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924 Clutch replacement experience

russmw

PCGB Member
Member
Morning,

After getting more annoyed with the clutch rattling at biting point I've started to replace the clutch and thought I'd document the fun and games here for other users. I'd say I'm quite good when it comes to home mechanics but I'm simply working on the garage floor (carpet
ugs are down so a little bit of comfort). Decided to do an hour each evening to break up the task which also means if something goes a bit wrong I can just walk away for 24 hours! I have a new gearbox to go in which I've replaced seals and given a basic service in preparation.

Ill add any exciting pictures as I go along and remember safety first :)

Post completion note: If your thinking of doing this job yourself it's 100% do-able with lots of research and bit of logical thinking. Took me about 14 hours so either right off a weekend or do an hour a night over a few weeks. Read through the below which might help as there are some gotchas to look out for and feel free to PM me if you have any questions. Good Luck!!

1st night
- Removed the exhaust from the down pipe back. This came off ok as I'd replaced it 2 years ago
- Remove both drive shafts. I'd rebuilt these a few years ago so the bolts came out ok but its far easier to do with the car on the ground and just roll car forward as you work through the bolts. Totally removed them to get them out the way.
- Release gear linkage. The rubber boot that covers the bolt was rock hard after 36 years of sitting next to the exhaust so I cut it off then cut the lock wire and released the linkage.
- Disconnect the gearbox orque tube. Going through the access holes in the gearbox housing I rotated the engine until I could access the bolts which need fully removing then slide the coupler back into the gearbox.
- Remove the exhaust bracket from the back of the gear box and the rear box heat shield.

2nd night
- Inside the car and disconnect the gear linkage rod from the gear stick, remove the 2 bolts for the gear stick and lift it out then 'convince' the linkage rod to go forward through the foam surround. I tried a few different angles before it moved forward enough.
- Push forward the plastic tube that the gear linkage goes through on top of the gearbox. This needs moving towards the front of the car and is simply 'in there' but was a pain to slide back. Ended up with a bit of wood over the gearbox and hitting that to push the tube back.
- Disconnect reverse sensor cable.
- Lodge a piece of wood or similar between the torque tube and rear beam in preparation to support it as the box comes out.
- Remove the bolts that hold the gearbox to the toque tube (one 17 mm and three 19 mm bolts - only one that's difficult is the 19 mm next to the accumulator which is bit of fiddle)
- Time to drop the box which is seriously heavy! With the car on the ground and all weight on the wheels I put a trolley jack under the cv cups on each side of the box then slowly removed the gearbox mount bolts. As the bolts came out the weight of the box was taken on the trolley jacks which allowed me to slowly lower the box down while lifting the back of it up and down as required to clear the spare wheel well.
- As the box cleared the torque tube, spare wheel well and fuel tank I let it sit on the floor then jacked the car back up and dragged it out via the exhaust cut out.
- Release the 2 exhaust clamps on the torque tube in preparation for it to be slid back from the bell housing.

Thoughts so far: My main concern about the job overall was dropping the box but actually it wasn't too bad. I'm lucky that I've taken quite a bit apart in the past so no stuck bolts yet but I'm only 25% through the complete job so fingers crossed!!! Plan to remove front heat shields etc and slide the toque tube back tonight then clutch bell housing off Friday night.
 
I funked out of doing my clutch change 'cos I found someone who'd do it for not much money and also because I've done nasty jobs like fuel lines in the past.
As you say the gearbox is heavy and it can quickly get away from you if you're on your own. Is yours a 4 or 5 speed?
The mechanic did the same as you rather than slide gearbox/torque tube back and try and work through a 4" slot which is supposed to be 'easier'.
It'll be interesting the condition of the release fork and bearing.
Any photos on the horizon?
Keep up the good work [;)]
 
First bolt not playing ball tonight and on the dumbest of things, the rear exhaust clamp on the torque tube loosened half a turn then jammed solid. After trying to get it off for 20 minutes I just beat the cr@p out of it so it'll clear the rear axle which leads me too...

3rd night:
Removed the last front heat shield then the 4 bolts that hold the torque tube to the bellhousing. Tried pulling the toque tube back but it wouldn't budge which worried me as read about them sticking in the pilot bearing. Few bangs with a hammer and large screw driver it broke free!! Slid back just enough to clear the bell housing so I also released all but one bell housing bolts ready for tomorrow. Also swapped the linkage over from old box to new one.

Vince, it's a 5 speed so box had to come off as there's only an inch max. Between the box and spare wheel well. I did a head rebuild on it 2 years ago and enjoy the work (so in theory costs less than a garages hour rate) plus I have no time limits on how long it takes as the 924 is a ''toy" and isn't needed daily. In all honesty I now think pulling the engine would be easier if I ever did the clutch again.

Promise photos tomorrow!!
 
Thanks Waylander - didn't know they existed.

I don't need much forcing to buy new tools :)
 
russmw said:
Vince, it's a 5 speed so box had to come off as there's only an inch max. Between the box and spare wheel well. I did a head rebuild on it 2 years ago and enjoy the work (so in theory costs less than a garages hour rate) plus I have no time limits on how long it takes as the 924 is a ''toy" and isn't needed daily. In all honesty I now think pulling the engine would be easier if I ever did the clutch again.

Your previous point about some things being easier to take off because you'd worked on them before is a good one. "If it ain't broke don't fix it" doesn't really work with old cars because when you do have to fix it, it's either 'really hard work' or it breaks. Makes you wonder how many of the expensive concours cars would be a nightmare to work on 'cos they've hardly been touched mechanically.

Mine is, in theory, a toy, but I try not to have it off the road for too long because I've seen so many people who've taken a car off to do work and never get round to finishing it.

Yes, I considered pulling the engine as a more manageable option for someone without a ramp.

Are you replacing nuts and bolts as you go?
 
Everything is getting cleanedpainted or replaced before it goes back on - I don't want to get covered in dirt & oil etc twice so its all going back on clean and shiny. I try to do this every time I work on the car as it makes things easier in the future.

vincematthews said:
Mine is, in theory, a toy, but I try not to have it off the road for too long because I've seen so many people who've taken a car off to do work and never get round to finishing it.


I've also found the car doesn't like sitting round for months on end and something seems to break when its tucked away so I try and use the car most weekends. Fingers crossed it'll be back on the road for next weekend!

 
Its off!!!!!

Finished work a bit early this afternoon to get the clutch removed. Final bolt that caused problems was a 19mm bolt on the top of the bellhousing which screwed through the block and had a bolt on the other side which I could only get to by removing the passenger side engine mount, this took an hour on its own. After this was out the remaining bolts came out ok and with a bit wiggling the bellhousing came off closely followed by the clutch. The springs on the clutch plate are screwed and I can easily rotate it by hand. Time now to clean everything up and get ready to put it back together!

As promised a random collection of photos showing mucky parts of the car now in bits. Mostly self explanatory.

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[/url]IMG_20180831_192350 by Russell Wileman[/IMG]
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russmw said:
Its off!!!!!
Finished work a bit early this afternoon to get the clutch removed. Final bolt that caused problems was a 19mm bolt on the top of the bellhousing which screwed through the block and had a bolt on the other side which I could only get to by removing the passenger side engine mount, this took an hour on its own. After this was out the remaining bolts came out ok and with a bit wiggling the bellhousing came off closely followed by the clutch. The springs on the clutch plate are screwed and I can easily rotate it by hand. Time now to clean everything up and get ready to put it back together!


That top 19mm positioning is poor design imho, it would have been so easy to offset it to be easier to maintain.

Have you checked the date code on the clutch - mine was still the factory fitted after 38 years.

I wish my gearbox looked like that - nice one!


 
While its all apart and I'm waiting for the new clutch kit & parts to arrive I cracked out the toothbrush and started to clean the underneath whilst getting reminders from my wife of 'why are you doing that? nobody will ever look under there!' which clearly isnt the point. I need to get back under there to finish off cleaning it up but this is also a reason I wanted to do the job myself as clearly a garage isnt going to bother or its going to ramp up the bill.

I found what I think is the manufacturing date for the clutch, July 1981 and looking at the wear on it I suspect backs up the mileage (currently 78k) which is nice.
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New clutch kit arrived yesterday (£180 for Sachs 3 price kit and alignment tool delivered from frazerpart) so cracked on in my one hour time slot and started fitting it last night.

Clutch, flywheel and bellhousing with shiny new release bearing and guide tube in place with relative ease so decided to slide the torque tube back in place. Discovered at this point the engine is 10mm to high so suspect the engine mounts have lifted slightly and engine tilted a degree or two. Hour up at that point so think about it all day and back on it tonight.

All looking ok though ??

 
Russ, you impress me with your 1 hr time slot progress never mind working on the floor.
It takes me that hr just getting my mind focussed before I start??

Loving this post??
 
Had 5 minutes spare at lunch so put this together which more or less explains the current state of play with the clutch in a classic way:

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Overshot the 1 hour time slot tonight as it didn't quite go to plan!

Torque tube wouldn't line up correctly as the back of the engine was to high. Trolley jack on the front quickly lifted the front/lowered the rear enough but the torque tube would just slide in. Ended up getting it 99% of the way in then I tightened the bolts up and all good. Checked the engine turned over by hand and nothing jammed up.

Attached the clutch cable (mechanical/cable clutch) and pushed the clutch in which felt very, very light! Got underneath and the release bearing was pushing against the clutch cover but not enough? Adjusted the cable, still not enough, more adjustment and....... This isn't good.

Removed the clutch cable and torque tube to check everything was ok then remembered reading about adjusting the clutch arm. Released the arm and tweaked it by 3 splines, reattached the clutch cable, held the clutch pedal in which was far firmer and hey presto the clutch plate turns independently!!

Slid the torque tube back on and this time it just slipped straight on, bolts tightened up and it's all good. Quick check of the clutch cable and I need to adjust it to the required spec but back on schedule.
 
russmw said:
Removed the clutch cable and torque tube to check everything was ok then remembered reading about adjusting the clutch arm. Released the arm and tweaked it by 3 splines, reattached the clutch cable, held the clutch pedal in which was far firmer and hey presto the clutch plate turns independently!!

Slid the torque tube back on and this time it just slipped straight on, bolts tightened up and it's all good. Quick check of the clutch cable and I need to adjust it to the required spec but back on schedule.


Yes, over the years, the cable stretches, the clutch wears and the cable gets adjusted and you need to get it all back to the original state. Mine was given a new cable as it's done more miles than yours and I decided to put on new ends as these were showing signs of wear. These are no longer available so I had them made.

I also found that the clutch change improved the gear change.

 
We have a gearbox on, the torque tube all connected back up and the gear linkage back in place. ??

Friday night was bit of a disastrous evening as I went to fit the new rebuilt gearbox and after getting it in place, the mounts tightened up and the lower bolts attached to the torque tube I could not get the top to line up correctly where it has 2 dowels that's sit between the gearbox and the torque tube. Hour and a half later I realise the dowels from my car are in the torque tube and the dowels from the donor gearbox are in that - two dowels do not go into one ?? the box was dropped back out in record time and the extra dowels knocked out.

This afternoon I had the gearbox back in place and bolted up but when connecting the gear linkage I realised I'd put part of it in upside down. If I'd simply reused the old box it would have saved about 2 hours but I'm happy the new box is in.

Only thing left to do is fit the driveshafts and exhaust, go round and re-torque everything then see what happens.

One lesson Ive learnt.

"If a part does not simply slide back into place when putting it back together, something is wrong."

I've had a few bits that needed convincing until I realised a part was in the right place etc.

I'll take some more photos and do a brief review should anyone opt to change their clutch in the future.


 
Plus 1

Was really tempted to do the clutch on my wife's 924S-I have 3 trolley jacks & numerous
axle stands but the free end of our garage isn't really wide enough & didn't fancy doing it on the drive?
John at Unit 11 in Warrington actually did it for just over twice the Sachs clutch kit price in the day - just the VAT which ruins it??
 

Vitesse - Did you mean to post that at 9.24 [8D]

I'm officially back on the road after a few hours to finish the job up this afternoon. The clutch is nice a light with the biting point roughly half way up, the car will go into 1st and reverse with no crunching and there's no rattle at biting point - basically, result!!

There a few bits left to do as I broke a jubilee clamp on one of AAV pipe and the exhaust is rattling small amount when going over speed bumps but both easy fixes.

It was 5 years ago today I picked up a dull white 924 which didn't start properly, wouldn't idle and had gauges which fluctuated wildly along with a host of other problems. Five years on to the day I have a 924 which I would jump in and drive the Scotland if needed, cracking car which just makes me smile!!

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