The oxygen sensor required for catalyst regulation is screwed into the catalyst housing or into the exhaust pipe at the front, depending on the vehicle model.
The exhaust system of a turbocharged diesel engine has only both rear silencers, there is no pre-silencer.
The front exhaust pipe is connected via a spring-loaded hinge to the exhaust pipe. All parts are bolted together and can be replaced separately. Replace self-locking nuts and seals with new ones after removal. Retaining rings and rubber buffers are checked for porosity and replaced if necessary. When installing a new exhaust system, it is recommended that all mounting parts be updated as well.
The figure shows the exhaust system of vehicles built before 9/93 with engines up to 112 hp. The exhaust system of vehicles manufactured since 10/93 is shown on the next page.
- 1 - sealing gasket
- 2 - outlet pipe
- 3 - self-locking nut, 25 Nm
Only with catalytic converter:
- 4 - fitting, 35 Nm
- 5 - CO sampling tube, 20 Nm
- 6 - cap
- 7 - mechanical seal
Replace only if damaged or leaking.
- 8 - clamping spring
- 9 - clamping sleeve
- 10 - designation «S»
In the presence of an automatic transmission, the designation «A».
- 11 - bolts
Tightening torques: M6 thread - 5 Nm: M8 thread - 25 Nm: M10 thread - 40 Nm.
- 12 - size «A» - 5 mm
- 13 - designation
- 14 - protective screen
- 15 - front exhaust pipe
On vehicles without a catalytic converter, the front exhaust pipe has been extended to the pre-muffler.
- 16 - sealing ring
- 17 - self-locking nut, 15 Nm
- 18 - catalyst
- 19 - intermediate pipe
- 20 - suspension
- 21 - middle muffler
- 22 - subsequent muffler
- 23 - console
Vehicles manufactured since 10/93 (except for those with a VR6 engine and all-wheel drive)
- 1 - front exhaust pipe
- 2 - bolt, 40 Nm
- 3 - double clamp
- 4 - intermediate pipe
- 5 - clamp type «terminal»
- 6 - console
- 7 - suspension
- 8 - bolt, 25 Nm
- 9 - subsequent muffler
- 10 - designation
For clamps «terminal», 3 dents around the circumference.
- 11 - place of separation
For repair, disconnect the exhaust pipe at a right angle. The middle and subsequent mufflers are supplied separately, with a connecting pipe and two clamps of the type «terminal».
- 12 - place of separation
- 13 - size «b» - about 10 mm
- 14 - size «A» - about 5 mm
- 15 - designation
- 16 - designation «S»
In the presence of an automatic transmission, the designation «A».
- 17 - repair connecting pipe
- 18 - middle muffler
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