Engine Rattle

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
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slimmyreed
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Engine Rattle

Post by slimmyreed » Thu Oct 22, 2009 11:41 pm

Hi Guys,

My car seems to have recently developed an engine rattle when starting from cold. It is only for a second after starting, but it isn't somthing i have noticed before.

It reminds me of the noise a car that has been sat for a long time makes when it is started, as there is not a drop of oil in the head.

Anyone elses car rattle on a cold start?

I also just had my cambelt changed at MRC, possibly related?

I have done a search of the forum, and i have seen that this has been talked about before, but not for a while, and with no definitive answer. Any developments on this subject?

Cheers

Simon

P.S. My oil level is fine (first thing i checked)

MartWilliams
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RE: Engine Rattle

Post by MartWilliams » Fri Oct 23, 2009 12:34 am

hydraulic lifters being noisy while the oil pressure builds up? If it's that then it is probably normal

philroach
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RE: Engine Rattle

Post by philroach » Fri Oct 23, 2009 7:54 am

sounds normal to me , especially now it is colder . Should only last a second or two until oil recirculates
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Daveperc
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RE: Engine Rattle

Post by Daveperc » Fri Oct 23, 2009 9:15 am

Hi there - all normal - postings will resume when the cold weather gets here!!

Dave

slimmyreed
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Post by slimmyreed » Fri Oct 23, 2009 8:43 pm

cool! :thumb:

mtech114
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Post by mtech114 » Fri Oct 23, 2009 10:57 pm

Hi, the rattle you hear is the camshaft timing chain tensioners. With age the oil seals perish in the tensioners causing oil holding pressure to drop overnight, as the engine is started it takes a moment for oil pressure to build up in the tensioners to tension the timing chain correctly, causing the chain to rattle. Simples

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Shoppinit
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Post by Shoppinit » Sat Oct 24, 2009 8:36 pm

What timing chain?
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Post by raceman » Sat Oct 24, 2009 9:26 pm

the ones at the back of the engine?
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ecain63
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Post by ecain63 » Sat Oct 24, 2009 10:13 pm

Timing chain? I thought it was belt!
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pete2144
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Post by pete2144 » Sat Oct 24, 2009 10:49 pm

ecain63 wrote:Timing chain? I thought it was belt!
There are chains inside the rocker covers to keep the cams in time....

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Post by gorwanvfr » Sun Oct 25, 2009 7:54 pm

Chains
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Chains.jpg

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kbee
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oil preesure

Post by kbee » Mon Oct 26, 2009 12:37 pm

Correction , its a known fault by audi,theres a pressure relief valve in between the banks, this fails allowing all pressure to be released overnight,bitch to change ive lived with mine since purchase , still offputting.

Balchy
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RE: oil preesure

Post by Balchy » Mon Oct 26, 2009 1:28 pm

if it's any consolation, M5 V8 engines I've heard starting up from cold sound a lot worse than mine ...

TIMSRS
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RE: oil preesure

Post by TIMSRS » Fri Oct 30, 2009 10:03 pm

Yep, you are right they have chains just under the rocker covers.
If the tensioners go weak the chain will catch on the rocker cover itself.

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