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Installed new clutch with diaphragm style pressure plate - pedal does not come back
#1
Hi guys,

my buddy and I pulled the motor out and in at the last weekend to renew my freeze plugs, flush the cooling system, change the oil pan to 7 qt and some other things including a new clutch and pressure plate.

It is a good Sachs system in diaphragm style. The problem is now that the clutch pedal often remains to stick on the floor which isn't very comfortable while driving or starting on the traffic lights... Dodgy

I have a 1973 q-code with 4-speed-manual.

So I have read a few posts like these

http://www.7173mustangs.com/thread-1973-...tch+spring

http://www.7173mustangs.com/thread-boss-...urn-spring

http://www.7173mustangs.com/thread-clutc...ist-spring

but they all do not come to a conclusion.

What should I do now?

It seems that I perhaps also have not a second clutch pedal assist spring that mounts to the side of the pedal box (of which I heard in a thread) if there ever was one on mine. I have only the one at the release bearing and the big one behind the tach. Is the perhaps missing spring relevant for release the pedal?

My buddy and I are considering of a additional strong spring behind the tach at the moment which would assist the one which is already there. But some people are saying with a diaphragm style clutch you have to remove the big spring behind the tach "only".

So what do you think of or what have you guys done after installing a diaphragm style clutch and coming through this?

Thanks,

Tim

Tim

Never drive faster than your guardian angel can fly Angel
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#2
I run a diaphragm clutch with no assist spring, the diaphragm usually has a softer pedal. Usually the only spring I use with a diaphragm clutch is to keep the throw out bearing from riding on the fingers. Diaphragm pressure plates can over center if there is too much travel.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
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#3
Hi Droptop73,

thank you for your Answer!

So you have only the spring directly at the release bearing arm to keep it back from the fingers after changing a gear?

With the assist spring you mean the big spring behind the tach in the dash? Did you remove it because the diaphragm style does not need it?

What do you mean with over center the pressure plate?

Sorry for my few questions but I am new on that clutch system...

Tim


Gesendet von meinem GT-I9100 mit Tapatalk

Tim

Never drive faster than your guardian angel can fly Angel
  Reply
#4
Tim-

The big assist spring under the dash was intended by Ford to help the driver in disengaging the clutch with the old-school Long style pressure plates. With the newer diaphragm pressure plate, there is now too much assist as you have found (assuming that I've read your post correctly).

The last one of these that I did I used a 5.0L HO diaphragm clutch setup and I removed the assist spring and all was fine...
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#5
I am using a retrofit clutch pedal on a conversion, I never had an assist spring.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
  Reply
#6
The assist spring can be removed with the diaphragm clutch-but please be careful it is a beefy part and it can take out an eye or give you one hell of a wallop if it is not respected

http://www.fordmuscleforums.com/transmis...pport.html

read down through the third post for removal trick that might be helpful

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#7
Great, guys, thank you! I really appreciate your help!!!

mjlan;172305 Wrote:Tim-

The big assist spring under the dash was intended by Ford to help the driver in disengaging the clutch with the old-school Long style pressure plates. With the newer diaphragm pressure plate, there is now too much assist as you have found (assuming that I've read your post correctly).

The last one of these that I did I used a 5.0L HO diaphragm clutch setup and I removed the assist spring and all was fine...

Hi Mjlan,

yes, you've read it correctly, that's exactly my issue. So I have understood the clutch system now and know what to do Wink

droptop73;172314 Wrote:I am using a retrofit clutch pedal on a conversion, I never had an assist spring.

Ok, thank you Wink

Jeff73Mach1;172363 Wrote:The assist spring can be removed with the diaphragm clutch-but please be careful it is a beefy part and it can take out an eye or give you one hell of a wallop if it is not respected

http://www.fordmuscleforums.com/transmis...pport.html

read down through the third post for removal trick that might be helpful

Thanks, Jeff! That's a very good tip and now it seems to be an easy thing Smile

You, guys, on the 7173MUSTANGS.com are the best!!!

Made my day banana

Tim

Tim

Never drive faster than your guardian angel can fly Angel
  Reply
#8
let us know if that works for you. I run a long style clutch and still need my assist spring at the moment.

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
  Reply
#9
I will do so of course Smile !

Tim

Tim

Never drive faster than your guardian angel can fly Angel
  Reply
#10
Usually the over-the-top assist spring stops working with a diaphragm clutch at high RPM, not at idle or with the engine off. Nevertheless, try removing the assist spring and see what happens. I agree you do need a small spring to keep the throw-out bearing off of the clutch disk/pressure plate fingers when the pedal is not engaged.

Let me check your shorts!
http://midlifeharness.com

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