Replacing Thermostat on W212 350CDI

[DaveE320CDI]

Hi, As anybody changed a Engine Thermostat on a W212 350 CDI? This is a job i have to do and first attempt seems a bit awkward, got it all apart bar the last bolt under the charge pipe and it is so long that you cannot get it out because of the high pressure fuel pipe is in the way! so for the time being have put it all back together again, any tricks or thoughts appreciated, cheers Dave

 

[Oldspanners]

Hi, As anybody changed a Engine Thermostat on a W212 350 CDI? This is a job i have to do and first attempt seems a bit awkward, got it all apart bar the last bolt under the charge pipe and it is so long that you cannot get it out because of the high pressure fuel pipe is in the way! so for the time being have put it all back together again, any tricks or thoughts appreciated, cheers Dave

It's in German but it's a Mercedes after all.

 

[onefortheroad]

this blokes a clown , he broke the first connector getting it off - ha ha ... if you syphon the header tank , you dont lose any coolant , or park on a bank and do it .

 

[DaveE320CDI]

Thanks for that Oldspanners, Agree with Onefortheroad in that the bloke is a bit hamfisted i think, would not like him working on my car! cheers Dave

 

[tonyleckenby]

did mine today, also broke the lock on the connector(brittle plastic) but it's a tight fit so I recon it will be okay! great tip about syphoning the header tank, got 2 ltrs out and not a drip from the hose or housing when removed! pleased to say on my engine the long bolt comes out without having to remove any pipes/ducts for access. Job done in less than 30 mins.

 

[mioba]

welcome to the forum and glad you got it done.

Was there any tricks which may help others searching the forum.

 

[tonyleckenby]

no all straight forward, just the tip about emptying the header tank.

 

[Pikapika25]

Did you have use a flexible extension or anything to get under the pipe for the turbo to reach the awkward bolt?

 

[onefortheroad]

Did you have use a flexible extension or anything to get under the pipe for the turbo to reach the awkward bolt?

Try a spanner

 

[Pikapika25]

Is that after having to take the turbo intake pipe off (a trying to avoid upsetting the seal if that is taken off)

 

[onefortheroad]

Is that after having to take the turbo intake pipe off (a trying to avoid upsetting the seal if that is taken off)

Have a garage do it ,if you think it's a bridge to far . The video above shows him removing the turbo air pipe . It's obviously in the way of removal of the thermostat. Just getting that pipe off is a job in itself , trust me !!!

 

[tonyleckenby]

No the charge pipe on mine was a smooth pipe without all the blanked off branches on it! socket with long extension fitted straight on bolt, next time I am under bonnet I'll take a pick and post it here.

 

[onefortheroad]

No the charge pipe on mine was a smooth pipe without all the blanked off branches on it! socket with long extension fitted straight on bolt, next time I am under bonnet I'll take a pick and post it here.

That was the best pipe , you can't do buggar all with this new pipe , fuel filter isnt accessable anymore , pita . And mb say its to reduce turbo noise by 4% , bollox . !!!!

 

[rifiki]

I just love modern-ish cars
Decades ago to change a thermostat, 2 bolts, hose clip and £5 for the part. job done.

 

[grayb]

That was the best pipe , you can't do buggar all with this new pipe , fuel filter isnt accessable anymore , pita . And mb say its to reduce turbo noise by 4% , bollox . !!!!

I have never ever been aware of turbo noise in our car... (even after it had been to Burnham-on-Crouch).

 

[onefortheroad]

I have never ever been aware of turbo noise in our car... (even after it had been to Burnham-on-Crouch).

Exactly.

 

[JBell]

Just had mine done by my Indy, not a fun job as has been said one bolt is very long and the charge pipe get's in the way.

I put a Febi Bilstein thermostat in, was 1/3 of the price of a OEM MB one

 

[Pikapika25]

this blokes a clown , he broke the first connector getting it off - ha ha ... if you syphon the header tank , you dont lose any coolant , or park on a bank and do it .

Park on a bank - ie to have the front of the car raised slightly?

 

[onefortheroad]

Park on a bank - ie to have the front of the car raised slightly?

Yes . No coolant is lost.

 

[tonyleckenby]

plain pipe for those that haven't seen what we are talking about