Affected by temperature, atmospheric oxygen and time, these biodiesel components in the fuel
may decompose in the fuel and thus cause damages within the fuel system.
The fuel must be filtered before it is filled into the machine when it has been supplied in bar‐
rels or canisters. This procedure prevents malfunctions in the fuel system caused by contami‐
nation.
2.8.4 Engine coolant recommendation
In fluid-cooled engines, the cooling fluid must be treated and monitored to prevent engine damage.
Water quality:
An important factor in the treatment of cooling fluid is the correct water quality.
As a rule, clear, clean fresh water must be used, which should be as soft as possible and in ac‐
cordance with the following analytical values:
Feature
Value
pH value
6.5-8.0
Chloride
[mg/l]
Max. 80
Ch sulfate
[mg/l]
Max. 160
Alkaline ground ions
mmol/l
2.7
Hardness
°dH
15
1°dH = 0.1783 mmol/l; alkaline ground ions = 7.147 mg/l Ca
2+
or 4.336 mg/l Mg
2+
Tab. 32 Water quality specification
Contact the local water utilities for information regarding water quality. If the water does not meet
the above parameters, it must be treated.
If suitable water is not available, distilled or demineralized water should be used for treating the
coolant. Seawater, brackish water, brine and industrial wastewater are not suitable. Salts may
cause corrosion or the formation of disruptive residues.
Coolant quality:
In the course of ongoing technical development, a new corrosion inhibitor/antifreeze has been ap‐
proved by the engine manufacturer.
This features the following advantages over the corrosion inhibitors/antifreeze that was approved
previously:
■ Less residue in the engine cooling system
■ Improved heat flow
■ Improved environmental compatibility
The coolant (cooling fluid) is treated by the addition of anti-freeze with ethylene glycol-based anti-
corrosion additives to the water.
The coolant used must be in accordance with the stipulations provided by the engine manufacturer
KUBOTA.
2
Technical Data
2.8
Engine
16
Operator Manual Portable Rotary Screw Compressor
MOBILAIR M55 PE SIGMA CONTROL SMART pV
No.: 902366 10 USE
