Volvo Penta TAMD73P - Page 102

100
4. Coolant temperature too low
CAUSE
● Thermostat malfunction
REMEDY
Install a new thermostat
5. Engine does not reach correct speed
at wide open throttle (WOT)
CAUSE
● Boat abnormally loaded
● Fouling on underwater hull
● Faulty/damaged propeller
● Insufficient fuel flow
– fuel filters clogged (due to contaminants/paraffin
precipitation in the fuel as a result of low outside
temperature)
● Water in fuel
● Insufficient air supply to engine
– air cleaner filter clogged
– air leak between turbo and engine’s inlet mani-
fold
– dirt in turbocharger compressor
– faulty turbocharger
– poor engine compartment ventilation
● Throttle controls incorrectly adjusted
● Charge air cooler (CAC) clogged
● TAMD71B: Faulty by-pass valve
● High back pressure in exhaust system
● Injector malfunction
● TAMD73P and TAMD74: EDC system has tempo-
rarily reduced engine output due to alarm limit
being exceeded.
● Faulty setting of injection pump
● Fault in smoke limiter*
– smoke limiter seizing
– pressure pipe between inlet manifold and smoke
limiter leaking
– faulty diaphragm in smoke limiter
– faulty setting
* TAMD73P and TAMD74 engines are not equipped with a
smoke limiter.
REMEDY
If possible, reduce/redistribute the load
Clean the bottom of the boat and treat it with anti-
fouling paint
Replace the propeller
Fit new fuel filters (pre-filter and/or fine filters). Vent
the system as shown on page 54
Clean fuel tank. Drain water from pre-filter if installed
Fit new air cleaner filter(s)/clean air cleaner filter
Check the rubber hose between the turbo and the
connecting pipe, plus other connections. Tighten the
hose clips
Contact authorized service personnel
Contact authorized service personnel
Check that the ventilating ducts to the engine com-
partment are not blocked
Adjust the throttle controls
Clean the insert(s) as shown on pages 60–62
Contact an authorized Volvo Penta service mechanic
Check that the exhaust pipe is not restricted in any
way
Get authorized service personnel to check the injec-
tors
Check any diagnostic trouble codes (DTC) set, see
page 102. Correct malfunction cause
Contact an authorized Volvo Penta service mechanic
Contact an authorized Volvo Penta service mechanic
Fit a new pressure line
Contact an authorized Volvo Penta service mechanic
Contact an authorized Volvo Penta service mechanic
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