Don't have an account yet? You can create one. As a registered user you have some advantages like theme manager, comments configuration and post comments with your name.
AS per subject line, I have a loud ticking/hammering noise coming from what sounds like the cambelt cover area.
It is not the brake vaccuum pump as i think i can hear both the ticking noises at the same time and this one is significantly louder.
Ticking increases with revs until about 1500rpm then always dissapears.
Noise is there regardless if engine is hot or cold.
I have disconnected the aux belt setup and the noise is still there so it is nothing on the drive belt setup causing it.
Car performs as normal, smoke, acceleration, fuel consumption is all normal. Oil and coolant levels are ok.
Any ideas ????
spink Bandwidth Buster
Joined: Aug 12, 2006
Posts: 714
Posted:
Sun Jan 15, 2012 8:41 pm
I recently broke an a6 which had the exact same symptoms for several weeks,owner ignored it(not sure if the noise disappeared after 1500rpm or not though) and this is what happened.
Head was completely written off and also the piston had a huge hole in it,cam was ok as was timing belt.I presume it was a knackered Tappet,I have an s8 in bits at present which has the same noise and that was defo down to a worn out Tappet(valve wasn't returning to the seat properly until Tappet was removed) this happened after a 160mph blast.
If I were you I would stop using it and investigate.
If you can borrow a camera that can be passed down the glow plug hole you may be able to see one of the valves not seating properly when it is meant to be closed,thats how I managed to find the issue with the s8 at least
alynrtiedtke Newbie
Joined: Jun 18, 2011
Posts: 9
Posted:
Sun Jan 15, 2012 9:01 pm
Oh not good, is that on an AEL ????
Quote:
this happened after a 160mph blast.
Ironically enough a couple of days before the sound started I had been thrashing the car quite hard, always with a warmed up engine of course.
Oddly though the sound started immediately after the car had been parked for a good 8 hours. It was never apparent before that.
Can these Tappets be replaced or is this a big job ??
So what causes the tapping noise, it cant be the piston hitting the valve ?? Is it the cam lobe smacking the lifter ??
Thanks for the reply. I've not really posted much on this forum but have always been an avid browser.
that engine is an AAT but is identical to an AEL bar the pistons
with the s8 I would say the piston was hitting the valve and helping it back to its seat on every revolution,it was making 1 very loud tap every second or so,I never heard the a6 running as it came to me knackered already.
The Tappets can be replaced and are cheap,probably £8 each I would have thought.Probably an idea to do the full timing belt job on it at the same time if it hasn't been done in the last 50000 miles or so.Certainly not the easiest DIY job as it needs a few special tools and locking of the cam etc,I think there is a guide on here how to do it by 'bladerunner' but the haynes manual gives a good guide to it aswell.If you take your time with it there is no reason you can't make a good job of it.
The chap in the video mentions that it was his timing that had slipped due to the key shearing off,this is a common problem and happened on my s6 last year(while on a track day) luckily I managed to find the issue before It completely let go and trashed the engine.If you do the timing belt make sure you change it anyway,along with the vibration damper(if it hasnt been changed in the last few years).Not a cheap job but once done you ought to have 50000+ miles trouble free as the timing belts/and associated parts seem to be the only thing on these engines that cause major problems.
Just a thought but it may be worth changing the oil and adding some of that slick50 kind of stuff,may be a waste of time but you never know.
alynrtiedtke Newbie
Joined: Jun 18, 2011
Posts: 9
Posted:
Thu Jan 19, 2012 10:45 pm
spink wrote:
Probably an idea to do the full timing belt job on it at the same time if it hasn't been done in the last 50000 miles or so.Certainly not the easiest DIY job as it needs a few special tools and locking of the cam etc,I think there is a guide on here how to do it by 'bladerunner' but the haynes manual gives a good guide to it aswell.If you take your time with it there is no reason you can't make a good job of it.
The chap in the video mentions that it was his timing that had slipped due to the key shearing off,this is a common problem and happened on my s6 last year(while on a track day) luckily I managed to find the issue before It completely let go and trashed the engine.If you do the timing belt make sure you change it anyway,along with the vibration damper(if it hasnt been changed in the last few years).Not a cheap job but once done you ought to have 50000+ miles trouble free as the timing belts/and associated parts seem to be the only thing on these engines that cause major problems.
Just a thought but it may be worth changing the oil and adding some of that slick50 kind of stuff,may be a waste of time but you never know.
So my local grease monkey took a look at this today, turns out the cambelt was loose and it was flapping about and hitting the cambelt cover causing the noise. So im pretty lucky it hasnt snapped and totalled the engine.
He's reccomended that I have the belt changed, along with the tensioner. Pump belt done along with the tensioner and idler. I have also opted to have the water pump replaced along with the crank oil seal, oil and filter change and coolant aswell.
He mentioned to service the seal that the oil pump needed to be removed and to remove that the oil pan needed to be dropped, so i need a sump gasket also.
He's not quoted me yet, but its gonna be around the £500 mark i reckon.
Many thanks spink for your replies bud.
spink Bandwidth Buster
Joined: Aug 12, 2006
Posts: 714
Posted:
Sat Jan 21, 2012 11:22 am
that was lucky,make sure you replace all the bits that bladerunner suggests in his thread.And also the vibration damper,infact if you aren't too far away from chesterfield I would get in touch with him and see if he can do it as I doubt there is many people in the world who would do a more thorough job.
alynrtiedtke Newbie
Joined: Jun 18, 2011
Posts: 9
Posted:
Sat Jan 21, 2012 11:23 am
spink wrote:
make sure you replace all the bits that bladerunner suggests in his thread.
could you provide a link ??
spink Bandwidth Buster
Joined: Aug 12, 2006
Posts: 714
Posted:
Sat Jan 21, 2012 11:36 am
this one for a start for the vibration damper plus it has links to other threads,there are more but I have to go out now.
View next topic View previous topic
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You can attach files in this forum You can download files in this forum
Forum FAQ
Search
Memberlist
Usergroups
Profile
Log in to check your private messages
Log in
