear as to what is optimal. Many thanks, Nate
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Old 01-19-2015
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Re: Packing gland question

Quote:
Originally Posted by nateinmaine View Post
Hello to all. I am a recent new owner of a 1987 psc 34 (hull 89 Athenry) and am in the process of replacing the packing material. I went with the Teflon ptfe packing. Today I removed 2 rings of 1/4 inch goretex packing. Raindog and others use 3/16 inch. It's a 1 inch shaft. Should I try for three rings of 3/16 inch or stay with two rings of 1/4? I have both available but am unclear as to what is optimal. Many thanks, Nate
You absolutely MUST use the correct size. Otherwise bad things will happen.

From my experience and research I believe in old fashioned flax packing.

1: Graphite packing (black in color) is to galvanically active and will destroy your shaft while sitting at the doc unless you allow it to constantly drip at the dock.

2: PTFE packing (white in color) has the advantage of keeping things cooler BUT IF IT EVER GETS HOT the PTFE expands significantly in size and will wear rings in your shaft. Heat expansion is a big problem with this stuff.

3: Flax packing doesn't have the expansion or galvanic problems and works well. As a bonus it's the cheapest and easiest to find.

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Old 01-19-2015
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Re: Packing gland question

Quote:
Originally Posted by MedSailor View Post
You absolutely MUST use the correct size. Otherwise bad things will happen.

From my experience and research I believe in old fashioned flax packing.

1: Graphite packing (black in color) is to galvanically active and will destroy your shaft while sitting at the doc unless you allow it to constantly drip at the dock.

2: PTFE packing (white in color) has the advantage of keeping things cooler BUT IF IT EVER GETS HOT the PTFE expands significantly in size and will wear rings in your shaft. Heat expansion is a big problem with this stuff.

3: Flax packing doesn't have the expansion or galvanic problems and works well. As a bonus it's the cheapest and easiest to find.

MedSailor
In order to expand a PTFE product enough to cause damage you'd have to be so far out of adjustment that it is not even realistic.... Most "PTFE" marine packing products are not made actually from PTFE extrusion yarns, they are acrylic/PTFE impregnated or flax/PTFE impregnated. Remember despite whta the glossy ads suggests all traditional packing boxes are water lubricated even if they don't drip noticeably.

The Gore stuff is 100% a PTFE base that is extruded with graphite in the PTFE mix into PTFE/graphite yarns. IMHO there is no real need for the graphite and it only serves to create galvanic issues and shorter zinc life. They really could have achieved the same means with a true PTFE packing not a PTFE impregnated acrylic or PTFE impregnated flax...
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