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post #1 of 15 (permalink) Old 08-29-2017, 11:38 AM Thread Starter
eas
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Clutch problems

Following the problems I have encountered, I am still baffled what the issues are.

The issue can be found on this thread
http://www.alfabb.com/bb/forums/gear...t-working.html


Since, I have replaced the clutch slave cylinder and rubber hose, bleed the system thoroughly , but the problem still persists. I drove the car for about 15min by switching it On on first gear, and used lots of engine break, and back on the throttle back and forth trying to free up the clutch (with clutch pedal always pressed in) but it does not want to free it self.

The pedal is sitting slightly above the brake pedal so i doubt the issue is the pivot pin. When pressing the clutch I do feel pressure, which indicates the trust bearing is pushing on the pressure plate.

I am baffled to what the issue might be.

Please help. What do you suggest i should do next ?

1971 - 2000 GT Veloce Euro
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post #2 of 15 (permalink) Old 08-29-2017, 11:46 AM
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Master clutch and slave inspected for machining material that may have breached the seals ...happened to me once and since that time I take them apart and check reassemble with correct grease.... just a thought..
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post #3 of 15 (permalink) Old 08-29-2017, 12:00 PM Thread Starter
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Quote:
Originally Posted by Tom Frasca View Post
Master clutch and slave inspected for machining material that may have breached the seals ...happened to me once and since that time I take them apart and check reassemble with correct grease.... just a thought..
Like I said, Slave is new including hose pipe, changed the old fluid by emptying the system and replaced with new fluid and it is pushing the clutch fork correctly. Do you suggest the master might be the issue even though the clutch fork is being pushed correctly ?

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post #4 of 15 (permalink) Old 08-29-2017, 12:19 PM
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clutch problem

I had a jensen healey that did that. Turned out engine oil had leaked onto the clutch plate and was causing it to not only swell up but also to stick to the flywheel and pressure plate. (JH's notoriously leak oil from the back of the valve cover down the back of the engine). Fixed the leak, replaced the clutch, surfaced the flywheel and pressure plate and has been good to go ever since.
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post #5 of 15 (permalink) Old 08-29-2017, 12:23 PM
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No not really I was suggesting that anytime a hydraulic unit is replaced to disassemble and make sure there are no machine filings left in bores ...it happened to me once...good luck
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post #6 of 15 (permalink) Old 08-29-2017, 12:32 PM Thread Starter
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Thanks for the tip Tom Frasca

VenturaAlfa, good point you mentioned, the engine does have a small oil leaks, however, the car was working flawlessly 2 weeks prior to the clutch getting stuck, and i might be wrong here, but shouldn't the clutch slip if oil drips on to it ?

1971 - 2000 GT Veloce Euro
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post #7 of 15 (permalink) Old 08-30-2017, 04:07 AM Thread Starter
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Is there a sort off access panel on the bellhousing where I can peep in and see what is going on ?

1971 - 2000 GT Veloce Euro
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post #8 of 15 (permalink) Old 08-30-2017, 08:24 AM
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The video you posted in the other thread sure looks like it is leaking fluid. If fluid can leak out then air can leak in.

If you are getting full motion of the slave at the clutch operating fork then it must be something internal - at the clutch itself - either a faulty throw out bearing (which wouldn't tend to come & go) or a stuck clutch disc (could be rusting to the flywheel &/or not sliding on the transmission input shaft). Could the input shaft be seizing in the pilot bushing?

- - Eric
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post #9 of 15 (permalink) Old 08-30-2017, 08:41 AM Thread Starter
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Hi Eric,

Thank you for your feedback. Since the video, I have replaced the slave including hose with a new one. I am 99% sure I am getting the full motion, which as you suggested, is the clutch itself. Strange thing is that I am feeling clutch pressure on the pedal like normal operation which I am assuming the pressure is coming the Pressure plate.

Therefore it "must" be the disc got stuck to the flywheel, which is kinda odd in just 2 weeks. I gave it some heavy driving with clutch pedal pressed, which should have released any rust accumulated in 2 weeks.

Is it possible to have the input shaft seize in the pilot bushing?

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post #10 of 15 (permalink) Old 08-30-2017, 09:01 AM
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Quote:
Originally Posted by eas View Post
Is it possible to have the input shaft seize in the pilot bushing?
I don't know! I was just throwing out guesses.

I had a Chevy pick up where the clutch disc would hang up on the splines of the transmission's input shaft. Wear & burrs on the splines. It made for intermittently difficult shifting.

- - Eric
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post #11 of 15 (permalink) Old 08-30-2017, 09:04 AM
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I was with Richard Jemison when the clutch stuck on his Spider race car. The friction material had separated from the disc.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #12 of 15 (permalink) Old 08-30-2017, 09:33 AM Thread Starter
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Thank you all for your help.

It seems that there is only one way to find out. Gearbox out and see what I find.

1971 - 2000 GT Veloce Euro
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post #13 of 15 (permalink) Old 08-30-2017, 10:22 AM
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I bought a very cheap endoscope that connects to a USB port on my lap top (eBay). It actually works quite well. With something like that you might get a good look at what is happening (or not happening) inside the bell housing. But it does sound like the transmission will need to come out for a final diagnosis and repair.

- - Eric
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- -~ 1981 GTV-6 ~
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post #14 of 15 (permalink) Old 08-31-2017, 03:34 AM
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Quote:
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Like I said, Slave is new including hose pipe, changed the old fluid by emptying the system and replaced with new fluid and it is pushing the clutch fork correctly......
well I dunno.....
might just be me misinterpreting the video (linked again below), BUT the fork travel looks way more than the 11-12mm specs it should travel....from here it looks like a good inch!

could that be a clue??

http://www.alfabb.com/bb/forums/7782018-post10.html

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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post #15 of 15 (permalink) Old 09-01-2017, 12:45 PM Thread Starter
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Hi all,

I gave it another go today and did a long journey and I managed to shift to third (rev matching) and gave it some hard acceleration up hill and engine brake down hill all the time with clutch pressed to the metal, but the clutch remained stuck. ;(

1971 - 2000 GT Veloce Euro
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