1D-1 Power Unit Mechanical:
Power Head
Power Unit Mechanical
General Description
Power Unit Construction Description
Z9J0111401001
The power unit is direct water cooled, in line 4 cylinder, 4
stroke gasoline unit with its DOHC (Double overhead
camshaft) valve mechanism for “V” type valve
configuration and 16 valves (4 valves/one cylinder).
The double overhead camshaft is mounted over the
cylinder head, it is driven from crankshaft through driven
gear and timing chain, and no pushed rods are provided
in the valve train system.
Powerhead Direction of Rotation
This outboard motor is designed with a L.H. (left-hand)
rotation powerhead utilizing an offset crankshaft.
This design has the advantage of reducing the size of
the motor and keeping the overall motor's weight closer
to the boat transom and therefore closer to the boat C/G
(Center of Gravity).
Rotation of the driveshaft is accomplished through a
crankshaft drive gear and a driveshaft driven gear.
These gears are located beneath the powerhead in the
same oil bath location as the camshaft chain.
As the rotational direction of the driven gear will be
opposite of the drive gear, a left-hand rotation
powerhead design was adopted to retain a conventional,
standard rotation (right-hand) propeller shaft output.
Cylinder Number
Cylinder number is as mentioned in figure.
Diagnostic Information and Procedures
Cylinder Compression Check
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Refer to “Cylinder Compression Pressure Check” in Section 0B (Page 0B-21).
Oil Pressure Check
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Refer to “Oil Pressure Check” in Section 0B (Page 0B-20).
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