Does this sound like a sticking tappet? V6 3.0 - Alfa Romeo Forum
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Does this sound like a sticking tappet? V6 3.0

Hi everyone,

Could someone have a quick listen to this please:

02102009083.mp4 video by benje_01 - Photobucket

This only occurs when the car has stood for a good while and is started for the first time (i.e. it's cold) and it dissappears after 30 to 60s of driving, It's never there on a warm start. I'm convinced it's a sticking tappet, to which I'm reading conflicting ideas of how to solve it (other than to replace the tappet )

Thanks all

Ben
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It's difficult to tell from your video, but if the noise goes after 30-60sec I'd say it's not a sticking tappet - that would rattle all the time. More likely, if it's a tappet, to be one that's under load when the engine is stopped & just taking a few seconds to pump up. Personally, I wouldn't worry about - it's something I've had on a couple of cars & regarded as just a characteristic of hydraulic tappets.
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The start up noise is defo a lazy lifter as you can here it go quiter. Quite common on higher millage alfas. the only cure is to replace the lifter. The noise when you rev though sounds different. Almost like the belt is clicking if you know what I meant. I heard stories of hydraulic tensioners becoming lazy with time and so the cambelt is slightly slack until the pressure builds up which would give the characteristic belt click but its hard to tell with your camera in that position. Next time can you get someone to start the car while the bonnet is up and then you film the engine. Its hard to tell if the second noise is belt click or just the lifter filling up. Don't want to worry you mate but just covering all angles !

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I'll get a better video later with the bonnet up. I had the cambelt covers off at the weekend to check if it was cambelt related, but couldn't spot / hear anything as I'm convinced it's coming from under the camcover of the rear bank...

I'll update this later.
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Well if you've had the covers off and run it up with no sign of the belt making the noise and being slack then I'd say its just that lifter which is up to you to change. Its not vital although it will eventually wear the cam lobe and reduce your power a little as the flow into that cylinder will be less. Bit of a job to change on the V6 but not impossible. More just timeconsuming for you.
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Ok latest video:

03112010106-1.mp4 video by benje_01 - Photobucket

Taken from the offside suspension turret. It's seems to come and go at a certain RPM, which to me sounds like it mot not be tappet related?
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I reckon you might have a loose spark plug.

Can you smell fuel with the heater on?
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Can't smell anything Simon, I might try and take the rear cam cover off tomorrow, have a look see if I can spot anything. Why did I buy another 90's italian Coupe!? Going the same way as my Fiat
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Quote:
Originally Posted by benje View Post
Can't smell anything Simon, I might try and take the rear cam cover off tomorrow, have a look see if I can spot anything. Why did I buy another 90's italian Coupe!? Going the same way as my Fiat
Because you can't help yourself buying Italian cars.


I would have another 20VT tomorrow (If I was allowed to)
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That tick really does sound like belt tick form a slack belt. Your right it doesn't sound like a tappet. I'm thinking out loud here but valve spring cotter may have come out and is moving around under the spring and lifter. It might not have dropped the valve as the other half of the cotter has wedged it so its still working. The other thing it sounds a bit like is when I had to drill out a plug and couldn't get the plug tip out of the cylinder head. So I started the car and let it clear itself. Ticked like that in random way too but it cleared itself after 30 secs.
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Not sure but i ahve heard something like this before and a mechanic friend diagnosed a manifold gasket blowing when cold then as the car warms up the noise goes, i had a very similar noise on a V6 which went once the car was warm, Does the noise eventually go.
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Cheers gents.

The noise does go eventually, however I thought it was after 40 seconds-ish, I think it's more like 5 minutes after listening to it properly....

I'll check the manifold see if I can spot/feel anything.
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Have you solved the problem on your car yet, or does anyone else have any ideas as to what the noise may be.
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(Post Link) post #14 of 19 Old 08-12-10 Thread Starter
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Hi Topkit,

I never got round to looking, mainly due to me not using the car properly in the winter and also due to my back box breaking. I might have a look this weekend if it gets a little warmer. I'm hoping it's a gasket issue as that will be easiest to fix (Famous last words)

Cheers

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Have you had any luck with this problem on your car,It may be worth posting this over in the gtv 916 forum too, There are a lot of v6 owners in that forum.
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Right just to bump this back up. I believe I have found what was causing this

Look at the photo and see where the pointer is, ?!$!$?!? miles off. Changed by a specialist 2 years ago as well!

So, my question is, Can I just tighten this back up?
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I was going to say, that is the belt! I know because mine was making the same noise - the bearing in the tensioner was almost worn out, causing the tensioner wheel to tip, walking the belt off the pulleys. I *just* caught it in time, any longer and the belt would have shredded and bye bye valves!

As for your tensioner - I would replace it, the risk of it falling apart is too great.
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My first thought after hearing it was the same as TOPKIT - slight leak at an exhaust port when cold. I say that, as it only seems to do it on acceleration....

The tensioner...well, before diving in, run it up like that and watch what it does. It'll tend to wave about quite a bit as you rotate the engine anyway - that's normal as the tension varies on the slack side due to valves opening/closing. Or, see where it sits with the engine at #1 TDC

BUT, as bgunn says...any doubts, change the belt, idler & tensioner. Not cheap...but cheaper & quicker than an engine rebuild.....
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Just to add, I finished a mammoth belt change/leak curing job on my V6 last night and with a new belt and tensioner wheels, it's silent and no longer has all of the chattering and belt slapping noises it had before. The noise has been replaced with the whirr of a new, properly tensioned belt, and the engine is otherwise silent, which isn't bad for a 117k lump..
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