Can these engines be swapped?

Question

Could a Peugeot 306 1905cc turbo diesel engine be used to replace the 1769cc turbo diesel engine in my Peugeot 205? If it is possible, how difficult a job is it to do?

Answer 1

Dimensionally it should fit.

However, the 1905cc turbo diesel had an iron block, whereas the 1769cc units (and the 1905cc non-turbo) had aluminium alloy blocks.
Therefore the mass (weight) of the 1905cc turbo engine may be a problem. You may need to use different engine mounts and reinforce the engine-mounting points on the body structure. You will definitely have to find suitable replacement springs and dampers to cope with the extra mass.