Mercedes-Benz 603 Service Manual page 226

Caution!
The ring gear is hardened. For this reason do
not exceed 220 " C at any point while heating
with hot plate or heating furnace.
Use temperature measuring chalk in accordance
with directions.
Use open flame only In exceptional cases. Apply
flame to inside of ring gear only.
After replacing ring gear, it is not necessary to
balance the flywheel.
03 10 - 43012
EXIT