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(Post Link) post #1 of 31 Old 13-09-07 Thread Starter
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Engine Rattle? ..... 156 2.5 V6

Hi everybody, I'm the proud new owner of a T reg 156 2.5 V6, shes done 104k, cambelt changed 10k ago, and full service just before i got her about 6 weeks ago.

Shes recently developed a noticable 'Ticking/rattling' noise which isn't there at tickover but appears when shes revved slightly, then disappears as the revs increase and reappears as they decrease and disappears again at idle.

I've had a mate of mine who's an ex mechanic listen to it and he's baffled because the noise disappears at tick over. it appears to be coming from the back rocker cover at the cambelt end as near as i can tell.

I must admit i'm worried especially as I'm doing a 600 mile round trip in her at the weekend. so any help or advice you guys could give me would be much appreciated, especially as this is my first Alfa!
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Re: Engine Rattle? ..... 156 2.5 V6

It sounds like a cambelt issue when it was done 10k ago was it by an alfa dealer because if cam locks were nt used the noise will be the belt whipping on the rear cam. Is it worse when cold? Best get it checked out asap.
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Re: Engine Rattle? ..... 156 2.5 V6

I noticed it for the first time this morning tried it a few times during the day and the noise was still there however stopped off on the way home from work and its gone! running sweet as a nut!

rang a friend who's had a few alfas including my model and he reckons it could be a sticking hydraulic tappet. he also said they are very fussy when it comes to oil and he always uses mobil 1, although the oil was changed at the last sevice 2.5k ago it wasn't an alfa dealer and I dont know what oil they used. the oil level by the way is spot on the upper mark and hasn't moved since i got her 2.5k ago.

Anyone got any thoughts?
would it be worth changing the oil for a fully synth like Mobil 1?
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Re: Engine Rattle? ..... 156 2.5 V6

Have you got the reciept for the cam belt change mate, and if so what does it say was done exactly?
 
(Post Link) post #5 of 31 Old 14-09-07 Thread Starter
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Re: Engine Rattle? ..... 156 2.5 V6

Receipt says 'Cambelt Kit' done at 90k thats 14k ago doesn't mention a water pump,from the receipt doesn't look like an Alfa dealer but is a high performance and tuning specalist, specialising in BMW's.
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Re: Engine Rattle? ..... 156 2.5 V6

It sounds to me as if it could be a sticking tappet, but I would not rule out a cambelt issue.
It seems strange that the noise has only appeared 14k after the belt change, it could be that the tensioner was not set tight enough, and now the belt has settled there is too much slack in it.

I also had problems with a ticking Twin spark a while ago, it turned out that a spark plug was loose in its hole, the ticking being caused by gas escaping past the threads.

Firstly as you say, try changing the oil, and maybe using some flush first, and see if that helps.

I hope that gives you some things to go on.

Giulietta 2.0JTDm (170), BMW 335i Cabrio
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Re: Engine Rattle? ..... 156 2.5 V6

Quote:
Originally Posted by wabsy View Post
Receipt says 'Cambelt Kit' done at 90k thats 14k ago doesn't mention a water pump,from the receipt doesn't look like an Alfa dealer but is a high performance and tuning specalist, specialising in BMW's.
Specialising in BMW's? Well, the previous owner was on the right path, but then fell off of it by the sounds of it,

To be honest mate, 'Cambelt Kit' should be fine, just get in changed again at its next due date and you should do OK.

How does she drive though?
 
(Post Link) post #8 of 31 Old 17-09-07 Thread Starter
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Re: Engine Rattle? ..... 156 2.5 V6

Hi ... just an update,.... have noticed the 'Rattle' goes once the engine temp gets above about 70c she then runs as sweet as a nut, Got a mate of mine who's an experienced mechanic to have a look and he's convinced it's tappet noise, he's suggested a fully synthetic 5-40 or 0-40 as he reckons a decent oil of the right viscosity will circulate better from cold and should cure the problem. Although the guy I bought her off had her serviced just before he put her up for sale it was done by his mate at a small garage, and my mate reckons they probably used a cheap semi-synthetic that now about 4k later is starting to break down and become thicker.
In any event an oil change to some decent stufff seems a sensible option before going any further. Doing that tues/weds so will post how it goes.
Anyone any oil recomendations given the nature of the problem?
This little issue aside this is my first Alfa and i'm smitten, she's a joy to drive and goes like a rocket! Never fails to put a smile on my face
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Re: Engine Rattle? ..... 156 2.5 V6

I always put the Selenia oil in my 156 as this is what Alfa recommends. Think it's about 7.50 a litre from the stealers.
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Re: Engine Rattle? ..... 156 2.5 V6

Wabsy, everyone will probably advise you on getting 10w 60 Selenia oil because it's the best.

I however found it extremely hard to get hold of and used 10w 40 Semi Synth Castrol GTX instead.

As long as you use premium 10w 40 or higher, you should be alright.

But do try and get Selenia for the change, as it is supposedly amazing, and what Alfa recommend.

It should actually be stamped on the front mount of your engine bay on a red sticker I think? Have a check, I don't have my car anymore
 
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Re: Engine Rattle? ..... 156 2.5 V6

Don't think these engines have tappets. They have camshafts that act directly on the valves via (upturned) buckets with shims inside that adjust the clearance

It is always possible that one valve has a broken shim, or that the clearance on that valve is a little widerr than the others. Both would give a ticking noise. They don't have hydraulic tappets, so its not a slack/bunged up one of those. IMHO its NOT worth pulling the cams out on the off chance its a broken shim..which is quite a rare thing to occur.

My V6 could be a little tappetty tappetty at times, but I never worried unusually. Also don't mistake the tick tick of the injectors for a tappet noise..which is easily done.

Not sure what to advise, and I suspect changing oil type will make no difference. Just stick to the grade Alfa recommends in a good quality semi synth. You can't go wrong at that.

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Last edited by AlfaLincs; 17-09-07 at 19:51.
 
(Post Link) post #12 of 31 Old 21-09-07 Thread Starter
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Re: Engine Rattle? ..... 156 2.5 V6

Hi ... just an update ... did an oil and filter change (Castrol fully synth) 5 40 and no difference! The rattle is from cold and completely disappears once engine temp has reached about 60c ....Any ideas anyone ...... before I get her 'Looked at'?
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Re: Engine Rattle? ..... 156 2.5 V6

The manifold heat shields can rattle there is one at the front and one at the back, or it could even be your cat.If you can get it up on ramps take the under-tray off and have a listen.

Allan
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Re: Engine Rattle? ..... 156 2.5 V6

Is there a clamp on the exhausts under the engine..it could be loose and rattle when cold..then stop as the pipes expand.

Just a thought.

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Re: Engine Rattle? ..... 156 2.5 V6

5w 40? Is that too low? I always thought 5w was too low, might be wrong though...
 
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Re: Engine Rattle? ..... 156 2.5 V6

I agree darren, and i said in one of my posts he should stick with manufacturers recommended..which is 10w40 as far as I know.

Not all engines like this super thin stuff..for reasons I don't really know.

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Re: Engine Rattle? ..... 156 2.5 V6

Quote:
Originally Posted by Darren156 View Post
Wabsy, everyone will probably advise you on getting 10w 60 Selenia oil because it's the best.

I however found it extremely hard to get hold of and used 10w 40 Semi Synth Castrol GTX instead.

As long as you use premium 10w 40 or higher, you should be alright.

But do try and get Selenia for the change, as it is supposedly amazing, and what Alfa recommend.

It should actually be stamped on the front mount of your engine bay on a red sticker I think? Have a check, I don't have my car anymore
Quote:
Originally Posted by wabsy View Post
Hi ... just an update ... did an oil and filter change (Castrol fully synth) 5 40 and no difference! The rattle is from cold and completely disappears once engine temp has reached about 60c ....Any ideas anyone ...... before I get her 'Looked at'?
Wabsy, was there something you didn't quite believe regarding my advice? First off, you should have used Semi-Synth, and secondly, 5w 40 IS too low.

Changing the oil to the wrong specification and then coming back to us to let us know it still isn't fixed seems a little redundant to me.

If you had of changed the oil to a Semi Synth 10w 40 (As per the manufactuers guide) and still not had the car starting up okay, then we could have moved onto the next step.

As it is though it still may be the oil as you have changed it to the wrong spec, possibly the spec oil that was already in there.
 
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Re: Engine Rattle? ..... 156 2.5 V6

What Darren 156 and AL said. My Thema 16v Turbo did not like the 'super thin synthetic' stuff AL mentioned. My 'Guru' told me a few possible reasons, but the rattle went after putting the 10/40 back in the sump. Fortunately I had done virtually zero miles, so that synthetic was in, then out. Back to 10/40 semi.:
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Re: Engine Rattle? ..... 156 2.5 V6

Hi Wabsy

Have you got an update on what occured?

I seam to have got the exact same problem with my 2000 V6. She rattles just off tickover and goes quiet after 50 degrees c.

Doesn't seem to effect performance.

I have always used Selenia 20k Changing at 6k.

Colin

Last edited by colinbull; 03-07-08 at 10:00. Reason: Spelling mistake
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Re: Engine Rattle? ..... 156 2.5 V6

A ticking until the engine is warm can often be a cracked exhaust manifold, as it warms up the heat seals the crack and the noise stops.
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Re: Engine Rattle? ..... 156 2.5 V6

My friendly mechanic has just diagosed my rattle as the Cam Belt Tensioner.

Lucky it rattled before giving up!
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Re: Engine Rattle? ..... 156 2.5 V6

Hi colin

Taking mine to the dealer ASAP for a once over, any news on how much the tensioner will cost to replace?
Incidently mine had a Cambelt change including the tensioner 12k ago
Do you know when yours was changed?
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Re: Engine Rattle? ..... 156 2.5 V6

I had my first cambelt around 72k she's now on 115k.

I have had the full cambelt, tensioner pulleys, idlers and water pump done - totaling £680

definatley cured the rattle though

(try and find a local specialist, i don't like main dealers)
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Re: Engine Rattle? ..... 156 2.5 V6

Oh this is exactly the problem I am having with mine, ticking at low revs. Mr RAC said it's a cambelt tensioner but didn't know if it could just be adjusted or better to replace the whole lot.

Wabsy - what's your outcome?

Colin - who did you use in Southampton?
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Re: Engine Rattle? ..... 156 2.5 V6

I've a distinct ticking from my V6. On mine, it's not the cam belt tensioner/idler/aux belt as these have just been done. Sounds like it's coming from nearer the top of my engine - could it be an arcing coil or injector noise?
 
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