2. Continue turning the engine clockwise until the TDC marks line up on the crankshaft pulley and the lower drive cover (photo). On a 20 valve engine (7A), you will need to align the label "0" on the flywheel with a corresponding mark in the hole in the gearbox housing, since there is no mark on the pulley. This procedure can be used for all other engines.
3. For additional control, you can remove the top cover of the drive. The TDC mark on the camshaft sprocket must be aligned with the pointer on a 20-valve engine, or the top edge of the cylinder head on other engines (see section 1).
4. Mark the exact alignment of the distributor housing and the engine block or cylinder head relative to each other.
5. Disconnect the vacuum pipe from the vacuum chamber (photo).
6. Squeeze the spring clip, disconnect the wire contact (photo).
7. Remove the screen (if available), then remove the brackets and lift the cover off the distributor (photo).
8. Check if there is a mark on the top frame of the distributor housing that matches the center of the distributor runner. If not, make a mark with a pencil (photo). On a 20-valve engine, a special Audi tool is used to align the distributor runner, shown in fig. 4.21. If necessary, a similar tool can be made from an old breaker-distributor cover.
9. Unscrew the clamping bolt or nut, remove the clamp (photo). A plug can be installed on the bolt.
10. Remove the distributor from the block or cylinder head (photo).
11. Check the condition of the rubber O-ring on the base of the distributor, if necessary, remove and replace it (photo). If present, also replace the gasket.
12. Check that the crankshaft remains at TDC.
13. Turn the distributor slider slightly clockwise from the TDC position, then position the distributor in the hole in the block or head, aligning the previously made marks on the body and block or head.
14. Lower the distributor into place, check that the distributor slider has moved counterclockwise to its original position. On a 4-cylinder engine, if the distributor does not install completely, remove the block and slightly turn the oil pump drive shaft with a screwdriver, then try again (photo).
15. Check that the pre-marked marks are aligned, then install the clamp and tighten the bolt or nut.
16. Install the cover of the breaker-distributor, wiring and vacuum pipe. If removed, also install the drive cover.
17. Check and, if necessary, adjust the ignition timing as described in Chapters 13, 14 or 15.
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