What to look for? Clutch related grinding/rattle???

LatinPorsche911 · 11-04-2019, 11:20 PM

I am not sure what words to use in the search engine to find help in regards to a current problem in my 89, 911.

Engine works fine, starts up and seems to have normal power. I drove it for a few minutes thinking that maybe the noise would go away, but it continued, so went back home and parked it.
The issue is that every time I press on the clutch, there is a rattle, metal rubbing (grinding??) noise that comes from somewhere in the back seats below.
Again, the noise only seems to happen when the clutch is pressed downward. From the start all the way down, then once it engages into any of the gears (and reverse), the clutch is released and the sound seems to disappear. I am somewhat sure that it does, although the sound of the engine might muffle the sound if there is any. But I believe the sound disappears for the most part. It goes into gear effortlessly, there is no problem there. Just that crazy noise

Is there a specific terminology or phrase for me to search and learn what is going on?
Or would someone have an idea what is happening?
Thanks big time
R

proporsche · proporsche's Garage

hi..it is very possible that your clutch disc is broken.Your model came with clutch disc made of rubber center.Later models have spring loaded centers look here.I assume your 911 has around 50-70k miles?

rubber type

spring type

here is a link to our host with it
https://www.pelicanparts.com/cgi-bin/ksearch/PEL_search_2016.cgi?command=DWsearch&description=porsche+911+rubber+clutch+disc

You can use the spring type but i do not like it so much because with the spring disc a lot of transmission noise is carried into the cockpit trough the shift tunnel.
But a lot of volks use it .....

Ivan

the best would be if you can record the noise, to be sure.....

wayner · 11-05-2019, 12:27 AM

Clutch release bearing or throw out bearing shot?

Also check for a cracked release fork or whatever it’s called

Lyle O · Lyle O's Garage

Check to be sure that you are not over-actuating the clutch pedal (and therefore the clutch). There is a stop on the floor board; adjust it so that the peddle depresses less, and give it a try, especially before you look at more serious issues internal to the clutch itself.

proporsche · proporsche's Garage

Lyle ,his clutch is hydraulic;-)

Ivan

Lyle O · Lyle O's Garage

Yes, I know (I have an '87 / G-50 also). But the forward actuation of the pedal still has a stop, and if it over actuates it allows the hydraulic actuator to over-extend the fork into the pressure plate. I had this issue a while back and this was the easy fix.

proporsche · proporsche's Garage

good point, but in the OP case i have a feeling it is not that;-)
Ivan

Lyle O · Lyle O's Garage

Could be, but, like it says in another thread, check the easy stuff first

!

jlex · jlex's Garage

Yeah, like the fluid level in the brake fluid reservoir.... it supplies your hydraulic clutch as well. Hope it isn't a bad pilot bearing...

LatinPorsche911 · 11-05-2019, 06:43 PM

Thank you guys for the input.
Wow! Well I guess I'll start with the easy issues and go in further.
I was wondering if somehow I did not put something back or ???
Last time I was down there I replaced the starter, so had to lower the engine and do what needed to be done in relation with transmission. At first the noise wasn't that loud when I did the test drive. Then haven't driven it until Monday. And got me worried.
Thanks again, I'll start on it tomorrow
R

proporsche · proporsche's Garage

latin..how many miles on your clutch?Also was it done before if over 150k?
You should consider if you not, have the update done on your clutch release fork shaft ..

Ivan

CCM911 · 11-06-2019, 08:43 AM

I have also seen this on G50 cars.

Quote:

Originally Posted by Lyle O

Yes, I know (I have an '87 / G-50 also). But the forward actuation of the pedal still has a stop, and if it over actuates it allows the hydraulic actuator to over-extend the fork into the pressure plate. I had this issue a while back and this was the easy fix.

LatinPorsche911 · 11-07-2019, 11:22 AM

The car has like 83xxx miles, and I think I'm the 2nd or 3rd owner. But I am not aware of any transmission work done.
Is that what it's called? clutch release fork shaft
What must I do to verify if it's that or just go ahead and replace it?
Thanks again

proporsche · proporsche's Garage

latin... here some reading besides the clutch replacement...83 k that is the max you can get out of the clutch live..so prepare for clutch job and an update..
Update G50 Clutch Fork