clonking noise on backlash ??

[Jinxy]

Hi Guys, this problem started today, i hope its not going to hurt my pocket too much[8|]> on acceleration & when i lift off the throttle i get a knock, its not a dull thud, more like a clatter, its almost like theres a gap between acceleration & engine braking & its at this time i get the clatter from underneath. If i put the car in gear & gently put my foot on the throttle it feels like im taking up slack & then i get the knock ??, if i lift off & let the engine brake again i get the knock, anyone able to help here ?, cheers, Jinxy

 

[Mike_Pollock]

I'm afraid it sounds like the clutch centre.

Sure another voice will come along shortly.

 

[944 man]

It does sound like a failed old type rubber centre, doesnt it? OP: quite expensive, unfortunately.

 

[Jinxy]

Cheers guys, ive had a bit of time to have a read through very similar posts & it does sound like the rubber centre has gone :-( Dammitt !!, Ben at Faze1 motorsport is at the bottom of my road, i'll gingerly pop it down to him in the morning & get him to take a look & quote me a price on fixing it, i know im looking around the £800 mark, could have done without that !!, cheers, Jinxy

 

[944 man]

Oli, a member here, has replaced his own clutch, so its possible if youre reasonably practical.

 

[sulzeruk]

It is not a bad job to do yourself just a bit involved. As long as it is not a turbo, it is quite easily achievable if you are OK with a set of spanners.
Alasdair

 

[Jinxy]

I am handy with a set of spanners Alasdair, but my friend has his car in my workshop, its unmovable ( Bloody typical !! ) & im really short of time too :-(

 

[PSH]

ORIGINAL: sulzeruk

It is not a bad job to do yourself just a bit involved. As long as it is not a turbo, it is quite easily achievable if you are OK with a set of spanners.
Alasdair

The turbo is a pig especially the early ones that have a one piece turbo crossover pipe and even today are still one of the dearest labour cost clutches if getting it done by OPC or specialist. I was lucky and used my sons 4 poster ramp while he was on holiday in Australia, it took a full weekend even with help from my son's friend. I don't think that I would attempt doing an early turbo on a drive, even doing a N/A would be a real test of stamina.

Pete

 

[sulzeruk]

You don't need to take the crossover pipe off to do the clutch.
Alasdair

 

[zcacogp]

ORIGINAL: 944 man

Oli, a member here, has replaced his own clutch, so its possible if youre reasonably practical.

Thanks for remembering Simon!

DIY is possible - indeed not at all hard, it's just a long, long job.

Be warned, I think I paid nearly £500 for the parts when I did mine, and they may be more expensive now. If anyone can change one for you for £800 then it will be a real bargain.


Oli.

 

[Jinxy]

Thanks guys, especially Oli as it was your original posting on the subject that i read on here, so Oli my question to you is, from my description above does it sound the same as the clutch problem you had with yours ?.. i took it to Bens at Faze1 this morning, but hes away until Friday, but a garage Monkey took it round the block & said that it could be the drive shaft or clutch ?... im leaning towards the clutch if im honest due to the fact that once driven then stop, & i take it out of gear & relase the cluch pedal sometimes i get the same clonk, a drive shaft problem wouldnt do that.
Jinxy

 

[PSH]

ORIGINAL: sulzeruk

You don't need to take the crossover pipe off to do the clutch.
Alasdair

Sorry Alasdair but I completely disagree with this statement, the original one piece crossover pipes foul the clutch housing if trying to remove while still in place. In fact Porsche themselves list different labour times between the early one piece pipes and later two piece pipes due to the extra work involved and it is well stated across the web how you can not change the clutch without first removing the crossover pipe, which itself involves removing the inlet manifold to get at the bolts , worse still these bolts have been put through extreme heat variations that make them a real pig to remove. Having done this job myself I can see why the labour charges are so high and testify to the fact that you need to remove the cross over pipe first.
I appreciate that you do this for a living and have vastly more experience than myself, however I stand by what i say here in my reply and can back it up with various guides across the web including the one mostly used by owners on this forum, that being clarks-garage.

regards

Pete

 

[zcacogp]

Tony (Jinxy),

Have to say it does sound like a clutch issue to me. Sorry. My clutch did something similar, but to a lesser extent (it slipped, and juddered a lot when hot - both symptoms of it wearing out.)

The original clutch is cushioned in the drive by rubber. Anno domini and thousands of miles cause the rubber to break up and you end up without less cushion, and hence some lash (slack) in the system. In extremis, the rubber disappears altogether leaving you with a metal-on-metal drive with a large gap, whereupon the lash becomes extreme and it's very aggressive in taking up the drive. (Interestingly, if this happens it is meant to be very unpleasant to drive but not a problem; the damaged parts are all swapped out with the new clutch and you don't do any further damage. An ex-member of this forum called Fen had the same problem as you, and he deliberately abused the car such that all the rubber had gone and he knew it wouldn't get any worse. Some time later he had the clutch changed and all was well again ... )

The updated design of clutch has cush springs instead of rubber (which is what every other car uses anyway.)

A good way of diagnosing it is to take the clutch inspection panel off on the side of the bellhousing and have a look inside. If the rubber in the middle is breaking up then you will have lots of rubber crumbs in there, which is a fairly reliable diagnosis.

Sorry to be the bearer of bad news.


Oli.

 

[PSH]

ORIGINAL: Jinxy

Thanks guys, especially Oli as it was your original posting on the subject that i read on here, so Oli my question to you is, from my description above does it sound the same as the clutch problem you had with yours ?.. i took it to Bens at Faze1 this morning, but hes away until Friday, but a garage Monkey took it round the block & said that it could be the drive shaft or clutch ?... im leaning towards the clutch if im honest due to the fact that once driven then stop, & i take it out of gear & relase the cluch pedal sometimes i get the same clonk, a drive shaft problem wouldnt do that.
Jinxy

A worn driveshaft would give a clonking sound that increases as you accelerate, it's a very distinctive sound.

Pete

 

[zcacogp]

Yes, but wouldn't do the same if you re-engage the clutch with the 'box in neutral, which sounds like another pointer to a clutch failure to me.


Oli.

 

[Jinxy]

Well im taking it to Faze1 on Friday for Ben to take a look at & hopfully get it sorted next week, im off to buy my wallet some headache tablets LOL !!, may well get him to adjust my handbrake while he's at it. Jinxy

 

[zcacogp]

Forgive me asking, but are Faze1 944 specialists? I've never heard of them, and there are some quirky aspects of 944's which are better known about before working on them.


Oli.

 

[Jinxy]

Hi Oli, yes Ben at Faze1 Motorsport races 944's & is also a parts supplier, he's been a big help since ive owned the car even though ive not spent a penny with him, which goes a long way with me, some people on here know him & his racing others dont, but hes a decent guy who knows the Marque well, hes got his workshop in Hoddesdon, Herts & fortunately its a 2 minute drive from my home so thats less for me to worry about... he makes decent coffee too LOL !!.

 

[sulzeruk]

The original one piece pipes should have all been changed for the better two piece one under warranty a long time ago. I have never seen one ( and I have seen a few!)
Alasdair

 

[PSH]

ORIGINAL: sulzeruk

The original one piece pipes should have all been changed for the better two piece one under warranty a long time ago. I have never seen one ( and I have seen a few!)
Alasdair

I have one..

Pete