Distributor 4 cylinder engines
Distributor Bosch of the TT or TTS. Only centrifugal advance mechanism (no vacuum advance). White arrow shows the rotation direction.
Maintenance distributor
Check distributor cap every 5.000 km inside. Remove oil and dust. Refresh and polish the rotor arm point and central contact point. Clean the 4 distributor cap contact points and examine the cap for signs of tracking dirt and hairline cracks. Examine the situation of the carbon brush and spring in the centre of the cap.
The cam faces should be smeared with high melting point grease for the cam and use grease on the pivot of the moving contact breaker and clean off any excess grease.
Vacuum advance
Depending of the vacuum or pressure in the vacuum retard unit the ignition timing is earlier or later. Measure the advance after the vacuum tube is disconnected and closed. Centrifugal advance mechanism. The mechanism starts after 1000 rpm.
| Distributor types NSU 4-cylinder engine | ||
| NSU number | Bosch number | Car model |
| 0 231 146 031 - JFUR 4 - steel | NSU 1000 / 1200 | |
| 068 17 01 513 000 | 0 231 115 049 | NSU Prinz 1000 |
| 074 17 01 501 000 | 0 231 146 042 - JFUR 4 - steel | NSU 1000 / 110 / 1000TT |
| 068 17 01 524 000 | 0 231 129 028 | 1e type TTS |
| 068 17 02 524 000 | 0 231 129 029 - JFR 4 - steel | TT / TTS |
| 068 17 03 524 000 | 0 231 178 001 | TT / TTS |
| 778 17 00 301 000 | 0 231 040 394 | race distributor TT / TTS |
| ZV 2/90 C 14 | TTS | |
| ZV 2/90 C 15 | race distributor TT / TTS | |
| 768 17 03 902 000 | 0 231 170 001 - JFU 4 - alu | 1000 / 1200 |
| 768 17 03 901 000 | 0 231 146 069 - JFUR 4 - alu | 1000 / 1200 |
| 768 17 04 401 000 | 0 231 115 075 | 1200 for USA |
| Adjustments | NSU 1000 / 1200 JFUR 4 |
NSU 1000C / 1200C ZV 2/70 N3 |
NSU TT JFR 4 |
NSU TTS ZV 2/90 C 14 |
| Static timing | 4° before TDC | 4° before TDC | 3° before TDC | 0° before TDC |
| Gap | 0,40-0,45 mm | 0,40-0,45 mm | 0,40-0,45 mm | 0,40-0,45 mm |
| Contact pressure | 400-530 gram | 400-530 gram | 500-630 gram | 500-630 gram |
| Rotor shaft diameter | 13 mm | 12 mm M3,5 | ||
| Dwell angle degrees crankshaft |
47-53 degrees | 47-55 degrees | 59-65 degrees | 59-65 degrees |
| Capacitor | 0,23-0,32 µF | 0,23-0,32 µF | 0,23-0,32 µF | 0,23-0,32 µF |
| Vacuum advance bereik | 14-20 degrees | 19-25 degrees | ||
| Vacuum starts | 70-115mmHG | 115-165mmHG | ||
| Vacuum ends | 290mmHG | 280-400mmHG | ||
| Advance in degrees crankshaft |
1000 rpm= 5-10 graden |
1000 rpm= 1-9 graden |
1000 rpm= 3-6 graden |
1000 rpm= 0-3 graden |
| 1500 rpm= 7-12 degrees |
1500 rpm= 12-19 degrees |
1500 rpm= 8-12 degrees |
1500 rpm= 5-9 degrees |
|
| 2000 rpm= 17-22 degrees |
2000 rpm= 16-21 degrees |
2000 rpm= 14-18 degrees |
2000 rpm= 11-15 degrees | |
| 3000 rpm= 28-34 degrees |
3000 rpm= 22-27 degrees |
2500 rpm= 19-23 degrees |
2500 rpm= 16-20 degrees | |
| 3600 rpm= 35-40 degrees |
4000 rpm= 28-33 degrees |
3000 rpm= 25-29 degrees |
3000 rpm= 22-26 degrees | |
| 5000 rpm= 33-38 degrees |
3100 rpm= 26-31 degrees |
3100 rpm= 23-27 degrees |