Level 1
Level 1 is a basic analysis of the coolant. The
following items are tested:
• Glycol Concentration
• Concentration of SCA
• pH
• Conductivity
The results are reported, and recommendations are
made according to the results. Consult your
Caterpillar dealer for information on the benefits of
managing your equipment with an S·O·S Coolant
Analysis.
Level 2
This level coolant analysis is recommended when the
engine is overhauled. Refer to this Operations and
Maintenance Manual, “Overhaul Considerations” for
further information.
Add the SCA, If Necessary
NOTICE
Do not exceed the recommended amount of supple-
mental coolant additive concentration. Excessive
supplemental coolant additive concentration can form
deposits on the higher temperature surfaces of the
cooling system, reducing the engine's heat transfer
characteristics. Reduced heat transfer could cause
cracking of the cylinder head and other high tempera-
ture components. Excessive supplemental coolant
additive concentration could also result in radiator
tube blockage, overheating, and/or accelerated water
pump seal wear. Never use both liquid supplemental
coolant additive and the spin-on element (if
equipped) at the same time. The use of those addi-
tives together could result in supplemental coolant
additive concentration exceeding the recommended
maximum.
Pressurized System: Hot coolant can cause seri-
ous burns. To open the cooling system filler cap,
stop the engine and wait until the cooling system
components are cool. Loosen the cooling system
pressure cap slowly in order to relieve the
pressure.
1.
Slowly loosen the cooling system filler cap in order
to relieve the pressure. Remove the cooling
system filler cap.
Note:
Always discard drained fluids according to
local regulations.
2.
If necessary, drain some coolant from the cooling
system into a suitable container in order to allow
space for the extra SCA.
3.
Add the proper amount of SCA. Refer to the
Special Publication, SEBU6251, “Caterpillar
Commercial Diesel Engines Fluids
Recommendations” for more information on SCA
requirements.
4.
Clean the cooling system filler cap. Inspect the
gaskets of the cooling system filler cap. If the
gaskets are damaged, replace the old cooling
system filler cap with a new cooling system filler
cap. Install the cooling system filler cap.
i02625506
Cooling System Water
Temperature Regulator -
Replace
SMCS Code:
1355-510
Replace the water temperature regulator before the
water temperature regulator fails. This is a
recommended preventive maintenance practice.
Replacing the water temperature regulator reduces
the chances for unscheduled downtime.
A water temperature regulator that fails in a partially
opened position can cause overheating or
overcooling of the engine.
A water temperature regulator that fails in the closed
position can cause excessive overheating. Excessive
overheating could result in cracking of the cylinder
head or piston seizure problems.
A water temperature regulator that fails in the open
position will cause the engine operating temperature
to be too low during partial load operation. Low
engine operating temperatures during partial loads
could cause an excessive carbon buildup inside the
cylinders. This excessive carbon buildup could result
in an accelerated wear of the piston rings and wear of
the cylinder liner.
SEBU8312-03
65
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