1D-1 Power Unit Mechanical; General Description; Power Unit Construction Description; Diagnostic Information And Procedures - Suzuki DF70A Service Manual

1D-1 Power Unit Mechanical:

Power Unit Mechanical
Power Head

Power Unit Construction Description

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.

Cylinder Compression Check

Refer to "Cylinder Compression Pressure Check" in Section 0B (Page 0B-21).

Oil Pressure Check

Refer to "Oil Pressure Check" in Section 0B (Page 0B-20).

General Description

Z9J0111401001

Diagnostic Information and Procedures

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.
No.1
No.2
No.3
No.4
I9J011140077-01
Z9J0111404001
Z9J0111404002