POWR
5-3
6D45F11
Power unit
Power unit
Checking the compression pressure
1.
Start the engine, warm it up for 5 min-
utes, and then turn it off.
2.
Remove the clip from the engine stop
lanyard switch on the tiller handle or
remote control box.
3.
Remove the all spark plugs, and then
install the special service tool to each
spark plug hole.
c
C
Before removing the spark plugs, blow
compressed air in the spark plug well to
clear out any dirt or dust that may fall into
the cylinder.
4.
Fully open the throttle, crank the engine
until the reading on the compression
gauge stabilizes, and then check the
compression pressure.
NOTE:
9
Do not pull the choke knob when checking
the compression pressure.
9
For remote control model. Remove the
throttle link rod and full open the throttle
lever on the carburetor by your finger, and
then measuring the minimum compression
pressure.
5.
If the measured compression pressure is
below specification, or it varies among
the cylinders, add a small amount of
engine oil to the cylinder, and check the
pressure again.
NOTE:
9
If the compression pressure increases,
check the piston and piston rings for wear.
Replace if necessary.
9
If the compression pressure does not
increase, check the valve clearance, valve,
valve seat, cylinder sleeve, cylinder head
gasket, and cylinder head. Adjust or replace
if necessary.
9
Since this outboard motor is equipped with
an automatic decompression mechanism,
accurate data may be difficult to obtain due
to differences in the way the starter rope is
pulled.
Checking the oil pressure
1.
Start the engine, warm it up for 5 min-
utes, and then turn it off.
2.
Remove the oil pressure switch, and then
install an oil pressure gauge
1
to the oil
pressure switch installation hole.
NOTE:
Use a pressure gauge with an adapter with a
1/8 pitch thread.
3.
Check the oil pressure. Check the oil
pump, relief valve, and oil strainer if out
of specification.
Compression gauge
1
:
90890-03160
1
6D450010
1
6D450020
Minimum compression pressure
(reference data):
765 kPa (7.8 kgf/cm
2
, 111 psi)
Oil pressure (reference data):
330 kpa (3.36 kgf/cm
2
, 48 psi)
at idle speed
6D45F11-05 03.10.9 20:44 Page 6
