Mounting the Engine

Make sure the engine is mounted on the aircraft using aircraft grade plywood that’s at least 6mm in thickness for the G26 engine, and 10mm in thickness for the G38 through GT80 twin, or a mount of equivalent strength.

Make sure it’s firmly mounted with 4 bolts.

1.Be sure to set flat washers or a metal plate on the reverse side of the mount to prevent the bolts from sink- ing into the mount. Periodically check the engine mount for loose bolts.

2.Since the engine is equipped with a floatless carbure- tor with a diaphragm pump, the direction of the cylinder and position of the fuel tank can be freely selected.

3.If the engine is mounted on a shock (rubber) mount placed between the engine and the firewall for anti-vibra- tion, check the hardness of the rubber, making sure it’s not too soft, in order to avoid excessive vibration during engine operating rpms. It’s suggested you note carefully if the engine is vibrating at idle as excessive vibration can result in erratic engine operation due to overflow at the carburetor.

4.It is suggested you coat the bolts for the muffler with threadlock when mounting the muffler to the engine.

Operation

Break-In

No specific break-in is required. The engine is gradually broken-in as it is used, and the output power increases gradually as the engine breaks in.

Starting the Engine—Aircraft

Before attempting to start the engine, be sure to read through all the steps for starting the engine as outlined below:

Zenoah engines are equipped with the ultra compact C.D.I. type flywheel magneto ignition system and should be started according to the following procedure:

Note: The magneto system is timed in such a way that when the compression stroke starts (refer to Figure 1-A) sparks are never produced on the spark plug, no matter how fast the pro- peller is flipped. The correct starting procedure is to quickly flip the propeller when the edge of the magnet on the rotor is approaching the coil (Figure 1-B). This means that the propeller should be quickly flipped at about 90 degrees in crank angle before the compression stroke is about to start.

Coil

Magnet

Fig 1-A

Fig 1-B

1.Make sure the spark (glow) plug(s) are installed and tightened. Check the condition of the plug cap for cracks or breaks.

2.Be sure the propeller is properly secured.

3.Make sure the fuel tank line(s) are properly connected. The main line should be connected to the carburetor spray bar.

4.Be certain the mufflers are installed properly.

5.Fill the fuel tank.

6.Choke the engine and turn the propeller through a

few times until the fuel appears at the carburetor.

7.Set the throttle valve at the idle position or at the position slightly open from idle.

5

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APC Zenoah instruction manual Mounting the Engine, Operation, Break-In, Starting the Engine-Aircraft
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Zenoah specifications

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