dan ennis
Active Member
- Joined
- Nov 22, 2017
- Messages
- 26
- Reaction score
- 11
- Your Mercedes
- w204 250cgi
Hi all
My first post as a Mercedes owner. I am after peoples opinions of the state of my timing chain/gears on my m271 evo, I will explain further when a few opinions come in as to why I ask! The chain has a fair bit of movement in it on the right hand side and it is noisy when running.
Thanks
View attachment 40610 View attachment 40611 View attachment 40613
So this is the story. I had a company who specialise in manufacturing replacement chains and sprockets (used by quite a few people on the forums) carry out the job of supplying the parts and carrying out the diagnosis and repair. The mechanic initially "replaced" the chain, sprockets and tensioner and after doing so said that there was another issue with the engine and it was making a clicking sound on turning the engine by hand and he was reluctant to start it. This service was carried out at my home address and he gave up when it got dark and said he would be prepared to return and diagnose the issue further.
After chasing the mechanic and owner of the company for two weeks he came back and within an hour, delivered the bad news that the big end was gone!! I had to go to the hospital and whilst out, he had got my girlfriend to start the car up and it had apparently run ok for a minute and then made a nasty sound. So after the bad news, he left us with an apparently knackered car.
I thought this a bit odd, even more so when the owner of the company rang a few hours later offering to buy the car from me (£3k under value) as he felt bad for me. So today I took a chance and drove it round to my regular mechanic who is 2 minutes away from my house. The car made it there fine and was just a little louder than normal, no big end noises. We put a stethoscope on the engine and the bottom end is quiet as a mouse, the only noise (the loud rattling noise) is coming from the timing chain. As you can see, this all seems a bit fishy.
Interesting, so this video is of the supposedly finished job! It seems really odd the lengths they have gone to not to accept any liability. The mechanic said the same, very little wear on the sprockets. Out of interest, do you always replace with MB genuine sprockets?I replaced a chain on that model today, only 70k miles and took that exact same video for customer. No noticeable wear on sprockets, (compared them to new ones).
How to you re-manufacture a sprocket without reducing it's diameter or welding every tooth?Some of these gears are not remanufactured correctly and can rattle badly.
How to you re-manufacture a sprocket without reducing it's diameter or welding every tooth?
So do you think it is more a chain issue on this model than the sprockets? Apparently the chain should be new, i'm not convinced obviously. So far I am £1000 out of pocket and currently have a hire car so i'm not happy! I will try and pm the supplier to you, i'm sure you will know who they are.Yes on this model, expensive but then we don’t get any problems. They are just coming they on mb exchange program. So cheaper. Finished job??? Surely that’s the old chain and slipper guides.
After we replaced the chain only, it didn’t ride off the sprockets, customer was advised about sprockets but it would add close to £1000 to the job.
So do you think it is more a chain issue on this model than the sprockets? Apparently the chain should be new, i'm not convinced obviously. So far I am £1000 out of pocket and currently have a hire car so i'm not happy! I will try and pm the supplier to you, i'm sure you will know who they are.
I think you are right!Those sprockets are not new. I've just enlarged one of the images and there is a clear wear step on the inlet cam. Immediately above 'ein' on the far side of the teeth, the wear line can be clearly seen.
I think you've been done mate.
Understood, thank you. Mine looked like sintered steel but the OP's was flame hardened steel, not much you can do with a flame hardened piece once it's been 'cooked'!!I think they make new gears and re use the internals. We only use mb sprockets for the later type chain, the earlier 271 engine, we offer the choice due to the value of the car and cost of oe parts but have learnt to inspect for correct assembly.
The best I could do I'm afraid. But the wear step can be seen clearly. View attachment 40616