300CD (123.153) L5-3.0L DSL Turbo (617.952) (1982)
Flywheel Gear: Service and Repair
Data
Lateral runout on ring gear
max. 0.4
Centering flange dia. for
268.31-268.39
ring gear
Shrink-on temperature
220 °C
Annealing color
yellow
Conventional accessory
Temperature measuring chalk
e.g. from AW Faber-Castell
D-8504 Stein bei Nurnberg
color no.2815/220 (white) Thermochrom
NOTE: The ring gear is hardened. To protect hardness, the temperature for hardening ring gear should not exceed 220 °C at any point. This can be
done reliably only by means of a hot plate or a heating oven.
An open flame may be used as an exception only. The flame should touch only the inside of the ring gear.
Following renewal of a ring gear, the flywheel need not be balanced.
Renewal
1 Center drill old ring gear and break up with a chisel or heat quickly and immediately remove.
2 Clean mounting surface of ring gear on flywheel.
3 Uniformly heat new ring gear on a hot plate or in a heating oven.
For this purpose, use temperature measuring chalk in accordance with instructions whenever possible.
4
Mount heated ring gear immediately on flywheel.
Attention!
The tooth chamfer (arrow) should face starter motor.