As above, what is likely to be the cause of the CAS appearing to wobble slightly while the engine is running? My first port of call was to pinch up the the three bolts - which resulting in one snapping with the slightest tweak! So if anyone has a CAS bolt going spare please let me know as my local fasteners shop provided the closest match they had which doesn't fit.

 

Also, does anybody know if this is likely to be the cause of my car struggling to idle? It idles terribly and I'm aware it has an exhaust leak and possibly a few boost leaks but I didn't expect it to affect it like this especially as it seems to rev cleanly(ish). My thoughts were that the CAS reading is likely to be slightly out as the CAS moves around.

sounds like its not meshed with the shaft cutout...when it goes in it should sit perfectly flat on its housing...its only held by three 6mm x 1.25P bolts and thats the most common size on a zed and easily obtainable anywhere as long as you know the length which atm i cant remember..

Edited September 28, 201510 yr by znut

You shouldnt see the cas move at lol

Only seen this once before, and it was the result of a bent CAS shaft. It made the CAS bracket and nearside cambelt cover undulate. No running issues though, sounds as if you could have a few problems that require diagnosing & fixing.

Edited September 29, 201510 yr by Noz

Noz - The shaft didn't look bent as that was my first thought. It is possible the CAS has received a knock when due to where the engine was stored when I removed it to change the turbos (long storey) and it hasn't run properly since then.

 

With regard to the other running issues - are you volunteering to see if you can sort them out for me?:wink: I would still like it mapped by you if I ever get it finished!

Bad Bearings in CAS can make it wobble ...

Noz - The shaft didn't look bent as that was my first thought. It is possible the CAS has received a knock when due to where the engine was stored when I removed it to change the turbos (long storey) and it hasn't run properly since then.

 

With regard to the other running issues - are you volunteering to see if you can sort them out for me?:wink: I would still like it mapped by you if I ever get it finished!

 

Hahaha. Bring it over to the dyno and I'm sure we can get it running as it should be :)

The most lightly culprit is alignment of the CAS bracket or the drive peg is bent in the end of the cam,if it is be very care as they are brittle and can snap

Edited October 1, 201510 yr by jimmer
typo

Noz - I may just take you up on that! I have given up on trying to find the time to finish it myself so I am putting my A3 3.2 daily driver up for sale to fund somebody else finishing the welding and bodywork for me and then it'll be onto getting the running sorted and getting you to sort a map to get as much power as possible. Fingers crossed it should happen in the near future.

 

jimmer - Is there any definitive way of checking the alignment of the bracket? Or do I just take the belt cover off and have a look? As I said - the CAS peg didn't look bent but that doesn't necessarily mean that it isn't. You can mostly see the CAS move when the idle wonders to 500rpm or less. At higher revs you can't see the wobble.

Vern just need to clarify where your observing the movement on the case unit, check the picture out and say where it is A,B,C or other.

 

Jeff

 

I would say the whole assembly appears to move in and out in the direction of the 'B' arrow of your picture. You don't see a gap appear between the CAS and the bracket its as if the whole lot moves. Perhaps the best thing to do is see if I can get a video of the movement....although there is currently only two bolts in it due to as I mentioned above my local fasteners shop couldn't provide a bolt that fits for some reason - I haven't got around to trying somewhere else yet as there's no rush as the front halves of the sills are not currently attached to the floor :scared::whistling:

 

All advice is much appreciated!

I would say the whole assembly appears to move in and out in the direction of the 'B' arrow of your picture. You don't see a gap appear between the CAS and the bracket its as if the whole lot moves.

All advice is much appreciated!

 

If the whole unit is moving then the next step is to remove the right hand front cambelt cover and check the fixings for the bracket as shown in the picture below.

 

Jeff

Ahhhh yes it seems obvious now you mention it...the problem must be with the bracket. I'll see if I get time to have a look tomorrow.

 

Cheers for all the help.