Check Operation Of The Oil Injection System (Engine Running); Oil Pump Volume (Flow) Test; Troubleshooting - Mercury 40 Service Manual

Check Operation of the Oil Injection
System (Engine Running)

OIL PUMP VOLUME (FLOW) TEST

WARNING
The input fuel line TEE fitting from which the oil
line was removed MUST BE CAPPED OFF to pre-
vent fuel leakage while the engine is running.
NOTE: The following specifications are determined
with the outboard running off a remote fuel supply
with pre-mix fuel. The oil pump output hose (clear)
must be disconnected from the input fuel line TEE fit-
ting and directed into a graduated container. The in-
put fuel line TEE fitting from which the oil line was re-
moved MUST BE CAPPED OFF to prevent fuel
leakage while the engine is running.
c
a - Bleed Screw
b - Inlet Hose
c - Outlet Hose
40/50 H.P. Flow Specifications:
@ 1500 RPM with oil pump link arm DISCON-
NECTED and pump arm rotated FULL COUNTER-
CLOCKWISE and HELD AGAINST PUMP CAST-
ING
15.0cc 3.0 cc of oil in 10 minutes.
60 H.P. Model Flow Specifications:
@ 1500 RPM with oil pump link arm DISCON-
NECTED and pump arm rotated FULL COUNTER-
CLOCKWISE and HELD AGAINST PUMP CAST-
ING
22.0cc 3.0 cc of oil in 10 minutes.
3C-8 - FUEL SYSTEM
a
b
52047

Troubleshooting

1. Fill tank with recommended oil.
2. Inspect the oil pump inlet hose for air bubbles. If
air exists, place a shop towel below the oil pump
and loosen bleed screw four turns. Allow oil to
flow out of the bleed hole until air is removed from
the hose.
3. Inspect the oil pump outlet oil hose for air
bubbles. If air exists, disconnect link rod from oil
pump. Start engine and run at 1000 to 1500 RPM.
Rotate (and hold) the pump arm full counter-
clockwise until the air is purged out of the hose.
b
a
c
a - Inlet Hose
b - Outlet Hose
c - Bleed Screw
d - Link Rod
e - Pump Arm
1. Check oil level in oil tank. If oil level is approxi-
mately 14.5 fl. oz. (435 ml) or less, the problem
is low oil level. Add oil to oil tank.
NOTE: There is a safety reserve of oil left in the oil
tank after the low oil warning is sounded that allows
enough oil for approximately 0.5 hours of full throttle
operation.
2. If there is more than approximately 14.5 fl. oz.
(435 ml) of oil remaining in tank, then the problem
may be a faulty low oil warning sensor. Refer to
troubleshooting chart following.
e
d
90-852572R1 JANUARY 1998