Questions and Answers
How do you locate the compression stroke of the number one cylinder?
What is the purpose of rotating the crankshaft opposite to its normal direction of rotation?
How many degrees before top center (BTC) is the number one piston located at its advanced firing position?
What is the reference point for aligning the correct timing mark on the outer surface of the crankshaft flange?
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What is the direction of rotation of the crankshaft when aligning the correct timing mark on the outer surface of the crankshaft flange?
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Why is it important to rotate the crankshaft in the direction of normal rotation during the final motion?
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Study Notes
Installing the Magneto
- The magneto must be installed with its timing marks correctly aligned.
- The installation requires number one cylinder to be on its compression stroke.
- The number one piston must be at its advanced firing position.
Locating Compression Stroke of Number One Cylinder
- Remove lower spark plugs from number two, three, and four cylinders.
- Remove the upper spark plug from number one cylinder.
- Place thumb over spark plug hole of number one cylinder and rotate crankshaft in normal direction.
- Compression stroke is indicated by positive pressure inside the cylinder, lifting the thumb off the spark plug hole.
Locating Advanced Firing Position of Number One Piston
- Rotate crankshaft opposite to normal direction to approximately 30 degrees before top center (BTC) on compression stroke of number one cylinder.
- Then, rotate crankshaft in normal direction to align correct timing mark on crankshaft flange with parting surface of crankcase below.
- Final motion of crankshaft must be in normal direction of rotation.
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Description
Learn how to correctly install a magneto and configure spark plugs for proper engine functioning. Understand the importance of timing marks, compression stroke, and firing position of number one piston and cylinder.
