I've noticed recently that my clutch is slipping, not under normal driving conditions though.
With all other cars I've owned, I check for clutch slippage by doing the following:
Drive car at around 40mph, in 4th, dip the clutch and rev the engine, to 5k or so then release the clutch pedal while applying more throttle.
If the revs drop almost right away, then clutch is fine, but if they slowly drop or even increase then clutch is slipping.
I tried this a few times today and noticed that the revs only dopped slightly, having to lift of the gass in order to allow the revs to drop to what would be normal for that speed.
I've also noticed that sometimes during a gear change, when "pressing on" the revs seem to hover a little, most noticable in the higher gears.
Now my question here is this, are there any further recomendations as to how to check for a slipping clutch and also as my car has the dual mass flywheel, are there are special checks that would have to be made prior to a diagnosis.
Another thing, would the flywheel normally have to be replaced at the same time
I know the best way is to simply have the car booked into the dealer, but I'm trying to get an idea of cost prior to doing this.
All help/comments appreciated...
__________________
95 E34 3.8 M5 6spd
87 Capri280 Turbo Technics, +290bhp@17psi [Not Currently For Sale]
83 Capri 2.8injection RIP
93 Mitsubishi Pajero
Last edited by plisken; 30th August 2004 at 15:53.
I usually chuck the mother in law and her sisters in the back and then carry out a hill start, gravity usually prevails in this test.
There are several ways to check your clutch, but suffice to say if you think its slipping then it probably is. Another test is to try to take off in 3rd or 4th gear and if all's well you should stall the engine. Although this is a bit rough on the car, I think the best way would be in 3rd or 4th at 4000rpm and floor it, which seems similar to your own test, chuck a hill in for good measure. I have replied to this thread as my car has had a couple of slips from time to time, most notably under full accn up a hill (from garrion bridge) changing from 2nd to 3rd, the clutch seemed to drag a little, one theory put my way was; if there is a flexi pipe in the clutch circuit, the pipe is collapsing as you lift the pedal, resitricting the flow back to reservoir, thus keeping the clutch 'open' longer causing slip. Personnaly I would keep driving untill it slips all the time under load and then get it checked out, it might just be a sticky release bearing. I have avoided the 'slip' in my car by slowing the gear changes down a tad, better for the box as well.
Phil.
Quote:
Originally Posted by plisken
I've noticed recently that my clutch is slipping, not under normal driving conditions though.
With all other cars I've owned, I check for clutch slippage by doing the following:
Drive car at around 40mph, in 4th, dip the clutch and rev the engine, to 5k or so then release the clutch pedal while applying more throttle.
If the revs drop almost right away, then clutch is fine, but if they slowly drop or even increase then clutch is slipping.
I tried this a few times today and noticed that the revs only dopped slightly, having to lift of the gass in order to allow the revs to drop to what would be normal for that speed.
I've also noticed that sometimes during a gear change, when "pressing on" the revs seem to hover a little, most noticable in the higher gears.
Now my question here is this, are there any further recomendations as to how to check for a slipping clutch and also as my car has the dual mass flywheel, are there are special checks that would have to be made prior to a diagnosis.
Another thing, would the flywheel normally have to be replaced at the same time
I know the best way is to simply have the car booked into the dealer, but I'm trying to get an idea of cost prior to doing this.
Quality road, many a good evenings driving has been had on that road, haeding to the PipinJay and then up to Lanark.
Not yet took the M up there strangely enough...
One of the reasons I had mentioned this was that I have really yet to notice it slipping while in gear, as opposed to causing slippage after releasing the clutch, hence I was thinking about the possability of some pressure related issue.
I've tried the steep hill, top gear test, but all did seem to be well, though the car didn't really accelerate(revs remained the same), perhaps not enough low down torque
I'm pretty sure, if I try to pull away going up a steep will, with plenty of revs, I'll slip before I wheel spin, but again this is slippage after releasing the clutch
I was meaning the hill upto overtown, but agree the larkhall - lanark run is a good one but a bit twisty for the M to be on full song!
Its interesting that you have noticed this since the new tyres and donuts!!
They must be grippy as hell !
By the sound of it the clutch is on its way, if your pedal is biting near the top of its stroke then the clutch is well worn, time to change. If the bite is near the floor then it may point to release bearing or hydralic problem. I have not had my car for long so my opinion could be way off. There's a guy selling genuine sachs clutches on ebay.com (lastime I looked) for around £160 but p&p from the states will be steep! I am compiling a list for a guy at euro car parts to have a look at and see what he can get! will advise.
cheers,
Phil.
By the way guys, from previous posts / experience, if the clutch is sliping get it changed straight away. You can do alot of damage to the release mechanism etc.
Best
M5 Powered
Quote:
Originally Posted by Phlem5
I was meaning the hill upto overtown, but agree the larkhall - lanark run is a good one but a bit twisty for the M to be on full song!
Its interesting that you have noticed this since the new tyres and donuts!!
They must be grippy as hell !
By the sound of it the clutch is on its way, if your pedal is biting near the top of its stroke then the clutch is well worn, time to change. If the bite is near the floor then it may point to release bearing or hydralic problem. I have not had my car for long so my opinion could be way off. There's a guy selling genuine sachs clutches on ebay.com (lastime I looked) for around £160 but p&p from the states will be steep! I am compiling a list for a guy at euro car parts to have a look at and see what he can get! will advise.
cheers,
Phil.
__________________
2004 CSL, Silver Grey with Factory De-limit & Alcon BBK
1995 M5 Limited Edition (02/50)Rosso Red SOLD
By the way guys, from previous posts / experience, if the clutch is sliping get it changed straight away. You can do alot of damage to the release mechanism etc.
Best
M5 Powered
That was one of my main concerns, but...
I have yet to get it slipping without any use of the clutch before hand, ie.
On the road to work this evening, I tried various speeds, in 6th and flooring the heavy pedal, but nothing, well nothing that I could notice.
However, as mentioned in posts above, I can induce slippage when pulling away or by means of the method detailed in initial post.
I'm now thinking that it may be something else.
O, the pain of M5 ownership
I'm geting my EDC suspension and steering checked over by a different dealer on Friday, so I'll have them check the clutch also.
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