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http://www.ultralightnews.ca/hirth-engines.htm Page 18 of 31
The Ultralight News
5.2Running in - Recommendation
Göbler-Hirthmotoren KG does not give explicit instructions for running in its engines, since the
nickel-silicium coating of the cylinder and the aluminium pistons do not have to wear to each other. The
engines are ready for full throttle from the time they are built if the maximum temperatures of the cylinder
head and exhaust gases mentioned earlier are not exceeded.
However, it would be wise when the engine is first started, to run the motor at half throttle and load (not over
4000 rpm) for the first hour of operation. Please note, the engine has been initially run at the factory to set the
electronic timing so it is possible when the engine is first started, there may be more smoke than usual. This
is generally due to excess oil possibly still in the engine during assembly and will reduce to normal after the
engine has been running for a couple of minutes.
5.3Initial Inspection
After the first 10 - 15 hours in operation or after a large service the following service tasks should be carried
out:
-Tighten the engine fitting screws as a safety measure
-Re-torque the cylinder head screws as a safety measure
-Tighten the sparkplugs as a safety measure
-Visual check (leakage, loose nuts/screws etc.)
Note:
It is recommended that the following inspection be carried out for safety reasons before each use of the
engine:
Starter (check connections, fitting and condition)
Carburettors (check connections, fixtures and condition)
Ignition system (check connections, fitting and condition)
Air cooling system (check fitting and condition; check fan belts for condition and tension)
Cylinder head (check connections, fitting and condition)
Cylinders (check fixtures and condition)
Exhaust gas manifold (check fitting and condition)
Exhaust system (check fixtures and condition)
Sparkplugs and sparkplug leads (check fitting and condition)
Fuel system (check for leakage and dirty filter)
5.4Starting Procedure
Secure the fuel supply (fill the tank, open the fuel cock,...)
If the engine is cold, engage the choke(s).If the engine is warm or hot do not engage the choke.
Move the throttle lever into a fast idle position.
Switch on the ignition system (ON-Position of the ignition switch)
Start the engine (Activate starter maximum 10 seconds)
When the engine has started, reduce the choke slowly to the off position and apply a small amount
of throttle.
Allow the engine to warm up at a ¼ load or 3000 rpm for about 3 minutes.
The engine should now be ready for operation.
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