Non Omega 915 Pedal cluster clutch spring question

[ARCSinAK]

I have a 74 Targa with a 7/31 915 gear box that is wonderful except the force required to depress the clutch pedal. Much greater force is required than my 901 or the 915 in my 80c. I purchased a new clutch cable thinking that it may be the culprit but prior to installing yesterday I was examining the pedal assembly and seems that the condition may have something to do with the strength of the spring on the clutch pedal. It nearly flexes the floor pan when depressing the clutch. I am aware that Porsche added a helper Omega spring in 77 I believe to assist but I believe there is something else going on in my 74 as it is twice as difficult as the 901 non Omega gear box. Wondering if I can change this strength of the pedal assembly spring or if I have a problem with the clutch arm inside the box. Your thoughts and ideas would be much appreciated.

[lrodri64]

Could be the pressure plate

[john walker's workshop]

Thin disc=hard pedal. Dragging clutch cable doesn't help either.

[ARCSinAK]

Hum
Guess I can change the cable 1st see if it changes the feel.
Also thought I could disconnect the cable from the gearbox side and feel the action of the cable and spring.
I remember when I awoke her from a 5 year sleep the clutch seemed to be frozen to the flywheel, had to bump the starter to free/separate. I attributed it to corrosion, could this also be related to a “thin disc “?

Maybe it’s time for a new clutch.

[john walker's workshop]

Just related to humidity and rust.

[3rd_gear_Ted]

Pressure plate springs aren't doing the job, your foot is doing the extra work required.
BUT, is the Bowden tube portion of the clutch cable routed correctly by the tranny from the body to the cable end holder??? This is critical for early arm set up. Watch the action of the cable tube, if it bows around a during use its worn too.

[ARCSinAK]

Thanks for the tips
Going to have a chance to Bowden tube today..
I figure installing the new cable may help some until I can drop the motor and trans.

[manbridge 74]

Make sure your helper spring is attached (upper left in pic)

There is a lot going on between foot and release springs on pressure plate. Pedal bushings, ball socket, cable condition and routing. The vertical bushings in the bellhousing can seize up after sitting. They can become out of round after 45 years...

[ARCSinAK]

Blue spring correct orientation
Cleaned grease off looks as though bushings in the cluster were replaced. No play at clutch pedal.


Thinking about changing cable as I have one and could check that off as a issue.
Maybe I’ll get lucky. I need to education on how the pressure plate functions.

[ARCSinAK]

Self taught auto body, was tired of looking at the X’s perfect storm. Had to save another one.

I’ll hopefully get my safety check today with out the rear glass. I have the rear glass but want to paint prior install.

Thinking a shade of dark green.

Moss
British racing
Irish
Emerald
??

[Tony V]

I had this issue with my ‘74. Changed the clutch cable but no improvement. Removed the pedal assembly to find the original plastic bushing gone and the tube, the pedals are attached to, rubbing on the base of the cluster. Replaced the bushings with the bronze ones and it’s almost like having a hydraulic clutch! ( not quite but so much better)

[ARCSinAK]

I inspected the bushing and they appear to be fresh, no play in the pedal, maybe it need to pull the cluster and take a better look.

[Dodge Man]

Years ago I had a SC 3.0 and the original 1973 915 w/o Omega and there was not a stiffness problem.

The bushings, cables, springs, and tubes are over 35 YO. Less expensive, easier fixes are the place to start IMHO.

I now run an 86 915/SC 3.0 with Omega Spring. My pedal cluster looked good but the clutch roll pin was cracked and clutch feel was inconsistent even after a new cable. New bushings and now EZ Money clutch feel. Best of luck.