Sequence of work
1. Jack up the car securely.
Pic. 4.102. crankcase mount (big arrow) and gearbox housing (small arrows)
2. Remove the bottom cover of the engine and gearbox (pic. 4.102).
3. Disconnect the front section from the flange.
4. Remove the fasteners of the front section (two nuts).
5. Remove the system from the suspension. Here you will need an assistant to support.
6. Carefully remove the muffler so as not to damage the catalyst.
7. Before installation, clean the muffler connections from plaque and soot.
8. Clean the threaded connections with a wire brush and lubricate with special oil.
9. If the system has been dismantled completely, first connect all its parts without tightening the connections firmly.
10. Secure the system to the hangers before tightening all fasteners. Check that the distance from the exhaust system to other parts of the vehicle is at least 25 mm.
11. Tighten all bolts with a force of 20 Nm.
12. Take a test drive. The exhaust system must not hit when the vehicle is moving. Rumble and rumble indicate constriction of the connections.
Pic. 4.103. Clamp between the front and rear of the muffler
13. After mounting the system under the bottom of the car, tighten the clamp between the front and rear of the muffler (pic. 4.103).
Pic. 4.104. Fastening the front part of the muffler on the gearbox
14. Mounting the front of the muffler on the gearbox can be used after removing the cover to orient the exhaust system (pic. 4.104). To do this, unscrew both screws (big arrows) and move the mount accordingly. muffler bolts (small arrows) tighten after alignment.
Pic. 4.105. Flange bolts on the exhaust manifold
15. After leveling the entire system, you can tighten the bolts (pic. 4.105) flanges (arrows, only two are visible) on the exhaust manifold.
16. Then loosen the clamps again (be careful on hot pipes) and align the system again.
Attention! Catalyst disposal
Attention! Spent catalysts contain precious metals that can be recovered. Mercedes-Benz service departments accept used catalysts in exchange for new ones at a surcharge. Do not open the casing of the catalyst - it contains highly toxic substances.