Are any greases not dielectric, or are some labeled as such because that is
the only quality they have , i.e., no lubricating quality ?

I have used a dielectric grease where it was suggested to me, to ensure a
good electrical connection for a ground, or so I thought.

So when I secure a zinc to my saildrive should the bolts be coated with
dielectric grease, or any grease, or no grease ?

The shop manual for the yanmar sd20-31 drives suggests using threebond
1215 on the bolts for the zinc... There should be full contact between
the zinc and the saildrive anyway -- I always hit both with a bit of
emery paper before I put them together.

-- Tom.

Thanks Tom, I hadn't seen this. I haven't heard of three bond before either,
but will check it out.

wrote in message
oups.com...
The shop manual for the yanmar sd20-31 drives suggests using threebond
1215 on the bolts for the zinc... There should be full contact between
the zinc and the saildrive anyway -- I always hit both with a bit of
emery paper before I put them together.

-- Tom.

This logic is what has prompted my question. Perhaps if the bolts are drawn
up tight, there will be good electrical contact, and the grease prevents
corrosion that could insulate the connection ??


"Mys Terry" wrote in message
...
Dielectric means "non-conductive" If you put dielectric grease on a zinc,
it
won't protect anything. Zincs MUST have direct metal to metal contact to
be
effective.

Just to be clear, the threebond (durlac, lanolin, sikaflex, etc) goes
on the ss bolts not the zinc. The zinc should be have metal to metal
contact with the aluminum leg.

Also, threebond 1215 is an auto parts kind of thing. Yanmar recommends
it for bedding just about everything but volvo has some kind of marine
stuff that they prefer.

-- Tom.

Right.
And thanks, that will save me some time looking for it. But actually I
already have Lanocote, which is the other product I considered using.

wrote in message
oups.com...
Just to be clear, the threebond (durlac, lanolin, sikaflex, etc) goes
on the ss bolts not the zinc. The zinc should be have metal to metal
contact with the aluminum leg.

Also, threebond 1215 is an auto parts kind of thing. Yanmar recommends
it for bedding just about everything but volvo has some kind of marine
stuff that they prefer.

-- Tom.

Well, I knew that is what dielectric meant to begin with, so wanted
clarification as to how it could help, in this situation.

"BF" wrote in message
...
Reread Mys Terry's post:

di·e·lec·tric (d-lktrk) KEY

NOUN:

A nonconductor of electricity, especially a substance with electrical
conductivity of less than a millionth (10-6) of a siemens.
Dielectric grease in electronics is used to create a good thermal path and
a
very not good electrical path.
BF



"Garland Gray II" wrote in message
news:gy4Rf.2729$3k1.1227@dukeread03...
This logic is what has prompted my question. Perhaps if the bolts are
drawn
up tight, there will be good electrical contact, and the grease prevents
corrosion that could insulate the connection ??


"Mys Terry" wrote in message
...
Dielectric means "non-conductive" If you put dielectric grease on a
zinc,
it
won't protect anything. Zincs MUST have direct metal to metal contact
to
be
effective.