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'Chattering' on S2

"I assume that getting the sump off is a big job"


yes , been there , done that, got the T-shirt...[:)]

You have to drop the cross member which means front suspension and engine being held by a lift to support it since the engine mounts are attached to said member. Not a quick job in any sense of the word...lol I did it on the drive but guess it will be a lot quicker if you can get it on a ramp


Pete
 
ORIGINAL: trev260764


How the bl00dy hell do I make sure that my Red One doesn't go the same way? I drove to work and back today and
and didn't exeed 2000rpm!
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You have the cam chain + slippers replaced ever 60K miles....
If your red car has more than this now + hasnt had the cams inspected. I STRONGLY recomend you get them checked...
Porsche bNEVER had this as a service item....Obviously they thought it would never wear out.....[:mad:][:mad:][:mad:][8|][8|][8|]
 
Sorry to hear about this.

Did you find out the reason for the failure? Was it the chain which failed and damaged the teeth or the plastic tensioner pad?

I replaced the pad as soon as I got the car (an easy job by the way and no need to change the rocker cover gasket on mine) but am wondering if I should have changed the chain at the same time now.
 
ORIGINAL: Big Dave

So there were MORE than 4 teeth missing.....
And they all be somewhere in the sump. which will need removing to get them out....££££££££££££££££££££££££££££££££

Oh the joys of owning an older Porsche......
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Wouldn't the teeth end up going into the oil filter and stay there, until the filter gets swapped?
 
ORIGINAL: Super_Marv

ORIGINAL: Big Dave

So there were MORE than 4 teeth missing.....
And they all be somewhere in the sump. which will need removing to get them out....££££££££££££££££££££££££££££££££

Oh the joys of owning an older Porsche......
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Wouldn't the teeth end up going into the oil filter and stay there, until the filter gets swapped?
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Nah, there's a mesh screen on the bottom of the oil pickup. You can 99% leave them in the sump and they'll do no harm what so ever. I wouldn't be surprised if they come out when you drop the oil, maybe attached to the magnetic sump plug.

Much more dangerous than the teeth would be any little bits of swarf which the chain has removed from the cams/tensioner and even these would be picked up by the filter once they end up in the sump.
 
On a 968 i had.
The cams had 10 teeth missing...[:mad:][:mad:]
Thankfully ALL 10 were found in the bottom of the sump...
And im glad i had the sump removed otherwise it wouldve constantly niggled me , just quite where they were + if they were going to cause more damage...
I still have the "old" cams, as a momento / reminder....
 

ORIGINAL: Big Dave
You have the cam chain + slippers replaced ever 60K miles....
If your red car has more than this now + hasnt had the cams inspected. I STRONGLY recomend you get them checked...
Porsche bNEVER had this as a service item....Obviously they thought it would never wear out.....[:mad:][:mad:][:mad:][8|][8|][8|]
Click to expand...
This has been touched on here before, but never directly addressed; how do you inspect the cam chain for signs of wear? Also, how to do you inspect the sprockets for signs of wear?

Or is it simply a case of changing them every 60k, no matter what?


Oli.
 
I guess you change them to be safe. I'd be interested to hear from Trev whether the plastic slipper pad had gone brittle and disintegrated.
 
Took a look at the cam yesterday and got a pic with my phone (hence vague quality!). Teeth clearly missing, but slipper pad appears totally intact. Do you reckon the tensioner has caused this? Suspect gasket shows oil build-up around (and into) plugs. Replacement cam has arrived and will be fitted shortly. £300 labour, £49 cam. Could be worse!!

Car has started to have quite a bit of interest now - so hopefully a sale is pending...

My Red Car has 'masses' of paperwork which the seller is going to forward to me. Eventually. I am eagerly awaiting this as I will be specifically looking for documentation on the tensioner. At the moment I am driving it with extreme caution. Once bitten etc.

Save me trawling the forum for the issue and for clarification. Where's the best place/s to obtain the assembly? Cost and is it DIY? Whole assembly, or just the slipper pad? Every 60K I know!


6DC2A2E029AB4C67BB97B51CAEA459C4.jpg
 
Interesting, I can't see why the cam would loose teeth wth no apparent chain/tensioner damage.

Do the other teeth look worn?

You mention a price for one cam, are you not replacing the tensioner, chain and the other cam at the same time?
 
Er, no. The inlet cam is fine. I'm selling the car and it developed this issue after I lsted it. I will recomend an inspection of the tensioner to the newowner of course.
 

ORIGINAL: trev260764

Took a look at the cam yesterday and got a pic with my phone (hence vague quality!). Teeth clearly missing, but slipper pad appears totally intact. Do you reckon the tensioner has caused this?
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The cam teeth can fail due to the chain stretching over time. The distance between links increases, therefore putting pressure on the sides of the teeth as the chain engages. Same thing actually happens to bicycle cassettes - chain stretch accelerates wear of the teeth - they don't usually break though, just wear down. The chain should be replaced at least every 50,000 miles, probably 30,000 would be a safer bet.
 
ORIGINAL: Eric_Oz_S2


The cam teeth can fail due to the chain stretching over time. The distance between links increases, therefore putting pressure on the sides of the teeth as the chain engages. Same thing actually happens to bicycle cassettes - chain stretch accelerates wear of the teeth - they don't usually break though, just wear down. The chain should be replaced at least every 50,000 miles, probably 30,000 would be a safer bet.
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First time I read that I though you meant the bicycle chain LOL you must be very fit cycling 30,000 miles [:D][:D]

 
Anyone know how much the chain is from OPC and how tricky it is to install? I assume it needs feeding round the cams and then joining together with a split link?
 
ORIGINAL: zcacogp

Good Q.

I don't think it has a split link, neither do I think it breaks. I think it's a cams-out job.


Oli.
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Just found this http://www.porscheshop.co.uk/acatalog/porsche_944_engine_components.html which has the cam chain for £20. it seems like it's one piece so I guess that means cams out, which means cambelt off [:(]

I changed the tensioner pad in mine when I got it but didn't look closely at the teeth. Might have to open it up again and inspect the cam teeth as I'm getting worried now!

It'd be good to have a good, close up photo of a new cam so we can compare to the original tooth profile and see how much wear there is.
 
I think Rick had pretty good pics when he did the slipper on baby Wuf. Anyone care to search his millions of pictures for me? [&:]
 
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