Loud knocking noise from my 2.0 litre twin spark - Alfa Romeo Forum
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(Post Link) post #1 of 28 Old 28-02-15 Thread Starter
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Loud knocking noise from my 2.0 litre twin spark

Hi all,
It's been a while since I've posted anything here as I have had trouble free motoring for two years now.
The other day I was driving on the expressway doing about 110kmh and the engine developed a loud noise.
At first I thought it was a loud Tappett noise but then it developed into a very loud knock.
It all seems to be coming from the top end and not the bottom end. The noise is always there but varies in intensity.
The engine starts and runs but I'm afraid to run it too long (in case something like a camshaft actually breaks, the knock is that loud) to be able to determine exactly where the noise is coming from.
I removed the coil pack and plugs and cranked the engine and there seems to be no interference as the engine cranks over without any noise.
Any advice or help would be much appreciated, before I start stripping the engine.

Thanking you in advance.
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Post a video of the noise
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(Post Link) post #3 of 28 Old 28-02-15 Thread Starter
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Ok will do tomorrow.
Thanks
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Sounds from the description very much like when my Crankshaft let go.

Has it had a cambelt snap in the past and the head repaired? I found out that mine had in the past and it could have been avoided by replacing the bearing shells. Other causes are running them low on oil.

Hopefully it is nothing as serious, but the car selling sites are full of very cheap Twin Sparks with snapped belts or knackered cranks.
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(Post Link) post #5 of 28 Old 01-03-15 Thread Starter
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Not having much luck uploading the video.
IT experts ( my kids) will help me soon.
Starting to lean towards a failed hydraulic lifter as the noise seems to get extremely loud, then does get quieter, then gets louder.
Anyway I'm working on uploading the video. IT are saying I may need to post it to youtube, then post the link here???
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Yes that'll work.
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Normally on TS engines knocking noises are caused by a failed big end. Most often number 3 as it sits above the exhaust cutout in the sump and is first to suffer due to the extra heat.

Has the car ever been run low on oil or had a cambelt snap in the past?

Sometimes a failed big end can cause a noise at the top of the engine due to the extra movement allowing the piston to touch the cylinder head.
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Normally on TS engines knocking noises are caused by a failed big end. Most often number 3 as it sits above the exhaust cutout in the sump and is first to suffer due to the extra heat.

Has the car ever been run low on oil or had a cambelt snap in the past?

Sometimes a failed big end can cause a noise at the top of the engine due to the extra movement allowing the piston to touch the cylinder head.
Mine sounded like top, but I knew in my heart it was the bottom end.

A very expensive garage bill.
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(Post Link) post #9 of 28 Old 05-03-15 Thread Starter
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Haven't looked into this any further as making a living got in the way.
Once I have the time will get to the bottom ( or the top) and let you all know
Thanks for the advice!
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If it is the bottom it will get worse very quickly.

Probably within the space of minutes or miles rather than hundreds of miles.
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I've had a loud knock from my engine twice now. Both times it has turned out to be a failed balance belt tensioner.

You might be lucky.
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(Post Link) post #12 of 28 Old 06-03-15 Thread Starter
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Hi everyone,
Here is the youtube link.
I am leaning towards a failed lifter but with a twinspark, who knows.
Will be pulling it apart today so will keep you all updated.

http://youtu.be/er8MlkkWzaE
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Seems to quieten down at times. You might be lucky and it is a lifter.

However at its loudest it does sound like when my TS crank let go.
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(Post Link) post #14 of 28 Old 12-03-15 Thread Starter
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Hi all, I've ordered a set of lifters today so should have them in a week.
Google took me to a youtube video of a bottom end knock on a twinspak and it is definitely a different sound. It's a constant knock which doesn't change.
Fingers and toes crossed.
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Does it change with revs. It does sound like the bottom end.
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(Post Link) post #16 of 28 Old 13-03-15 Thread Starter
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Hi Scottyf,
I've actually run the engine with the rocker cover off, (bit messy with oil) but definitely sounds like top end. In Barrister speak "its a definite possibility"
Doesn't change with revs as you can see it's idling and the sound changes. I could be wrong but I've heard bottom end knocks and they have a constant sound regardless of engine revs.
Hey if I'm wrong I will have a new set of lifters to add to my inventory!
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Have you checked the torque on the cam-shaft journal caps? Could be the alloy (head) thread insert is stripped or damaged through metal fatigue (or over-tightened/stripped following an earlier cam removal).


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Did you get to the bottom of this?
My engine sounds exzactly the same after cam and balance belt change. I have just replaced the tappets on inlet side and its still there. I hope Mitch is correct and a few other threads suggest he is, (fingers crossed) so im pullibg my balance belt off tomorrow..

Last edited by EauRouge; 29-06-15 at 07:44.
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Eaurogue, What was your timing like before the belt change and did you use cam locks for the belt change?

My engine sounds pretty rough but not like that. My balance belt broke a long time ago so it won't be that.

If it does turn out to be the big ends, You are experienced enough that I doubt you would have any issue in replacing them.
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Hi Ransoman, spent this morning getting the belt covers off and then removed brand new balance belt and "New" tensioner and reconnected battery, said a prayer to Alfa God and fired her up. ......


........ Sweet as a nut!

I would have sworn it was a camshaft but that top end knock was a bloomin balance belt tensioner! The bugger is now removed and she can run without a balance belt as i reckon they are more hassle than they are worth.

Used camlocks and dial guage to set timing previously and just finished checking again, with serviced tappets she is now running smooth as silk.
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I'm running without the balance belt too. Sick of the bloody thing.

Slight increase in vibration above 4k revs but i can live with it.

Hope to MOT next week
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Good luck Mitch and cheers again for pinpointing my knock, id never have guessed it was the balance belt tensioner.
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(Post Link) post #23 of 28 Old 29-06-15 Thread Starter
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Hi Eau Rouge, I've purchased all the parts, but haven't had the time to fit them.
In fact I was only saying to my partner yesterday that I need to get on to fixing this car.
I plan to have it done in the next few weeks and will update everyone.
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Hi converted,

forget about the tappets and just remove your balance belt and tensioner, 1-2 hrs and you will cure your problem.

PS: Your noise from the utube video is/was identical to the alarming noise/knock i had.
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Quote:
Originally Posted by EauRouge View Post
Hi converted,

forget about the tappets and just remove your balance belt and tensioner, 1-2 hrs and you will cure your problem.

PS: Your noise from the utube video is/was identical to the alarming noise/knock i had.
I did mine in 15 minutes. Aux belt off, Aux tensioner off, Upper cam cover off. Pull the broken fragments of the Balance belt out and reassembly is the reverse of removal

Of course, If your balance belt is still intact then you might not want to do this.

My GTV has no balance belt and no Aircon (shorter belt fitted). It revs beautifully now but is as rough as a badgers **** above 5k (though I suspect it is more down to the general poor health of the engine). Removing the aircon pully from the system increased the Fuel economy by 4 mpg and made it accelerate a liltte quicker.
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