Technical modifications: Coolant circuit and engine cooling Engines 601, 602 (except 602.98), 603

Designation

Nature and reason for modification

Production breakpoint

Op. no.

Coolant pump
with drainage pipe

Prevents residue smears
as a result of coolant

01/92

20-210
20-215

Viscous fan coupling with union
nut, engine 601 in model 202

Improved accessability for
removal and installation work

As of start
of production

20-215
20-310
20-312

Coolant expansion tank

With silica gel element
to prevent corrosion

07/92

20-419