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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Feb-13-2017, 08:49:50 PM   #11
911Fiddler
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Default Re: Horrible engine noise

Cheers for the ideas. I dropped the oil into a clear plastic box and looked thoroughly through it, nothing at all. With damaged shell bearings I'd have expected white metal and or copper in there.....
Clutch eh, interesting, I've never had a clutch fall apart on me.
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Old Mon, Feb-13-2017, 09:24:02 PM   #12
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Default Re: Horrible engine noise

Just shooting out ideas here but if its not vanos or rod bearings, it sounds like there is a pressure leak on one cylinder. Like a header leak or something of that nature. Just really sounds like a pulsing sound more than a metal on metal clank, if that makes sense. I would check all the rocker arms and valves to make sure there is nothing messed up. Could potentially even be a cracked head/ head gasket issue. Have you tried driving the car since the noise? Is it throwing any codes? With the vanos and cams being fine, and clean oil, pinpointing this issue is difficult. These situations are the worst, good luck.
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Old Mon, Feb-13-2017, 10:53:05 PM   #13
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Default Re: Horrible engine noise

Could it be the water pump bearing?

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Old Tue, Feb-14-2017, 12:50:58 AM   #14
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Default Re: Horrible engine noise

You can't see the cam bolts without taking the hubs off, so unless you did that and ommtted mentioning the total tear down of the front end, you shouldn't rule those out. What kind of sound does it make at start up. That's usually a dead give away on the bolts.
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Old Tue, Feb-14-2017, 10:02:31 AM   #15
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Default Re: Horrible engine noise

Quote:
Originally Posted by CLAWHAMM3R View Post
You can't see the cam bolts without taking the hubs off, so unless you did that and ommtted mentioning the total tear down of the front end, you shouldn't rule those out. What kind of sound does it make at start up. That's usually a dead give away on the bolts.
Fair point, those bolts are inside the hub. If they're loose, can this be checked without dismantling? Eg checking for backlash?
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Old Tue, Feb-14-2017, 02:29:24 PM   #16
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Default Re: Horrible engine noise

Quote:
Originally Posted by CLAWHAMM3R View Post
You can't see the cam bolts without taking the hubs off, so unless you did that and ommtted mentioning the total tear down of the front end, you shouldn't rule those out. What kind of sound does it make at start up. That's usually a dead give away on the bolts.
You can visualise the back of the bolt. So you can rotate the engine and visualise the back of the bolts and with a pick you could see if they are loose or if they have backed out. But to definitely cannot see the head of the bolt or out a spanner in them as they are behind the hub.


Last edited by schoonerm3; Tue, Feb-14-2017 at 02:35:33 PM.
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Old Tue, Feb-14-2017, 03:20:14 PM   #17
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Default Re: Horrible engine noise

[QUOTE=schoonerm3;1067591560]You can visualise the back of the bolt. So you can rotate the engine and visualise the back of the bolts and with a pick you could see if they are loose or if they have backed out. But to definitely cannot see the head of the bolt or out a spanner in them as they are behind the hub.

Cheers Ill go check this today.....standby for new news
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Old Wed, Feb-15-2017, 08:07:31 PM   #18
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Default Re: Horrible engine noise

Vanos internal bolts are good.
Top chain guide is not good!
She's not rebuilt as yet so until I've done that and run her I wont be sure this was the fault (might have 2 faults).


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Old Wed, Feb-15-2017, 08:09:08 PM   #19
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Default Re: Horrible engine noise

I hope it was as simple as that!
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Old Wed, Feb-15-2017, 08:52:19 PM   #20
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Default Re: Horrible engine noise

Hope that was it! At your mileage if you haven't done the bearings yet, it's good idea to just do them now anyway.
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Discussing Horrible engine noise in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)