horrendous noise.

[teddybear581]

My 2013 SLK55 AMG V8 suddenly developed a dreadful noise. Only when hot. no smoke, no oil leaks no problems with driving. I obviously don't want to drive until I know what it is. Any suggestions while waiting for the dealer to get back to me. Caught the noise on my ring doorbell which is attached as a zip file.

 

[mioba]

No idea. but if your car was last serviced at MB you will have mobilo. give them a call

 

[DREAMER NO2]

Thanks Ted i am now stuck with this ****** RING VIDEO ..

 

[00slk]

Sounds like an idler bearing or the supercharger bearing?

 

[SL63 Mark]

Sounds like an idler bearing or the supercharger bearing?

I don't the SLK '55 has a supercharger, you need a SL55 for that.

Could be wrong (and often am).

 

[teddybear581]

The SLK55 is normally aspirated so no supercharger. The garage say it a diaphragm in the oil separator pump.

 

[Blobcat]

Sounds like an idler bearing or the supercharger bearing?

I don't the SLK '55 has a supercharger, you need a SL55 for that.

Could be wrong (and often am).

The SLK55 (R172) has a relatively rare M152 engine - V8 normally aspirated of 5.5 ltr capacity - only used from 2012-2016

It is derived from the M157 (5.5ltr twin turbo) which is derived from the M278 engine which is 4.7 ltr capacity and twin turbo charged

 

[00slk]

I don't the SLK '55 has a supercharger, you need a SL55 for that.

Could be wrong (and often am).

The SLK55 is normally aspirated so no supercharger. The garage say it a diaphragm in the oil separator pump.

Yep, I am wrong again

 

[DREAMER NO2]

Well 00slk i am glad i am not the only one that gets things wrong now and then . Wife said i am always wrong /

 

[SL63 Mark]

Yep, I am wrong again

Shame really, the SLK would have been pretty quick with the kompressor engine.

Back on topic, the noise sounds like ancillary belt pulleys bearings/alternator, water pump, power steering etc. etc. Does it sound like it's coming from the front of the engine ?

 

[teddybear581]

It does sound like its comming from the front but its difficult to pin down exactly where.

 

[Brian23]

Get a Mechanic's Stethoscope. They are great for this and not normally expensive. Often available at local parts Specialist, Halfords etc.

 

[00slk]

Shame really, the SLK would have been pretty quick with the kompressor engine.

Back on topic, the noise sounds like ancillary belt pulleys bearings/alternator, water pump, power steering etc. etc. Does it sound like it's coming from the front of the engine ?

So would have the R170 with a 5.5 supercharged SL engine

 

[RhodieBill]

Sounds like a Pulley Bearing to me.....

 

[LostKiwi]

Take off the serpentine belt and briefly spin up the engine.
If no noise spin each bearing by hand. If one is gritty or anything other than smooth feeling you have your answer.

 

[LostKiwi]

Get a Mechanic's Stethoscope. They are great for this and not normally expensive. Often available at local parts Specialist, Halfords etc.

View attachment 72965

Or just use a long screwdriver against the ear.