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Author Subject: Does this sound normal?!
Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

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Post #1
Hi gents

I've been paranoid since the day I bought it but it's sounding particularly rough today so would appreciate your thoughts...

She's an old girl, done 159k miles, serviced every 5k miles, golden oil, doesn't burn any, doesn't smoke, goes well (equal with a clio 172), starts without fail, but God it sounds like a bag of nails!

It's also had a richw rebuilt head and 16 new valves back in 2011 (8k miles ago)

It's done one Trackday in my ownership and will be doing another in feb, just hoping it'll keep going. Ultimately trying to establish if it's just sounding well used or a 'tapper' or just about to die lol

Video


Posted 5th Jan 2015 at 17:30
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lj_6

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Location: Bristol

Registered: 19 Jan 2010

Posts: 246

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Post #2
Definately doesn't sound normal !the few things that I've had before that can contribute were a loose plug ! Worth checking those. and also checking the exhaust manifold. The nuts could have come loose. Try that. For now perhaps ?

________________________________________

Astra burg #365 Garrett Power
'99 bodied 6 track project
Posted 5th Jan 2015 at 17:33
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Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

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Post #3
on a side note the harsher vibration is the bumper vibrating...
Posted 5th Jan 2015 at 17:33
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Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

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Post #4
ok will have a look at those asap, thanks

On reflection what I'm terrified of is the bottom end going...
Posted 5th Jan 2015 at 17:49
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pete-gti

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Location: Kent

Registered: 15 Feb 2009

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Post #5
Spark plugs maybe , she old girl dot forget she been around want sound perfect lol
Posted 5th Jan 2015 at 17:59
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Chr1sch

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Location: Worcester

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Post #6
Slightly worried as I did the pugs about 500 miles ago lol
Posted 5th Jan 2015 at 18:00
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cully

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Location: Cullompton

Registered: 12 Jun 2013

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Post #7
cracked exhaust manifold or loose plug ?
Posted 5th Jan 2015 at 18:09
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Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

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Post #8
Thanks guys, could it be the gasket, I recently fitted a decat (which is coming off again...)

Cully your 306oc thread was worth it's weight in gold!
Posted 5th Jan 2015 at 18:14
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Niall

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Location: Epsom

Registered: 06 Jun 2012

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Post #9
This is what a light bottom end knock sounds like!

http://youtu.be/ZHVi1_pwvvw
Posted 5th Jan 2015 at 18:42
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ash j

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Location: Fareham

Registered: 02 Mar 2011

Posts: 415

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Post #10
A blow where the exhaust manifold meets the head can make it sound like a 'tapper'.

Would be worth inspecting, and possibly replacing gaskets and tightening up.
Posted 5th Jan 2015 at 18:44
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bigbadbowen

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Location: Winchester

Registered: 21 Nov 2003

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Post #11
Does it do it from cold ? Or just when its warmed up ?
Posted 5th Jan 2015 at 18:47
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cully

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Location: Cullompton

Registered: 12 Jun 2013

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Post #12
Chr1sch wrote:
Thanks guys, could it be the gasket, I recently fitted a decat (which is coming off again...)

Cully your 306oc thread was worth it's weight in gold!


The crush ring gasket could yes they somtimes take a while to settle once they are fitted correctly Whistle

and im glad my OC thread is of use to some Smile Thumbs up
Posted 5th Jan 2015 at 18:53
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Chr1sch

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Location: Worcester

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Post #13
bigbadbowen wrote:
Does it do it from cold ? Or just when its warmed up ?


Only when good and hot
Posted 5th Jan 2015 at 19:06
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Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

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Post #14
Also, it's always been run and continues to be run on 5w40 fully synthetic, could that be it? Ie too thin when hot?
Posted 5th Jan 2015 at 19:07
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bigbadbowen

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Location: Winchester

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Post #15
Take the brake thingy off the the end of the exhaust cam and see if it stops the rattle ?

I had the same problem but never found the problem

Posted 5th Jan 2015 at 20:11
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Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

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Post #16
Ok I'll give it a try thanks
Posted 5th Jan 2015 at 20:15
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Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

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Post #17
Niall wrote:
This is what a light bottom end knock sounds like!

http://youtu.be/ZHVi1_pwvvw


Not sure the phone picks it up well enough, it's definitley not that kind of metallic knock (I think/hope/pray)
Posted 5th Jan 2015 at 20:16
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ryangti6

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Location: Pontypool

Registered: 01 Sep 2006

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Post #18
Definitely sounds like it's blowing to start with.

Put your head down by the sump and listen to see if the noise is louder. With a bottom end you usually get the nasty rattle just as you take the load off and the revs level, luckily you don't have that so hopefully that's not the problem

________________________________________

Ryan
Posted 5th Jan 2015 at 20:25
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Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

Posts: 1,025

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Post #19
Ok will so, thanks all, bloody hope it is blowing and not anything more serious. That said it doesn't have that lift off rattle of a bottom end or it increasing with revs

Generally it's a pretty noisy old engine, are they all like that?
Posted 5th Jan 2015 at 22:20
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lj_6

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Location: Bristol

Registered: 19 Jan 2010

Posts: 246

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Post #20
They usually tap a bit anyway but it isn't usually that loud. I would definitely check plugs and then try get it on a ramp to inspect the exhaust manifold.

________________________________________

Astra burg #365 Garrett Power
'99 bodied 6 track project
Posted 5th Jan 2015 at 22:22
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Chr1sch

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Location: Worcester

Registered: 02 Aug 2014

Posts: 1,025

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Post #21
Great thanks, will do so ASAP :-)
Posted 6th Jan 2015 at 07:22
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luke89

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Location: Preston

Registered: 28 Aug 2014

Posts: 486

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Post #22
Did you get anywhere with this mate?
Posted 7th Jan 2015 at 19:37
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