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B Class Ctv gearbox

Kerabo

Active Member
Joined
May 20, 2018
Messages
467
Location
Spalding Lincs
Car
2006 C220 Estate
I had been looking at the B Class range and found a nice car but with a noisy bearing in the gearbox and it seems it don't move because if this. A little recearch show that a bad Cvt box just about writes off the car.
Would it be possible to fit a gearbox and change system from another B Class? Either manual or a normal auto box. What would be needed eg flywheel any ECU, drive shafts? Would it need programming if it had another box or is it just too much work to even think about this?

Thanks Ken
 
Ken

Welcome

The CVT gearbox does seem to cause some problems in this model. I doubt very much if a noisy bearing would stop the gearbox operating but a bearing breaking up may do so.

Changing it to a manual is of course possible but pointless, the engine and gearbox ECU's work together so you would need to change these or possibly re-program the main engine ECU, add a flywheel, clutch, clutch pedal, clutch hydraulics or cable etc. You could not fit a conventional torque convertor style gearbox without many major modifications probably costing far more than the value of the car.

In terms of exchanging the broken gearbox; unless you can get a guaranteed replacement gearbox and the car is very cheap then there is always the risk of it failing.

Move on, there are plenty of cars out there without problems.
 
Thank you for you clear reply.
It's more or less as I expectpted with the car having its systems built around this. Until I found the add for this car I wasn't aware Mercedes had a Cvt vehicle.
Just out of interest is the B Class like the old A Class with everything tucked into a space underneath the floor making it difficult for home repair or are they conventional?

Thanks again Ken
 
IRRC there are also problems with drive shafts / CV joints? which is a separate issue from the CVT box itself which may be OK.
Usually its unwise to change from a car's original build spec, which altho it may be well engineered it may make selling it on difficult. Best to repair the existing technology. The W 245 had the same sandwich floor and limited engine and gear box accessibility as the W169 A class meaning major repairs are usually an engine transmission out job altho some jobs acan be done in situ by dropping the assembly slightly.
CVT rebuild
 
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Thank you all for the replies
Best stay away from this idea.

Regards Ken
 
As a B Class owner, I'll try and redirect you back to the B Class :D My car has now covered just short of 118k miles and I have had one CV joint replaced as a result of the gaiter parting company through age and dirt getting into the joint. I've owned the car for 8 years and would recommend it, but cars are cars and the next one, whatever make could be a dog. One thing to check, make sure the gear box oil has been changed every 40k miles and the service history is good. The only other part to replace was the air conditioning condenser, it's at the lowest part of the engine bay and gets all the mess thrown up. The part is relatively cheap, but a bit difficult to fit as the front end of the car needs to be removed, well front bumper, intercooler pipe and a few other bits, about 2-3 hours work.
 

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