W203 270 Cdi Engine Knock

[Wee T]

I have searched and read a lot of threads but can't seem to find my problem.I have a 2002 C270 Cdi estate.It has covered a genuine 81k miles.Yesterday whilst towing a car on a transporter around 1800kgs all in my engine started to knock.it sounds like it's coming from the top end but I can't quite pin point it.It sounds heavier than the usual sticky tappet on a small engined petrol car wich i'm well used to working on.Oil level is ok according to the dash but I added 1/2 a litre to see if it made any difference but it hasn't.Anyone got any ideas ? I hope it's not an expensive one to repair.

 

[BlackC55]

Could it be an injector knock?

 

[AndyPCD]

Second that. A quick star test may shed some light on it

 

[Wee T]

Star Test

Thanks for the quick replies i'll search for the Star test to see how it's done..

Second that. A quick star test may shed some light on it

 

[AndyPCD]

A star test is done on the diagnostic computer used in the mercedes dealers

 

[Wee T]

MB Dealers

Thats not so good i'll ring them for a quote.Thanks

A star test is done on the diagnostic computer used in the mercedes dealers

 

[x332race]

Sorry, but if you towing 1,800kgs with a C270 then you are over the manufacturer's max permissible towing weight limit of 1,500kgs......you could get into trouble because of that

 

[Wee T]

Trouble

Yeah i'm pushing it a bit but i'm always careful when towing and stick to 50mph.My transporter is under a year old and has excellent brakes.The Police around here don't bother you when your towing providing your being sensible and the set up looks safe.

Sorry, but if you towing 1,800kgs with a C270 then you are over the manufacturer's max permissible towing weight limit of 1,500kgs......you could get into trouble because of that