W210 E270 cdi abnormal sound. Video

xxvoicexx

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Video included. Listen to the sound of non rhythm heavy ticking sound.. I worried it's the timing chain sound.
Can anyone enlighten me what sound is this?

https://streamable.com/9q01j
https://streamable.com/7ne1s
https://streamable.com/tibb3


I had drove 300km when I 1st discover the sound.. The sound is less when engine isn't fully warmed up. When fully warm the sound is more loud.. Can the chain snap and destroy the engine if I ignore it?
 

alexanderfoti

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Run the engine without the belt and see if the noise is still there.

If it is, possibly vac pump, hard to tell.
 
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xxvoicexx

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Run the engine without the belt and see if the noise is still there.

If it is, possibly vac pump, hard to tell.
The vac pump can be rebuild? How much it cost to rebuild/purchase new ones.

Is it common to have vac pump failed? How long can I rely on this car now? Can it be stranded half way?

The sound is more noticeable in the last video when the engine is fully warmed.
 

alexanderfoti

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The vac pump can be rebuild? How much it cost to rebuild/purchase new ones.

Is it common to have vac pump failed? How long can I rely on this car now? Can it be stranded half way?

The sound is more noticeable in the last video when the engine is fully warmed.

Yes but not easily. Easier to buy Reman.

The answer to all your other questions are a guess..... Keep in mind vac pump is also a guess from a 30 second phone video....
 

LostKiwi

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'93 500SL-32, '01 W210 Estate E240 (RIP), 02 R230 SL500, 04 Smart Roadster Coupe, 11 R350CDi
Get a long screwdriver and carefully put one end on the component you suspect makes the noise and the other against your ear. Remember there are rotating components there so take great care not to trap clothing, hair, screwdriver, limbs etc in any moving parts or belts.
I find putting the handle end of the screwdriver against the ear works best ;)
 

RUBBER_UNDIES

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2003 w211 E270 177 BHP
Could be wrong but it sounds like belt slap to me. I wouldn't it's your timing chain. Does it rattle when on first start up for a couple of seconds?
 
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xxvoicexx

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The sound has fully gone, I suspect it was the radiator fan carbon bush spinning sound

Or 2nd possible is the alternator clutch pulley as now I had found it's seized /became fixed pulley , no more one direction rotation
 

D5meister

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The final vid sounds like the belt tensioner. You can hear a whistle like belt slip in all of them.
 

D5meister

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You can get these mechanical stethescopes for under fiver on the bay.
 

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