Car Shakes Badly at Times...

S

skk0819

Guest
The replies to my last post were so helpful, thought I would post
another couple of my amphi problems/issues. Please remember, I am
not as mechanically gifted as most folks in this group....:)

At times, the car shakes badly. I actually think it is two separate
issues:

1. I think this is a front end issue. After hitting a bump
sometimes, the front end shakes so badly, the car is almost out of
control. The only way to make it stop is to basically stop the car,
and start out again. If there are any suggestions as to which front
end part to check (and how) that would be great.

2. Sometimes when I start out in a low gear, and releaseing the
clutch, thee is another shudder (not in the front end). The shift
lever is bucking all over the place. The tanny mounts under the back
seat look good, and they are almost 20 years old, but have less than
100 miles on them. Could this be U-Joints? Heck if I know....again
any specific suggestions/direction would be welcome...

Thanks,
Scott Kenewell
 
W

WB6WSN

Guest
----- Original Message -----
From: skk0819
To: amphicar-lovers@yahoogroups.com
Sent: Monday, August 09, 2004 6:14 PM
Subject: [amphicar-lovers] Car Shakes Badly at Times...


The replies to my last post were so helpful, thought I would post
another couple of my amphi problems/issues. Please remember, I am
not as mechanically gifted as most folks in this group....:)

At times, the car shakes badly. I actually think it is two separate
issues:

1. I think this is a front end issue. After hitting a bump
sometimes, the front end shakes so badly, the car is almost out of
control. The only way to make it stop is to basically stop the car,
and start out again. If there are any suggestions as to which front
end part to check (and how) that would be great.

2. Sometimes when I start out in a low gear, and releaseing the
clutch, thee is another shudder (not in the front end). The shift
lever is bucking all over the place. The tanny mounts under the back
seat look good, and they are almost 20 years old, but have less than
100 miles on them. Could this be U-Joints? Heck if I know....again
any specific suggestions/direction would be welcome...

Thanks,
Scott Kenewell



Scott:

For #1, you just have to check everything in the front end for looseness and
play. Everything from the swing-arm axles to the wheel bearings. And then check
the tie rod ends. And finally, do the classic check of the steering box. The
linkage may be nice and tight, but some steering boxes wiggle back and forth an
inch! You should be sure to install one of the several solutions for bracing the
steering box. And then check everything in the rear suspension too! What, you
don't have a floor jack and a creeper?!

For #2, I suggest you remove the rear seat and have someone drive the Amphi
while you watch what's wiggling. Is it the shifter shaft that's dancing, or is
the whole transmission moving? The rubber mounts can go bad, getting "squishy".
Also check the motor mounts under the engine pulley. These mounts see more heat
and oil and bilge yuck, so I would expect them to fail before the transmission
mounts fail. You may have a U-joint problem, but you have to have good mounts
before you can assess the joint condition (short of pulling the joints to check
them out of the Amphi).

The total miles on a given part is only important if the part was a good part,
and the right part. If the previous renewals were done with a part "forced to
fit", or done by a lousy mechanic, then the performance may have never been
decent. Also, your Amphi's previous owner may have been much more tolerant of
weird performance.

BTW, 20-year-old engine mounts may have rusted in place, and might be near
impossible to replace without pulling the engine. You might want to start
thinking about an engine pull to survey the problem, and then that puts you a
long way toward easily checking the U-joints, clutch and ring gear. Darn how one
thing leads to another! <g>

Ed
El Cajon
67 Rust Guppy


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

John Friese

Guest
Hello Scott,

Ed has your answer for that dangerous front end shake but your second
problem sounds to me like the "all too common" Amphicar clutch
chatter problem. When I had your problem with one of my cars I tried
several clutch rebuilders and none of their "repairs" worked. The
total solution to this problem is to upgrade your clutch to the high
performance clutch system that I developed. It uses a more stronger,
more modern clutch design and is a simple "drop in" to any Amphicar
with no alteration whatsoever to the car. There is more information
about this clutch system in a listing at:
http://www.amphicar.com/ads.htm

Enjoy,

John Friese
67 White
67 Red



--- In amphicar-lovers@yahoogroups.com, "WB6WSN" <wb6wsn@c...> wrote:
>
> ----- Original Message -----
> From: skk0819
> To: amphicar-lovers@yahoogroups.com
> Sent: Monday, August 09, 2004 6:14 PM
> Subject: [amphicar-lovers] Car Shakes Badly at Times...
>
>
> The replies to my last post were so helpful, thought I would post
> another couple of my amphi problems/issues. Please remember, I
am
> not as mechanically gifted as most folks in this group....:)
>
> At times, the car shakes badly. I actually think it is two
separate
> issues:
>
> 1. I think this is a front end issue. After hitting a bump
> sometimes, the front end shakes so badly, the car is almost out
of
> control. The only way to make it stop is to basically stop the
car,
> and start out again. If there are any suggestions as to which
front
> end part to check (and how) that would be great.
>
> 2. Sometimes when I start out in a low gear, and releaseing the
> clutch, thee is another shudder (not in the front end). The
shift
> lever is bucking all over the place. The tanny mounts under the
back
> seat look good, and they are almost 20 years old, but have less
than
> 100 miles on them. Could this be U-Joints? Heck if I
know....again
> any specific suggestions/direction would be welcome...
>
> Thanks,
> Scott Kenewell
>
>
>
> Scott:
>
> For #1, you just have to check everything in the front end for
looseness and play. Everything from the swing-arm axles to the wheel
bearings. And then check the tie rod ends. And finally, do the
classic check of the steering box. The linkage may be nice and tight,
but some steering boxes wiggle back and forth an inch! You should be
sure to install one of the several solutions for bracing the steering
box. And then check everything in the rear suspension too! What, you
don't have a floor jack and a creeper?!
>
> For #2, I suggest you remove the rear seat and have someone drive
the Amphi while you watch what's wiggling. Is it the shifter shaft
that's dancing, or is the whole transmission moving? The rubber
mounts can go bad, getting "squishy". Also check the motor mounts
under the engine pulley. These mounts see more heat and oil and bilge
yuck, so I would expect them to fail before the transmission mounts
fail. You may have a U-joint problem, but you have to have good
mounts before you can assess the joint condition (short of pulling
the joints to check them out of the Amphi).
>
> The total miles on a given part is only important if the part was a
good part, and the right part. If the previous renewals were done
with a part "forced to fit", or done by a lousy mechanic, then the
performance may have never been decent. Also, your Amphi's previous
owner may have been much more tolerant of weird performance.
>
> BTW, 20-year-old engine mounts may have rusted in place, and might
be near impossible to replace without pulling the engine. You might
want to start thinking about an engine pull to survey the problem,
and then that puts you a long way toward easily checking the U-
joints, clutch and ring gear. Darn how one thing leads to another! <g>
>
> Ed
> El Cajon
> 67 Rust Guppy
>
>
> [Non-text portions of this message have been removed]
 
A

Al Heath

Guest
Hi Scott,

#1 I'd make a quick and simple check of the toe in. A rough look can be
made with just a tape measure. With the car pointed straight ahead as it
would like to naturally travel, just pick the same relative spot on the
front tires at the front edge and then back edge and measure the distance
from the drivers side to the passenger side (or vica versa .. <G>) for the
front edge vs back edge of the tires. The simple harmonic oscillation
you've described could be a case of a large / \ or \ / situation.
In which case, check for bent worn parts and get an alignment.

#2 Clutch shudder could be the pressure plate springs showing age and not
allowing it to engage perpendicular to the flywheel. I'd probably put a in
new pressure plate and disc, etc rather than a rebuilt one. On the other
hand, If the tranny shift lever shakes a bunch at 20-30 MPH, that could be
the rear u-joints not being aligned in the same phase as the slip joint can
be assembled such that crosses ( + ) don't align to bend similiarly. Check
that by parking the car such that the outside u-joint is at a known
12-3-6-9 clock position and see if the inner joint is also 12-3-6-9 and not
at something like 10-2-5-8 o'clock.

Al

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