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Old 10-16-2005, 06:01   #1 (permalink)
Joe
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Clutch Pedal Problem on 1972

I have a 1972 Mustang with a 4-Speed Toploader. The clutch pedal does
not return by itself all of the way. After I depress it to the floor
and then remove my foot, the pedal only returns about 3/4 of the way
back. I have to put my foot under the pedal and pull it back up and
then it "pops" back to the returned position. Any ideas what causes
this?

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Old 10-16-2005, 07:01   #2 (permalink)
Bill S.
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Re: Clutch Pedal Problem on 1972

Joe wrote:
> I have a 1972 Mustang with a 4-Speed Toploader. The clutch pedal does
> not return by itself all of the way. After I depress it to the floor
> and then remove my foot, the pedal only returns about 3/4 of the way
> back. I have to put my foot under the pedal and pull it back up and
> then it "pops" back to the returned position. Any ideas what causes
> this?
>

Time to replace the spring under the dash?

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Old 10-16-2005, 14:01   #3 (permalink)
Joe
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Re: Clutch Pedal Problem on 1972

There's a return spring? That's what causes it to return?

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Old 10-17-2005, 10:01   #4 (permalink)
Cory Dunkle
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Re: Clutch Pedal Problem on 1972

Yep, I had the same problme with my '63 Falcon, and now with my '83 F-150.
The problem with the F-150 just started after last night though... I sorta
put half the cab under water and it filled up. heh heh Oops! All I gots to
say is they sure aint kidding when they say "Built Ford tough!"

As for the clutch return spring though... Try lubricating the clutch
linkage. Hit any pivot/contact points with silicon lube spray, or even
better, take the linkage apart and use grease. Should at the very least make
your clutch feel easier and much smoother.

Cory

"Joe" <lanser1996@joltmail.net> wrote in message
news:1129491743.629492.20400@g44g2000cwa.googlegroups.com...
> There's a return spring? That's what causes it to return?



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Old 10-17-2005, 10:01   #5 (permalink)
one80out@hotmail.com
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Re: Clutch Pedal Problem on 1972

The spring under the dash is actually extended with the pedal at rest.
It's there to assist with de-clutching effort. Therefore it relaxes
(becomes less extended) as you move the clutch pedal towards the floor.
When you release the clutch, it becomes extended and the force it is
exerting on the clutch pedal is to move it toward the floor, not away.

Also, these things are so massive I doubt if they ever wear out. The
hooks in the pedal and the pedal support do get worn. But this wear
would mean only that the spring is less extended when the pedal is a
rest, and/or that it becomes completely relaxed at an earlier point in
the de-clutching motion than it would if the hooks were not worn.

The fact is that you can remove these springs completely -- many do,
and in fact the installation instructions for Centerforce clutches tell
you to do so -- without affecting the ability of the clutch pedal to
return to a proper height at rest.

What is supposed to return your clutch pedal to rest is the pressure
plate. The springs or the diaphragm in your pressure plate are what
clamp the clutch disk to the flywheel. If these components got worn
out, your clutch would be slipping uselessly long before they had
reached the point that they were unable to return the clutch pedal to
rest.

My guess, therefore, is that there's a binding happening somewhere in
the clutch linkage. First guess would be the pivots in the pedal
support. The OE setup is a swedged pot metal bushing that gets
egged-out over the years, which then gives way to similar wear on the
pedal support. The cure is a rollerizer kit for the pedal support.
Scott Drake makes a good one, available from most Mustang parts houses.
Another guess would be the nylon bushings on the frame bracket for the
Z bar, or the engine mounted one.

180 Out

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Old 10-17-2005, 12:01   #6 (permalink)
Big Al
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Re: Clutch Pedal Problem on 1972


<one80out@hotmail.com> wrote in message
news:1129566687.375192.158930@g49g2000cwa.googlegroups.com...
> The spring under the dash is actually extended with the pedal at rest.
> It's there to assist with de-clutching effort. Therefore it relaxes
> (becomes less extended) as you move the clutch pedal towards the floor.
> When you release the clutch, it becomes extended and the force it is
> exerting on the clutch pedal is to move it toward the floor, not away.
>


You are 180 out:) It is an over center spring. It's fully extended when the
pedal is about 1/2 way down. It helps depress the pedal after 1/2 way when
it gets hard, AND, holds it against the stop when the pedal is up.

Al # 35


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Old 10-17-2005, 12:01   #7 (permalink)
one80out@hotmail.com
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Re: Clutch Pedal Problem on 1972

Thank you for the correction. I think I am only about 90 degrees out,
however, because it is still true that the under dash spring is not
extended at the bottom of pedal travel. If it's also true that it is
extended at the midway point of pedal travel and comes back to a rest
state at the top of pedal travel (the "at rest" position), then I was
wrong to say that it has no role in returning the pedal to a proper
height at rest.

I still have to wonder if a worn spring is Joe's problem. These springs
are so massive it's hard to believe they could wear out. However, the
mounting hooks could become so worn that the spring returns to an
unextended state long before the pedal returns to its at rest position.

The thing I also have to wonder about is, how come all of us who have
eliminated the spring have no problem with the pedal not returning to a
proper height?

Really, though, the bottom line is that if you and Bill S. have fixed
pedal height problems by replacing the under dash spring, then maybe
that is Joe's problem and that's what he ought to do. I don't want to
get into a debate about who's right or who's wrong, I just would like
it if Joe could fix his problem.

180 Out

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Old 10-17-2005, 17:01   #8 (permalink)
Big Al
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Re: Clutch Pedal Problem on 1972


<one80out@hotmail.com> wrote in message
news:1129574120.738870.137110@f14g2000cwb.googlegroups.com...


> The thing I also have to wonder about is, how come all of us who have
> eliminated the spring have no problem with the pedal not returning to a
> proper height?


Agreed, you're only 89 out. If you remove the spring the pedal will only
come up as far as the pressure plate returns it. Or, where the normal place
where you check the free play is. Hope that makes sense. Anyway, with no
spring the clutch pedal is lightly pressing on the throw out bearing. The
pedal will sometimes rattle or buzz.

Al # 35


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Old 10-17-2005, 18:01   #9 (permalink)
one80out@hotmail.com
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Re: Clutch Pedal Problem on 1972

Hey, thanks for the extra degree.

It's my admittedly limited experience with these Z-bar linkages that
the amount of pedal travel between "at rest" to "jammed down against
the floorboards" is just a little more than enough to cover the range
from having the clutch fully engaged to clutch released far enough to
make a shift, or to put the thing in gear, without grinding the gears.
Anyway, it works for me and everyone else to rely on the pressure
plate, without the under dash assist spring, to control pedal return.

So my first thought about Joe's problem is that he needs to adust his
linkage tighter, so that the pressure plate could do that job. (By the
way, in a stock setup there should be a much lighter gauge spring
connected to the clutch fork, that holds the throwout bearing off the
pressure plate fingers or diaphragm when "at rest." This spring also
helps to hold the entire linkage taut, and it's supposed to prevent the
buzzing you mentioned.) But he mentioned that his pedal can be pulled
up that little bit more and that it will then stay there -- which I
take it to be that it is the assist spring that it holding it there.
All in all, Joe's description suggested the possibility of a binding in
the clutch mechanism, not a worn out assist spring. The fact that he
does not mention problems with gear grinding suggests that his linkage
is adjusted, at least well enough to do the job it's supposed to do.

Temporarily, but not for long, 89 Out

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Old 10-17-2005, 23:01   #10 (permalink)
JohnJohnsn@mindspring.com
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Re: Clutch Pedal Problem on 1972

Joe wrote:

> I have a 1972 Mustang with a 4-Speed Toploader. The clutch pedal does
> not return by itself all of the way. After I depress it to the floor
> and then remove my foot, the pedal only returns about 3/4 of the way
> back. I have to put my foot under the pedal and pull it back up and
> then it "pops" back to the returned position. Any ideas what causes
> this?


Worn out clutch pedal bushings.

Time to repair or replace the clutch/brake pedal support, clutch pedal
and bushings.

Drop me an e-mail if you want to know how to repair it with roller
bearings. Utlizes worn parts and lasts forever.

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