[Public-List] Damn screws

[Gordon Laco]

Hello Anders - I don’t recall that one…. sorry.


Gordon Laco
www.gordonlaco.com




> On Jun 1, 2018, at 10:20 AM, Anders Bro via Public-List <public-list at lists.alberg30.org> wrote:
> 
> And how does tuff-gel fare compared to the toilet ring seal (I do like that
> one!). I was under the impression that tuff-gel (I believe thick silicon
> grease with super fine Teflon particles. I have a small jar and it is
> incredibly tenacious.) was formulated for exactly such needs - dissimilar
> metals.
> 
> Anders
> 
> On Fri, Jun 1, 2018, 9:55 AM Gordon Laco via Public-List <
> public-list at lists.alberg30.org> wrote:
> 
>> Hello friends…
>> 
>> In our Voyager self steering vanes, we have stainless steel machine screws
>> in our cast aluminium bodies… we bed the screws in waxy grease… we’ve tried
>> many specialized compounds but have settled on what the Navy uses… that is
>> the waxy grease that comes from the hardware store in the form of the donut
>> used to seal toilet installations.  That stuff is incredibly tenacious…
>> works very well for a long time.
>> 
>> Gordon Laco
>> www.gordonlaco.com
>> 
>> 
>> 
>> 
>>> On Jun 1, 2018, at 9:49 AM, George Dinwiddie via Public-List <
>> public-list at lists.alberg30.org> wrote:
>>> 
>>> Thanks Gord and Hans,
>>> 
>>> On 6/1/18 9:06 AM, Hans Thomas wrote:
>>>> Penetrating oil and a hammer screw drive (the battery operated ones
>>>> work great but make sure the drive is well fitted to the screw).
>>> 
>>> I tried my 1/2" hand impact tool, but don't have a bit small enough to
>> fit the screw
>>> 
>>> 
>>>> When you reassemble use never seize or some other anti seize compound
>> on screws.
>>> 
>>> I generally like to do this, but wonder about the addition of more
>> metals to the mix. I've also used RTV caulk or Vaseline in a pinch. I've
>> never found anything that seems to work between stainless and aluminum.
>>> 
>>>> Whale pumps are actually a bit of a maintenance hog. I open mine up
>>>> and inspect/clean/make sure screws turn twice a year.
>>> Perhaps that's my problem. I expect things to keep working. I don't have
>> the time to rebuild everything all the time.
>>> 
>>>>> On Jun 1, 2018, at 6:00 AM, Gordon Laco wrote:
>>>>> 
>>>>> Normally I’d suggest heat - but that will destroy the rubber flap
>>>>> valve.   Are you replacing it?  Perhaps you don’t care if the valve
>>>>> that’s in place is destroyed.   I had success heating a cast
>>>>> aluminium windlass body as a step toward removing an oxidized-in
>>>>> stainless screw in the chain stripper.
>>> I'm hoping to reuse this flap valve, as it's still working. It's the
>> other one that had taken a set and quit sealing, and I seem to only have
>> one spare at the moment.
>>> 
>>> I'm taking it out so I can clean and repaint the inside of the pump
>> since I've got the unlikely circumstance of repairing it while at the dock
>> instead of at sea.
>>> 
>>>>> 
>>>>> I recall an article in a yachting magazine about fighting reluctant
>> screws…
>>>>> 
>>>>> #1 - Never let the screw ever think there is any possibility it
>>>>> might win.  It is going to lose and come out and there must never
>>>>> be any doubt about that either in your mind, or on the part of the
>>>>> screw. >> #2 - Address the screw.  Cursing is beneficial, the more
>> creativity
>>>>> the better… volume is not required, in fact silent cursing may be
>>>>> the most effective preamble of all.
>>> I've done this part well.
>>> 
>>>>> #3 - Get the screw’s attention.  Place a properly fitting screw
>>>>> driver in its head, and rap sharply with a hammer. (this is
>>>>> actually good advice because the shocks will tend to dislodge the
>>>>> aluminium oxide that is gripping it) >> #4 - soak with penetrating
>> oil, and let it sit a bit, then go back
>>>>> to #2 and proceed again until final victory.
>>> I'm wondering if the rubber flapper is preventing the penetrating oil
>> from penetrating the metal-to-metal contact.
>>> 
>>>>> #5 - apply gentle but relentless torque with your screw driver,
>>>>> sharply rapping with the hammer…be careful with the torque, you
>>>>> could break the screw.  you may be tempted to put a wrench on your
>>>>> screwdriver for leverage… this is dangerous.  A broken head means
>>>>> the screw won a round.
>>> 
>>> The screwdriver has already slipped once, slightly damaging the slot. I
>> fear that this has given the screw courage.
>>> 
>>> - George
>>> 
>>> --
>>> ----------------------------------------------------------------------
>>> When I remember bygone days                         George Dinwiddie
>>> I think how evening follows morn;            gdinwiddie at alberg30.org
>>> So many I loved were not yet dead,           http://www.Alberg30.org
>>> So many I love were not yet born.                          also see:
>>>              'The Middle' by Ogden Nash     http://idiacomputing.com
>>> ----------------------------------------------------------------------
>>> 
>>> 
>>> 
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