Perkins 4GM - Engine Preservation; Introduction; Procedure

TPD1327E Chapter 5
Page 43
Engine uids
Fuel specication
To get the correct power and performance from your
engine, use good quality fuel. The recommended
fuel specication for Perkins engines is indicated
below:
Cetane number 45 minimum
Viscosity 2.0/4.5 centistokes at 40
O
C
Density 0,835/0,855 kg/litre
Sulphur 0.2% of mass, maximum
Distillation 85% at 350
O
C
Cetane number indicates ignition performance. A
fuel with a low cetane number can cause cold start
problems and effect combustion.
Viscosity is the resistance to ow and engine
performance can be effected if it is outside the limits.
Density: A lower density reduces engine power, a
higher density increases engine power and exhaust
smoke.
Sulphur: A high amount of sulphur (not normally
found in Europe, North America or Australasia)
can cause engine wear. Where only high sulphur
fuels are available, it is necessary to use a highly
alkaline lubricating oil in the engine or to renew the
lubricating oil more frequently, see the table below.
Percentage of sulphur
in the fuel (%)
Oil change interval
<0,5 Normal
0,5 to 1,0 0,75 of normal
1,0> 0,50 of normal
Distillation: This is an indication of the mixture of
different hydrocarbons in the fuel. A high ratio of
light-weight hydrocarbons can affect the combustion
characteristics.
Low temperature fuels
Special winter fuels may be available for engine
operation at temperatures below 0
O
C. These
fuels have a lower viscosity and also limit the wax
formation in the fuel at low temperatures. If wax
formation occurs, this could stop the fuel ow
through the lter.
If you need advice on adjustments to an engine
setting or to the lubricating oil change periods
which may be necessary because of the standard
of the available fuel, consult your nearest Perkins
distributor or one of the companies listed on page 6.