TP-7070 7/1888 Section 3 Scheduled Maintenance
3.8.7 Coolant Analysis
The coolant analysis interval varies for different
engines, applications, and oil types. Refer to the Engine
Operation and Maintenance Manual for coolant analysis
intervals.
Follow the procedures and recommendations in this
section to ensure that samples provide a good
representation of the coolant condition. Always use the
same procedure for coolant sampling to allow reliable
comparisons.
Regular analysis of the coolant will allow you to prevent
engine problems well before they present themselves,
improve equipment performance, and reduce costly
repairs.
The test can detect:
D Cavitation corrosion
D Chemical distribution
D Leakage of combustion gases
D Contamination
D Electrical earthing (grounding) problems
In extreme conditions, perform the analysis more
frequently. For example:
D In extreme climates
D When the generator set is subject to repeated starts
D When the engine often runs for a long time on low
load
Some signs that the coolant is no longer carrying out its
function may include:
D Engine overheating
D Color alteration
D Deposits p resent
Sampling Point
Sampling is carried out at a representative point in the
system, preferably just after the machine is shut down.
D On KD2000--KD3250 models, take the sample
through the engine venting/bleeding ports, or through
the coolant hose drain ports.
D If there are no other accessible coolant venting/
bleeding ports or drain valves, then take the sample
through the radiator coolant drain valve after draining
the dirty fluid at the bottom of the radiator.
Preparation of Sampling Point
In order to avoid contaminating the sample:
D The sampling point and the sampling equipment
must be meticulously cleaned before each sample is
taken and before opening the system.
D If possible, avoid environmental disturbances when
taking the sample (wind, dust, rain,...).
The laboratory supplied bottle should be filled to 3/4 full.
In the absence of a laboratory supplied bottle, make
sure there is a minimum amount of 250 ml (8.5 oz.).
Use an appropriately labelled and cleaned bottle. Some
important points to note during sampling are:
D Brand and type
D Date of sampling
D Type of equipment and serial number
D Operating hours since commissioning
D Operating hours since last draining
D Type of Sampling: during draining or during a
sampling
D Any coolant top ups. If this is the case, indicate how
many liters (quarts) were added.
D Interventions carried out.
The recommended tests for the coolant analysis are as
follows:
D pH
D Spectrometric analysis (Phosphorus, Zinc, Calcium,
etc.)
D Additives
D Percentage of coolant/water
D Physicochemical analysis (reserve alkalinity, density,
etc.)
D Conductivity.
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