1979 928 Clutch issues. Need advice
#16
It's a crap shoot, that is what makes it frustrating. That's why it's recommended to take apart and compare new to old just to be safe.
Changing the hose is cheap insurance, some have experienced the hose coming loose, draining the resivior.
I always put a clamp on both ends now, as seen in the thread I linked to above:
https://rennlist.com/forums/928-foru...he-fender.html
Changing just the hose in-situ is much easier in the 78-80 cars with the smaller brake booster.
Changing the hose is cheap insurance, some have experienced the hose coming loose, draining the resivior.
I always put a clamp on both ends now, as seen in the thread I linked to above:
https://rennlist.com/forums/928-foru...he-fender.html
Changing just the hose in-situ is much easier in the 78-80 cars with the smaller brake booster.
#17
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Who are you ordering the clutch kit from? I only ask because some sources understand the difference in years and which parts superseded what better than others.
That hole is to aid in replacing the master. Some feel cutting that hole is an acceptable short cut when doing the job. Since the hole is already there you will at least benefit from it.
That hole is to aid in replacing the master. Some feel cutting that hole is an acceptable short cut when doing the job. Since the hole is already there you will at least benefit from it.
#18
Who are you ordering the clutch kit from? I only ask because some sources understand the difference in years and which parts superseded what better than others.
That hole is to aid in replacing the master. Some feel cutting that hole is an acceptable short cut when doing the job. Since the hole is already there you will at least benefit from it.
That hole is to aid in replacing the master. Some feel cutting that hole is an acceptable short cut when doing the job. Since the hole is already there you will at least benefit from it.
This is the kit I have been looking at so far ^. Still shopping around, also looking at pelican and 928 international: http://shop.928intl.com/mobile/CLUTCH/products/114/13/0.
#19
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I have no experience with the 928 Motorsports clutch kit, but it's a modified unit and unless you plan on adding some serious power to your car, the stock clutch is all you need.
More importantly though, that kit is for 80-84 clutches and as it shows in those photos, will not work with the rest of your parts if original. As I noted above, the 78-79 cars are unique. Every part is a little bit different and you cannot mix & match all of them.
Also, one of the key components which may need to be replaced is not part of that kit - the indeterminate disc.
We may be putting the cart before the horse, I would drop the clutch, lay out all the parts and see what is in there. Someone may have already updated to the latest parts at some point.
More importantly though, that kit is for 80-84 clutches and as it shows in those photos, will not work with the rest of your parts if original. As I noted above, the 78-79 cars are unique. Every part is a little bit different and you cannot mix & match all of them.
Also, one of the key components which may need to be replaced is not part of that kit - the indeterminate disc.
We may be putting the cart before the horse, I would drop the clutch, lay out all the parts and see what is in there. Someone may have already updated to the latest parts at some point.
#20
I have no experience with the 928 Motorsports clutch kit, but it's a modified unit and unless you plan on adding some serious power to your car, the stock clutch is all you need.
More importantly though, that kit is for 80-84 clutches and as it shows in those photos, will not work with the rest of your parts if original. As I noted above, the 78-79 cars are unique. Every part is a little bit different and you cannot mix & match all of them.
Also, one of the key components which may need to be replaced is not part of that kit - the indeterminate disc.
We may be putting the cart before the horse, I would drop the clutch, lay out all the parts and see what is in there. Someone may have already updated to the latest parts at some point.
More importantly though, that kit is for 80-84 clutches and as it shows in those photos, will not work with the rest of your parts if original. As I noted above, the 78-79 cars are unique. Every part is a little bit different and you cannot mix & match all of them.
Also, one of the key components which may need to be replaced is not part of that kit - the indeterminate disc.
We may be putting the cart before the horse, I would drop the clutch, lay out all the parts and see what is in there. Someone may have already updated to the latest parts at some point.
http://www.autohausaz.com/search/pro...riction%20Disc
Hopefully will have the car on the lift by the weekend to pull the clutch and see what is actually needed. Just shopping my options and taking in a worst case scenario of what will need to be replaced.
#21
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Talk to Mark Anderson @ 928 International or Roger @ 928's R Us for original equipment parts like this.
Between the two of them is everything you need and all the knowledge of what fits what which can really come in handy with clutch projects.
There is a good possibility you will need some used parts to update your car to the latest parts. If memory serves, not everything is available new anymore.
Between the two of them is everything you need and all the knowledge of what fits what which can really come in handy with clutch projects.
There is a good possibility you will need some used parts to update your car to the latest parts. If memory serves, not everything is available new anymore.
#22
Talk to Mark Anderson @ 928 International or Roger @ 928's R Us for original equipment parts like this.
Between the two of them is everything you need and all the knowledge of what fits what which can really come in handy with clutch projects.
There is a good possibility you will need some used parts to update your car to the latest parts. If memory serves, not everything is available new anymore.
Between the two of them is everything you need and all the knowledge of what fits what which can really come in handy with clutch projects.
There is a good possibility you will need some used parts to update your car to the latest parts. If memory serves, not everything is available new anymore.
#23
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All the parts for the double clutch are available and in stock.
However the intermediate plate is expensive.
However the intermediate plate is expensive.
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
#24
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I've always wondered what difference the leverage was with the larger ball and updated fork compared to the original.
That's why I stalled working on my 78 since I needed a fork, larger ball which also requires upgrading the bellhousing.
#25
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ShawTurnage and Hacker: we do not offer clutches for the 1978/79 models.
Little piece of 928 history: after the brand new Porsche 928 was let out to car magazine editors and later, to the first 928 buyers; the first feedback started to come in. Great car, but the brakes were undersized and the clutch was too weak. Porsche "fixed" both of these early model issues by 1980 and 1981.
I wouldn't put any money into a 78/79 concentric clutch.
By 1980, Porsche had scraped the concentric clutch in favor of a pinned clutch that the used for 1980 to 1986 without problems. It shifts better, and is less likely to slip than the concentric clutch was.
To upgrade your 78/79 to a 1980-1986 pinned clutch you will need a used flywheel, a shifter release fork, a throw-out bearing (which you likely need anyway) and of course, all the regular clutch bits like the pressure plate and friction disks that you would be replacing anyway. The intermediate plate needs to be swapped too.
At the price and scarcity of concentric clutch parts anymore, updating the clutch to the improved design makes more sense now than ever before.
Little piece of 928 history: after the brand new Porsche 928 was let out to car magazine editors and later, to the first 928 buyers; the first feedback started to come in. Great car, but the brakes were undersized and the clutch was too weak. Porsche "fixed" both of these early model issues by 1980 and 1981.
I wouldn't put any money into a 78/79 concentric clutch.
By 1980, Porsche had scraped the concentric clutch in favor of a pinned clutch that the used for 1980 to 1986 without problems. It shifts better, and is less likely to slip than the concentric clutch was.
To upgrade your 78/79 to a 1980-1986 pinned clutch you will need a used flywheel, a shifter release fork, a throw-out bearing (which you likely need anyway) and of course, all the regular clutch bits like the pressure plate and friction disks that you would be replacing anyway. The intermediate plate needs to be swapped too.
At the price and scarcity of concentric clutch parts anymore, updating the clutch to the improved design makes more sense now than ever before.
#27
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To upgrade your 78/79 to a 1980-1986 pinned clutch you will need a used flywheel, a shifter release fork, a throw-out bearing (which you likely need anyway) and of course, all the regular clutch bits like the pressure plate and friction disks that you would be replacing anyway. The intermediate plate needs to be swapped too.
As I posted above from the WSM, the upper bell-housing needs to be replaced too.
So basically, to convert a 78/79 to the later style double disc clutch, you replace everything from the crank to the torque tube, except the clutch shaft, lower bell-housing, and slave.
Further reinforcing my idea to convert my 79 track car to single disc.
#28
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So we got from "clutch not opening" to "replace it all."
I suggest getting a good bleed on the clutch hydraulics and cranking back the adjusters before committing to a replacement. The bottom cover will come off for the adjustment so you'll be able to check for problems.
#29
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I'm not reading that. Is the hole too small for a later arm? Could that be hogged out?
So we got from "clutch not opening" to "replace it all."
I suggest getting a good bleed on the clutch hydraulics and cranking back the adjusters before committing to a replacement. The bottom cover will come off for the adjustment so you'll be able to check for problems.
So we got from "clutch not opening" to "replace it all."
I suggest getting a good bleed on the clutch hydraulics and cranking back the adjusters before committing to a replacement. The bottom cover will come off for the adjustment so you'll be able to check for problems.
#30
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Maybe?
I don't remember why, but when I sat down with Jean-Louis and a pile of parts, I ended up leaving with a later style bell-housing. Maybe because removing it is necessary either way, it's a very inexpensive part - just put the newer one on was my decision. If a replacement bell-housing was $1,000 that would have swayed things.
Kind of a moot point when discussing a part most throw away when parting out a car. Just good to know the change is there.
Just a dialog discussing what-if's.
For a complete newbie like the OP, it's good to know that at some point down the road that clutch is 100% NLA (assuming it's still original) and good for anyone searching on the subject.
I don't see the harm in working through this problem in an open discussion.
I don't remember why, but when I sat down with Jean-Louis and a pile of parts, I ended up leaving with a later style bell-housing. Maybe because removing it is necessary either way, it's a very inexpensive part - just put the newer one on was my decision. If a replacement bell-housing was $1,000 that would have swayed things.
Kind of a moot point when discussing a part most throw away when parting out a car. Just good to know the change is there.
Just a dialog discussing what-if's.
For a complete newbie like the OP, it's good to know that at some point down the road that clutch is 100% NLA (assuming it's still original) and good for anyone searching on the subject.
I don't see the harm in working through this problem in an open discussion.