Maneuvering
Operation at low load
Avoid long-term operation at idle or at low load, since
this can lead to increased oil consumption and even-
tually to oil leakage from the exhaust manifold, since
oil will seep past the turbocharger seals and accom-
pany the induction air into the inlet manifold at low
turbo pressure.
One consequence of this is carbon build-up on valves,
piston crowns, exhaust ports and the exhaust turbine.
At low loads, the combustion temperature may
become so low that complete combustion cannot be
ensured, resulting in possible fuel dilution of lubricating
oil and eventually leakage from the exhaust manifold.
If the following points are done as a complement to
normal maintenance, there will be no risk of malfunc-
tions caused by operation at low load.
•
Reduce operation at low load to a minimum. If the
engine is regularly test-run without load once a
week, the duration of this operation should be lim-
ited to 5 minutes.
•
Run the engine at full load for about 4 hours once a
year. In this way carbon deposits in the engine and
exhaust system are given the chance to burn up.
Operation
47702660 03-2013 © AB VOLVO PENTA
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