Maintenance & Troubleshooting for Portable and Standby Diesel Generators

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 )