◆ Refractometer -T10007 A-
Note
Read precise value for the following tests at bright/dark boun-
dary. Using a pipette, place a drop of water on the glass to im-
prove the readability of the bright/dark boundary. The bright/
dark boundary can be clearly recognised on the “WATERLINE”.
– Check concentration of coolant additive using refractometer
-T10007- (refer to operating manual) or refractometer
-T10007 A- (refer to operating manual).
The scale -1- of the refractometer is calibrated for coolant addi-
tives G 11; G 12; G 12+ und G 12++.
The scale -2- is only calibrated for coolant additive G13.
Note
◆ The frost protection must be guaranteed to approx. -25 °C.
◆ If a stronger anti-freeze mixture is necessary due to harsher
weather conditions, it can be increased using G 12+ or G
12++. But increase it only to 60 % (frost protection to approx.
-40°C), otherwise frost protection and cooling effectiveness
are reduced again.
– If frost protection is insufficient, drain coolant and top up with
coolant additive G 12++ ⇒ Page 282.
Note
Observe environmental regulations for disposal.
Caution
Only distilled water may be used for mixing. Tap or well wa-
ter does not have the required quality to ensure the effec-
tiveness of coolant.
– Check coolant additive concentration after road test again.
1.4.2 Checking coolant level, replenishing cool-
ant additive if necessary
– Check coolant level in coolant expansion tank when the en-
gine is cold.
◆ Delivery inspection: coolant level above “min.” marking.
◆ Inspection service: coolant level above “min.” marking.
– If coolant is too low, add required amount according to mix-
ture ratio.
Note
If fluid loss is greater than can be expected through normal use,
determine source and rectify (repair measure).
3
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
282
Repair Group 19 - Cooling
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