2-2
IO-240 Series Engine Installation & Operation Manual
31 October 2011
Engine Description
2-1.1. Engine Model Number Definition
The description of each alphanumeric character in the engine model number is given
below for the example engine model number IO-240-B1B (Figure 2-1).
Figure 2-1. Engine Model Definition
2-1.2. Cylinder Number Designations
•
The front of the engine is the end closest to the propeller and the rear of the engine is
the accessory end.
•
Viewed from the rear of the engine, the left-side cylinders are designated by even num-
bers 2-4, with Cylinder 2 being closest to the rear.
•
The right side cylinders have odd number sequential designation 1-3, with Cylinder 1
being closest to the rear.
•
Firing order of the engine is 1-3-2-4.
Figure 2-2. Cylinder Number Designation
I O - 240 - B 1
Specification Number
Model Identifier
Cubic Inch Displacement
Horizontally Opposed Cylinders
Fuel Injected
B
Shipping Designation
I O - 240 - B 1
Specification Number
Model Identifier
Cubic Inch Displacement
Horizontally Opposed Cylinders
Fuel Injected
B
Shipping Designation
4
2
3
1
4
2
3
1
Summary of Contents for IO-240-A
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