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Servicing guides and mods

54bhp CDI Air Filter Change

Changing the air filter on the 54bhp version of the diesel 451 is unlike the other models.

Modification Details




When the smart fortwo 451 was released with a 54bhp diesel engine it replaced the 45bhp variant.
A different EGR setup was used and a throttle body was fitted which wasn't there on the 45bhp.

Unfortunately, these small additions reduced the amount of space in the engine bay even further.
Space was tight before but in previous diesel model, everything in the way was a soft pipe.
These were easy to remove and get out of the way so the airbox lid could come out.

On the 54bhp model, you had the intercooler and the throttle body in the way, neither were moving.
So, how do you get the air box lid out of the way to change the air filter?



This is the method I discovered when smart redesigned the air intake pipe on the non turbo 451.
Previously it was fairly easy but they redesigned the pipe and the resonator boxes making it hard.

Changing The 54bhp CDI Air Filter

Dave E contacted me asking how it was done. I supplied the knowledge, he supplied the photos in return.

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