Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
The valve is turned on as soon as safety lanyard
is installed on its post. The valve opening allows
ventilation of crankcase.
The OSPS monitors the pressure to detect a mal-
function of this valve. If pressure rises above a
preset threshold, the valve is re-energized again
and if it fails, a fault code is generated.
The TOPS switch (mercury type), located besides
the MPEM (on MPEM bracket), monitors the wa-
tercraft position. If the watercraft rolls above a
preset threshold (or tips over) the switch opens
and the ECM closes the valve to prevent oil in
engine crankcase to flow towards intake mani-
fold. Besides, the engine RPM will be gradually
reduced then engine will be stopped.
1
R1503motr179A
TYPICAL 4-TEC ENGINE
1. TOPS valve
R1503motr351A
1
TYPICAL 4-TEC SUPERCHARGED ENGINES
1. TOPS valve
Resistance Test
Disconnect the connector from the TOPS valve
and check the resistance of the solenoid itself.
The resistance should be between 1.27
and
2.47
.
Otherwise, replace the TOPS valve.
Dynamic Test
Activate the TOPS valve by installing the safety
lanyard on the DESS post.
If you can hear the movement of the piston (knock-
ing), the valve works fine, otherwise follow the
procedure shown in the following chart.
NOTE:
Take into account that you could hear the
piston movement and the valve might not be
working properly. The retaining washer could be
unlocked from the piston shaft. Disassembly will
reveal its condition.
TOPS Valve Replacement
Disconnect the wiring harness from the TOPS
valve.
Remove the oil separator cover. Refer to OIL
SEPARATOR REPLACEMENT in the LUBRICA-
TION SYSTEM section.
434
smr2004-Complete Line Up
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