7.12.7 Exhaust flaps – Checking coupling rods operability and play
Preconditions
☑Engine is stopped and starting disabled.
☑Operating voltage is not applied.
WARNING
Exhaust flaps / air flaps close rapidly.
Risk of crushing!
• Using a suitable tool, check exhaust flaps / air flaps by pressing the actuating linkage to its limit
several times and releasing it.
WARNING
Component is hot.
Risk of burns!
• Wear protective goggles.
Checking coupling rods (bypass and EGR flap) – mechanically
Note: For installation position of exhaust flaps, refer to overview (→ Page 144).
1. Remove guard plates of exhaust flaps.
2. Check operability and ease of movement of
coupling rod (1) by moving it at the speci-
fied points (arrows) and make sure that
there is no excessive play.
Result: Replace coupling rod (1) if it is jamming,
sluggish or features excessive play
(→ Page 149).
3. Check whether the internal spring pulls the
flap into the F-position:
• Fail-safe position for bypass flap and
EGR shutoff flap: opened.
• Fail-safe position for donor cylinder flap:
closed.
Result: If the bypass flap/EGR shutoff flap is
closed or the donor cylinder flap is open,
contact Service.
Checking coupling rod (donor cylinder flap) – mechanically
Note: For installation position of exhaust flaps, refer to overview (→ Page 144).
1. Remove guard plates of exhaust flaps.
MS150112/01E 2014-10
| Task Description | 147
TIM-ID: 0000044535 - 002
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