HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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» Clutch Issues - HELP!!!
Wed May 16, 2018 10:51 am by Fubar

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Clutch Issues - HELP!!!

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Clutch Issues - HELP!!!

Post  jHo on Tue May 01, 2018 1:50 pm

So my car's been running for a little over a year now, and it seems that the nagging problem is with the clutch. I've already replaced the the throwout bearing once, and a few months later it feels like the clutch is slow to release from the floor again. At startup after sitting for a week or so, it legitimately stayed on the floor until I kicked the pedal to release it, then as I drove it, it did not stick, but felt like it released slowly off the floor. So I bled it, and it felt a bit better, but still doesn't seem right. Seems like there is a hesitation off the floor, so I don't think that "fixed" the problem.

My car is an 86 n/a with turbo trans, LS3 crate, Ford Hydroboost, stock 944 clutch master (not the original, but a stock one that was replaced years before the swap), GM flywheel, pressure plate, throwout bearing, and TPC clutch.

Any ideas what is wrong?
I went the LS3 crate for reliability reasons, so I really want to get the problems sorted, even if it means new parts and more $$$.

Thanks in advance.

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Re: Clutch Issues - HELP!!!

Post  sharkey on Tue May 01, 2018 5:44 pm

did you remove the clutch assist spring from the clutch pedal when you did the swap? if not i would recommend doing that and see how it feels.

sharkey

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Re: Clutch Issues - HELP!!!

Post  docwyte on Wed May 02, 2018 8:12 am

I put my clutch spring back in. I hated the way it felt without it. I feel there are no benefits for removing the spring, if you're having a clutch issue, its not due to the spring.

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Re: Clutch Issues - HELP!!!

Post  jHo on Wed May 02, 2018 10:26 am

Differing opinions! I love the internet!

Seriously though, I appreciate both opinions, and I don't remember removing that assist spring, so I believe mine is still there. Plus, the clutch feels fine when it's moving, it's just the hesitation (or worst case sticking) as it comes off the floor. So I might be leaning toward's docwyte's opinion there.

Any thoughts on the clutch master? Are guys using Porsche 944 ones, or going with different ones that are a different size? Pro's and Con's?

Thanks!
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Re: Clutch Issues - HELP!!!

Post  sharkey on Wed May 02, 2018 12:50 pm

there is some debate on master cylinder size. some run stock, others go with a larger 13/16" or 7/8" bore. size is generally increased if the clutch is releasing/grabbing real close to the floor.

the clutch assist spring is designed to make the stock clutch smoother and more linear pressure feel. in the first bit of the travel you are actually pushing against the spring, making the pedal firmer, and once you get down part way the spring overcenters and it helps push the clutch pedal down, making the bottom part of the travel softer. the spring is set up for the stock pressure plate, and any changes in the clutch system can cause issues with it.

when i did my swap my clutch pedal would go down real easy, and would come up slow, i had to almost take my foot right off the pedal to get it to come up, and it would get a ways up and then pop up the rest of the way. i removed the spring and never looked back.

i would try it without the spring, or at least adjust it as weak as possible.

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Re: Clutch Issues - HELP!!!

Post  948 on Fri May 04, 2018 8:11 am

I still have the spring installed, 12 years with no issues....
The topic of sinking/non-returning clutch pedal has been a popular one over the years. If your pedal is going to the floor and staying there, and the clutch is still engaged, then there is some failure in the hydraulic/mechanical circuit.....obviously.
If the hydraulic circuit is all liquid, no air, then it is considered incompressible....motion at the pedal should directly translate to movement at the clutch pressure plate and vice versa.
This could be a failed MC, air in the system, SC, or excessive gap between SC and clutch fingers. Since your system worked before, and sort of works after manual actuation, I would say that it is one of the first 2.
Cheap/failed MCs can leak fluid internally causing this type of problem, getting better once you cycle some additional brake fluid back in.
Air - this I think is the most common issue and most difficult to eliminate. The air can be there from the beginning in a small amount then once heat cycling begins - expansion of air and brake fluid - the brake fluid can be forced back in to the reservoir up top, then once cooled create a sort of negative pressure that allows the pedal to come down. Also, I have read about boiling of the fluid, creating a similar situation with the pedal going to the floor.
If it were me - I would replace the MC with the OEM ATE brand, inspect the SC checking for leaks and correct shim gap, and then fully bleed the system.....fully. Tick performance's speed bleeder works very well, just submerge the one end in the brake fluid reservoir and bleed away. There is a check valve allowing you to just cycle the pedal up and down. Also, you leave the speed bleader attached to the SC, keeping the end up high, and you can then burp air out in the future
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Re: Clutch Issues - HELP!!!

Post  Fubar on Wed May 16, 2018 10:51 am

I bought a Tilton 7/8" bore MC from our site sponsor (TPC). I wanted to have all the parts for a no-brainer swap out. I'm installing it today. I'll let you know how it works.

FWIW-everyone seems to complain about problems getting all the air out of the system. I'm going to try to install the MC with brake fluid already filled before I connect the hoses. It might be a little messy but worth the problems you may avoid. Once I install the MC I will replace the fluid in the entire system in the traditional way (pump the pedals). If I need a power bleeder I can get one from Advance Auto on their tool loaner program.

Wish me luck!
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Re: Clutch Issues - HELP!!!

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