Torque and Timing Adjustments
For Portable Aurora Diesel Engines.
* Required torque and timing adjustments necessary for the proper operation of your engine.
Valve Timing
| Model / Item | Phase (Degrees) | |
| Intake Valve Open | BTDC18° | BTDC13° |
| Intake Valve Close | ABDC46° | ABDC52° |
| Exhaust Valve Open | BBDC52° | BBDC57° |
| Exhaust Valve Close | ATDC12° | ATDC8°30′ |
Initial angle of fuel delivery
| Model / Item | 178 | 186 | ||
| Engine RPM | 3000 | 3600 | 3000 | 3600 |
| Initial angle offuel delivery (Degrees) | 19 ± 1 | 20 ± 1 | 21 ± 1 | 22 ± 1 |
Valve Clearance ( measured in millimeters )
| 178 | 186 | |
| Intake Valve | 0.15 – 0.20 (cold) | |
| Exhaust Valve | 0.15 – 0.20 (cold) | |
Torque Specifications for various engine bolts and nuts ( Newton Meters )
| 178 | 186 | Note | |
| Connecting Rod Nut | 25 – 30 | 40 – 45 | Re-tighten up
after initial break in period |
| Cylinder Head Nut | 42 – 46 | 54 – 58 | |
| Flywheel Nut | 100 – 120 | 120 – 140 | |
| Nozzle Retainer Nut | 10 – 12 | ||
| Screw Bolt forRocker Support | 20 – 23 | ||
| Standard M8 Bolts | 10 – 22 | ||
| Standard M6 Bolts | 10 – 12 | ||
Torque is defined as: The measure of the force applied to produce rotational motion. Torque is determined by multiplying the applied force by the distance from the pivot point to the point where the force is applied. The above table is in the Metric System. ( Newton Meters )
