Low Cost Front Shock Install for Late Model Amphis

  • Thread starter Larry & Nancy Solheim
  • Start date
L

Larry & Nancy Solheim

Guest
My on-going problems and dissatisfaction with the
banging from topping (and bottoming) of the Aldan
shocks has been well documented on this group. The
culmination occurred last spring while visiting Billy
Syx enroute to Seattle from SW Florida. To finally
resolve the disturbing, loud and potentially dangerous
problem with the fronts, we replaced the recently
rebuilt (again), $300+, ?new-tech? Aldan shocks w/
some 40-year old, used original Amphi shocks.
Finally, a smooth, quiet ride over bumps and potholes.

Unfortunately, the trip westbound (including side
trips through Shenandoah, Waynesville, and the ?Fifth
& Final . . . .w/ Dave the Wave? proved too much for
the venerable parts and one was leaking (& yes,
?banging?) by the time we reached the PacNW.

The Surplus Center ATV shocks had received some good
reviews from owners of early cars with lower and upper
cross-bolt mounts, so I set out to adapt them to
Amphi, a 1966 model with the through-hull,
bayonet-type, upper mount.

Forming a ?U? bracket from 3/8? flat bar was rejected
as the form depth was larger than the required 1-1/4?
inner width, so I designed a very elegant machined
component and then rejected that as the 2pc prototype
cost was more than I was willing to spend. (Ah, to
have my ?pre-retirement? machine shop back). I
settled on modifying a piece of 2 x 2 x 1/4" wall
square tubing, by cutting out the wall with the weld
seam. 7/16? cross-holes (to match the new shock) and
a 1/2-13 tapped top hole (for the mounting stud to
Amphi) and I was in business. I ended up using 4ea
1/2" flat washers per side also to insure Amphi was
properly leveled when the adapter clevis was mounted
and the shock mount bushings were compressed. The
lower Surplus Center shock mounting bushings were
drilled out to 12mm to match the existing Amphicar
mounting hardware.

Using an air impact wrench, I installed the Surplus
Center shock into the clevis using the 7/16 bolts (to
match the shock bushing). 2ea 3/8? flat washers were
used each side of the shock as spacers for the clevis.
The air impact wrench was also used to mount the
clevis into Amphi, compressing the inner and outer
rubber mounts. 1ea rubber mount (under a flat washer)
was used inside the trunk and 2ea rubber mounts were
used between the 1/2" spacer washers and the hull.
The lower shock mount was bolted into place on the
swing arm w/ another 3/8? flat spacer washer on either
side. (You may want to look for .06?thick, 7/16
diameter flat washers for this application (or drill
3/8? washers out to 12mm) to match the Amphicar 12mm
mounting bolt. I?ll put the clevis drawing and an
simple installation cross?section into the FILES
section.

Amphi sits nice and level and (so far) after about 65
miles & 5 swims, all remains well. I am quite
impressed with the springs on the Surplus Center
shocks. They handle a fully loaded Amphi quite
nicely.

It is nice to finally have a good performing front end
and to have spent less than $75.00!

--LarryS




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R

rogtwo@aol.com

Guest
Your bracket looks like a great solution Larry. I've been wondering why no
one had done it before.

But, one question: Why did you use 2 shock bushings on the "wet" side instead
of one?

I'd also emphasize your Note 2. I think you definitely want to compress the
bushing a good bit because you don't want the bolt working up and down too
much as you hit bumps. But, you say you are compressing them to about 1/8 inch.
These start out as what, 3/4 inch bushings? That's a lot of squishing. I'd
be a bit concerned that this much compression might cause these bushings to
crack over time. But, then these are above the water line so even if the
bushings cracked a fell out, it shouldn't be a safety problem.


Roger
White '63
Seattle


[Non-text portions of this message have been removed]
 
L

Larry & Nancy Solheim

Guest
Thanks to you & Ed for comments. I'd stilI like to machine my custom bracket
and eliminate all of the flat waher spacers, so there will probably be a "phase
2" development sometime.
I considered a "hard" mount to the hull w/ just a rubber washer for sealing, but
liked the "compression seal" of the flattened bushing better. The shocks have a
rubber mounted steel sleeve for the mounting bolt, as is standard. I was
concerned about the possibility of not only bolt movement, but also fore/aft
rocking potential, but as these were exceptionally soft rubber (off the rack at
NAPA) they compressed more than expected an I can see no indication of that.
Frankly, I used 2 because I ran out of 1/2" GR8 USS FWs & needed the extra 1/8"
to make Amphi look properly level.

--Larry

rogtwo@aol.com wrote:


Your bracket looks like a great solution Larry. I've been wondering why no
one had done it before.

But, one question: Why did you use 2 shock bushings on the "wet" side instead
of one?

I'd also emphasize your Note 2. I think you definitely want to compress the
bushing a good bit because you don't want the bolt working up and down too
much as you hit bumps. But, you say you are compressing them to about 1/8 inch.
These start out as what, 3/4 inch bushings? That's a lot of squishing. I'd
be a bit concerned that this much compression might cause these bushings to
crack over time. But, then these are above the water line so even if the
bushings cracked a fell out, it shouldn't be a safety problem.


Roger
White '63
Seattle


[Non-text portions of this message have been removed]



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A

amphigr66n

Guest
--- In amphicar-lovers@yahoogroups.com, Larry & Nancy Solheim
<amphi662001@y...> wrote:
> Thanks to you & Ed for comments. I'd stilI like to machine my
custom bracket and eliminate all of the flat waher spacers, so there
will probably be a "phase 2" development sometime.
> I considered a "hard" mount to the hull w/ just a rubber washer for
sealing, but liked the "compression seal" of the flattened bushing
better. The shocks have a rubber mounted steel sleeve for the
mounting bolt, as is standard. I was concerned about the
possibility of not only bolt movement, but also fore/aft rocking
potential, but as these were exceptionally soft rubber (off the rack
at NAPA) they compressed more than expected an I can see no
indication of that. Frankly, I used 2 because I ran out of 1/2" GR8
USS FWs & needed the extra 1/8" to make Amphi look properly level.
>
> --Larry
>
> rogtwo@a... wrote:
>
>
> Your bracket looks like a great solution Larry. I've been
wondering why no
> one had done it before.
>
> But, one question: Why did you use 2 shock bushings on the "wet"
side instead
> of one?
>
> I'd also emphasize your Note 2. I think you definitely want to
compress the
> bushing a good bit because you don't want the bolt working up and
down too
> much as you hit bumps. But, you say you are compressing them to
about 1/8 inch.
> These start out as what, 3/4 inch bushings? That's a lot of
squishing. I'd
> be a bit concerned that this much compression might cause these
bushings to
> crack over time. But, then these are above the water line so even
if the
> bushings cracked a fell out, it shouldn't be a safety problem.
>
>
> Roger
> White '63
> Seattle
>
>
> [Non-text portions of this message have been removed]
>
> Larry, Roger: I found at NAPA a "Motor Mount" suitable for the
shock bushings- PN: 602-1045. Its about 3/4" thick 2" Dia. with a
7/16-1/2" hole $11.97 each. Its a strong rubber donut that does not
need doubling up. Who has that drawing for the Wheel Rims? It is not
in the Files section. Marc.
>
> THE AMPHICAR-LOVERS LIST
> ~~~~~~~~~~~~~~~~~~~~~~~
> Before posting requests for information, please check the List
> Archives:
> http://www.escribe.com/automotive/amphicar/search.html
> For more information about this List and other available services
> visit:
> http://groups.yahoo.com/group/amphicar-lovers/
> To UNsubscribe from this List, just send a blank email to:
> amphicar-lovers-unsubscribe@yahoogroups.com
> Any other issues may be addressed to the List owner (Mike Israel)
at:
> amphicar770@y...
> This list is provided as a free service. Please support our
sponsors at:
> http://www.growerflower.com/default.asp?id=41762
>
>
>
> Yahoo! Groups Sponsor
> Get unlimited calls to
>
> U.S./Canada
>
>
> ---------------------------------
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>
> To visit your group on the web, go to:
> http://groups.yahoo.com/group/amphicar-lovers/
>
> To unsubscribe from this group, send an email to:
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>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service.
>
>
>
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> [Non-text portions of this message have been removed]
 
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