Body: W124
Year: 1987
Engine: Diesel (says 2.5 Turbo on the trunk lid) L6

The problem: When I brake, though sometimes even sitting still but
especially when braking, I hear a loud clanking under the hood.
Sounds like the fan blade hitting something. The car has a
replacement Nissen radiator. I cannot see any damage to the radiator
but two blades show edge wear.

What would you check?
I can't find any looseness in the fan clutch.
Maybe engine mounts?
I'm in a quandry. Just replaced the radiator and don't want to have
to do it again.
The previous radiator was the same Nissen replacement model. They
appear thicker than the original Behr, but unfortunately I don't have
the original to compare. Can anyone provide me the thickness of their
radiator?

Again, I am in a quandry on this one and don't want to drive the car
until it is fixed correctly.