Removal and installation of turbocharger of MPI and MPFI injection system (Audi 100 C4)

As is known, the engine after a long trip at high speed should not be turned off immediately, but allowed to idle for a while. The reason for this is as follows: if you immediately turn off an "overheated" engine, the turbocharger hall bearing will heat up so much that the oil for lubricating the bearing may burn out. With such treatment and repeated start-up, the turbocharger will soon fail.

The turbocharger is quite sensitive to dirt or foreign objects, so cleanliness must be maintained during removal and installation.

Disconnect the ground wire from the battery (don't forget about the radio receiver encoding).

Remove the air filter.

Disconnect the air hose from the turbocharger.

Clamp the coolant hose going to the turbocharger with a clamp or drain the coolant.

Raise and support the front of the vehicle on stands.

Disconnect the exhaust system mount from the gearbox.

Disconnect the catalytic converter from the turbocharger (4 nuts).

Disconnect the oil inlet and outlet pipes from the turbocharger. Make sure that as little oil as possible flows out.

From the bottom, unscrew the bolts that secure the turbocharger to the exhaust manifold. These bolts are not easy to access, so you will need to use a suitable wrench (12mm open-end wrench). While doing this, hold the turbocharger and when all the bolts are removed, pull it up.

Installation is carried out in the reverse order of removal. Always use new nuts and bolts. Before connecting the oil supply pipe, pour a little oil into the turbocharger (pre-lubrication). At first, do not let the engine run at high speed.

(Content source: the specified website «audimanual»)