John H. wrote:
On Mon, 28 Jul 2008 13:24:54 -0700 (PDT), JimH wrote:

On Jul 28, 4:20 pm, hk wrote:
Chuck wrote:
I know... I only post when I have a problem. This happened two weeks
ago. The bolt on the front outer piling holding the boat lift cradle
pulley sheared right off and the boat went in the drink. Photos of the
boat, the bolts, and some telltale corrosion streaks are stored at the
links below.
www.thespaceexplorers.com/corrodedbolts3.jpg (boat in water)
www.thespaceexplorers.com/corrodedbolts1.jpg (3/4 galv. bolts corroded
away to nothing)
http://www.thespaceexplorers.com/cor...olts2.jpg(bolt rust stains on pulley
housing)
OK. So my question is.......... is there any way to diagnose a
galvanized bolts integrity before it rusts through like this again? I
can't seem to find my portable X-ray machine. I also can't quite
figure out how to do a simple swapout on the other three. I don't know
anybody who swaps their lift bolts out every few years!
Chuck
Since apparently no one was injured, the important questions:

Was the boat damaged? Will your insurance cover any damages to the boat
or the lift?

Maybe you need to check the area for stray electrical currents...and
also change all the bolts and use nuts and bolts you can swap out every
season.
I have seen bolts looking like that taken off a wooden roller coaster
being restored. A friend of mine was helping with the restoration.
In this case constant friction and tension was the problem.

As a side note: Chuck, no offense but I can understand why you posted
the question here and not at your place. ;-)

Your place?

Wow. Warp17 is dumber than I thought. He thinks he's talking to the
guy that binned him?

"Short Wave Sportfishing" wrote in message
...
On Mon, 28 Jul 2008 20:14:30 GMT, "Chuck" wrote:

I know... I only post when I have a problem. This happened two weeks ago.
The bolt on the front outer piling holding the boat lift cradle pulley
sheared right off and the boat went in the drink. Photos of the boat, the
bolts, and some telltale corrosion streaks are stored at the links below.

www.thespaceexplorers.com/corrodedbolts3.jpg (boat in water)

www.thespaceexplorers.com/corrodedbolts1.jpg (3/4 galv. bolts corroded
away
to nothing)

www.thespaceexplorers.com/corrodedbolts2.jpg (bolt rust stains on pulley
housing)

OK. So my question is.......... is there any way to diagnose a galvanized
bolts integrity before it rusts through like this again? I can't seem to
find my portable X-ray machine. I also can't quite figure out how to do
a
simple swapout on the other three. I don't know anybody who swaps their
lift bolts out every few years!

I'm probably wrong, but that looks like electrolysis. Which means
that you have some kind of current leakage somewhere - maybe from a
shore charger?

Is your boat isolated from shore side current?

How about adding some zincs?

It could also be a case of disimular metals causing this accelerated
corrosion.

Marty

On Jul 28, 4:14*pm, "Chuck" wrote:
I know... I only post when I have a problem. *This happened two weeks ago.
The bolt on the front outer piling holding the boat lift cradle pulley
sheared right off and the boat went in the drink. *Photos of the boat, the
bolts, and some telltale corrosion streaks are stored at the links below.

http://www.thespaceexplorers.com/cor...lts3.jpg*(boat in water)

http://www.thespaceexplorers.com/cor...olts1.jpg*(3/4 galv. bolts corroded away
to nothing)

http://www.thespaceexplorers.com/cor...olts2.jpg(bolt rust stains on pulley
housing)

OK. *So my question is.......... is there any way to diagnose a galvanized
bolts integrity before it rusts through like this again? * I can't seem to
find my portable X-ray machine. * I also can't quite figure out how to do a
simple swapout on the other three. *I don't know anybody who swaps their
lift bolts out every few years!

Chuck

On Jul 28, 8:15*pm, DK wrote:
John H. wrote:
On Mon, 28 Jul 2008 13:24:54 -0700 (PDT), JimH wrote:

On Jul 28, 4:20 pm, hk wrote:
Chuck wrote:
I know... I only post when I have a problem. *This happened two weeks
ago. The bolt on the front outer piling holding the boat lift cradle
pulley sheared right off and the boat went in the drink. *Photos of the
boat, the bolts, and some telltale corrosion streaks are stored at the
links below.
http://www.thespaceexplorers.com/cor...olts3.jpg(boat in water)
www.thespaceexplorers.com/corrodedbolts1.jpg(3/4 galv. bolts corroded
away to nothing)
http://www.thespaceexplorers.com/cor...2.jpg(boltrust stains on pulley
housing)
OK. *So my question is.......... is there any way to diagnose a
galvanized bolts integrity before it rusts through like this again? * I
can't seem to find my portable X-ray machine. * I also can't quite
figure out how to do a simple swapout on the other three. *I don't know
anybody who swaps their lift bolts out every few years!
Chuck
Since apparently no one was injured, the important questions:

Was the boat damaged? Will your insurance cover any damages to the boat
or the lift?

Maybe you need to check the area for stray electrical currents...and
also change all the bolts and use nuts and bolts you can swap out every
season.
I have seen bolts looking like that taken off a wooden roller coaster
being restored. *A friend of mine was helping with the restoration.
In this case constant friction and tension was the problem.

As a side note: *Chuck, no offense but I can understand why you posted
the question here and not at your place. *;-)

Your place?

Wow. *Warp17 is dumber than I thought. *He thinks he's talking to the
guy that binned him?

That should be..........."the guy *WHO* binned him"

Stupid is as stupid does.

Eh?

"Chuck" wrote in news:GMpjk.273665$yE1.249046@attbi_s21:

I don't know anybody who swaps their
lift bolts out every few years!


We do now!

On Mon, 28 Jul 2008 20:14:30 GMT, "Chuck" wrote:

I know... I only post when I have a problem. This happened two weeks ago.
The bolt on the front outer piling holding the boat lift cradle pulley
sheared right off and the boat went in the drink. Photos of the boat, the
bolts, and some telltale corrosion streaks are stored at the links below.

Chuck, does that bolt serve as the axle for the cradle pulley? If so
you want to find new ones that are hollow with a grease fitting on the
end. My lift is set up that way and being able to grease them
periodically eliminates a lot of friction between the axle and the
pulley. It minimizes corrosion also.

Check picture #11 for an example:

http://www.landandseamarine.com/lifts2.htm

The way you replace them is to take the boat off the lift, raise the
cradle, temporarily bolt 2 x 10s between the inner and outer pilings,
and then lower the cradle onto them. That takes the load off the
cables so you can replace the pulleys, axles, etc. Take a hard look
at the cables at the same time.

On Mon, 28 Jul 2008 22:03:57 +0000, Chuck wrote:


Yep... its a different Chuck here. Too embarassed to remind everyone
what I asked last go-around. Just to clarify, here is a link to a
picture of the lift sheave bracket. I like the idea of replacing the old
galvanized 3/4" bolts with stainless steel ones. I am trying to figure
out how I can do this myself without enlisting a boat lift company who
will charge me BIG $$$$ for replacing the bolt on the other side. Have
you heard of this happening very much????

That piling looks rather new. The problem you *might* be having is with
the new pressure treated preservatives, ACQ or the like. There is a lot
more copper in them. Zinc is anodic to copper. At a minimum you should
be using hot dipped galvanized. If you use stainless, be careful, not
all stainless will work as planned.

http://www.strongtie.com/productuse/ptwoodfaqs.html

On Mon, 28 Jul 2008 18:11:25 -0700 (PDT), "
wrote:

It could also be a case of disimular metals causing this accelerated
corrosion.

Marty

On Jul 28, 4:14*pm, "Chuck" wrote:
I know... I only post when I have a problem. *This happened two weeks ago.
The bolt on the front outer piling holding the boat lift cradle pulley
sheared right off and the boat went in the drink. *Photos of the boat, the
bolts, and some telltale corrosion streaks are stored at the links below.

http://www.thespaceexplorers.com/cor...lts3.jpg*(boat in water)

http://www.thespaceexplorers.com/cor...olts1.jpg*(3/4 galv. bolts corroded away
to nothing)

http://www.thespaceexplorers.com/cor...olts2.jpg(bolt rust stains on pulley
housing)

OK. *So my question is.......... is there any way to diagnose a galvanized
bolts integrity before it rusts through like this again? * I can't seem to
find my portable X-ray machine. * I also can't quite figure out how to do a
simple swapout on the other three. *I don't know anybody who swaps their
lift bolts out every few years!

Chuck

I wondered if there might be a reaction between the zinc coating and the
chromium copper arsenate in the treated lumber. Lo and behold:

http://www.fpl.fs.fed.us/documnts/pdf1987/baker87a.pdf

Look at the comparisons between galvanized, aluminum, and stainless steel
rates of corrosion when in treated wood.

On Jul 28, 4:24*pm, JimH wrote:
On Jul 28, 4:20*pm, hk wrote:





Chuck wrote:
I know... I only post when I have a problem. *This happened two weeks
ago. The bolt on the front outer piling holding the boat lift cradle
pulley sheared right off and the boat went in the drink. *Photos of the
boat, the bolts, and some telltale corrosion streaks are stored at the
links below.

http://www.thespaceexplorers.com/cor...lts3.jpg*(boat in water)

http://www.thespaceexplorers.com/cor...olts1.jpg*(3/4 galv. bolts corroded
away to nothing)

http://www.thespaceexplorers.com/cor...2.jpg(boltrust stains on pulley
housing)

OK. *So my question is.......... is there any way to diagnose a
galvanized bolts integrity before it rusts through like this again? * I
can't seem to find my portable X-ray machine. * I also can't quite
figure out how to do a simple swapout on the other three. *I don't know
anybody who swaps their lift bolts out every few years!

Chuck

Since apparently no one was injured, the important questions:

Was the boat damaged? Will your insurance cover any damages to the boat
or the lift?

Maybe you need to check the area for stray electrical currents...and
also change all the bolts and use nuts and bolts you can swap out every
season.

I have seen bolts looking like that taken off a wooden roller coaster
being restored. *A friend of mine was helping with the restoration.
In this case constant friction and tension was the problem.

As a side note: *Chuck, no offense but I can understand why you posted
the question here and not at your place. *;-)- Hide quoted text -

- Show quoted text -

Tell us, if constant tension was the problem, as you say, why? Was
every bolt in tension beyond it's design strength? Exactly what
happened to the bolt because of tension?

On Tue, 29 Jul 2008 08:30:30 -0400, Gene Kearns
wrote:

On Mon, 28 Jul 2008 18:11:25 -0700 (PDT), penned
the following well considered thoughts to the readers of rec.boats:

It could also be a case of disimular metals causing this accelerated
corrosion.

Marty


Thus..... the plastic bushings...... and a check for stray
current.....

On Jul 28, 4:14*pm, "Chuck" wrote:
I know... I only post when I have a problem. *This happened two weeks ago.
The bolt on the front outer piling holding the boat lift cradle pulley
sheared right off and the boat went in the drink. *Photos of the boat, the
bolts, and some telltale corrosion streaks are stored at the links below.

http://www.thespaceexplorers.com/cor...lts3.jpg*(boat in water)

http://www.thespaceexplorers.com/cor...olts1.jpg*(3/4 galv. bolts corroded away
to nothing)

http://www.thespaceexplorers.com/cor...olts2.jpg(bolt rust stains on pulley
housing)

OK. *So my question is.......... is there any way to diagnose a galvanized
bolts integrity before it rusts through like this again? * I can't seem to
find my portable X-ray machine. * I also can't quite figure out how to do a
simple swapout on the other three. *I don't know anybody who swaps their
lift bolts out every few years!

Chuck

I like that plastic bushing idea.