SkyTrak 6036 Service Manual - Manual (Page 95)

Section 8. Engine
Model 6036 S/N 9B0499 and Before 8-9
An approved antifreeze as described in
paragraph 2 protects against corrosion and
also raises the boiling point of the coolant. A
50 percent concentration of antifreeze is
preferred, but if there is a less likely chance
that this much frost protection is required, a
mixture of not less than 33 percent concentra-
tion can be used. If antifreeze is not used,
add an approved corrosion inhibitor mixture to
the water. Change the water/corrosion
inhibitor every six months or check according
to the inhibitor manufacturer's recommenda-
tions.
NOTE: Some corrosion inhibitor mixtures contain
soluble oil which can have an adverse effect on
some types of water hose.
8.2.2 Piston Cooling Jets
Current turbocharged engines have piston cooling
jets which direct cooled lubricating oil into the main
pressure rail at the base of each cylinder liner onto
the underside of each piston crown where it
circulates, dispersing heat from the combustion
area. The oil then drains back to the sump. The
lubricating oil feed to the jet nozzle is controlled by
a pressure relief valve fitted into the main body of
the piston cooling jet assembly and comes into
operation at a pressure of approximately 30 psi
(206,7 kPa).
8.2 ENGINE COOLING SYSTEM
The engine cooling system consists of coolant
passages in the engine, a thermostat, pump,
hoses, a radiator and a radiator overflow tank.
The engine is cooled by the circulation of coolant
through passages in the cylinder block and head.
Circulation is by thermo-syphon action assisted by
an impeller type water pump driven by a V-belt
from the crankshaft pulley.
The water pump bearings are pre-packed with a
special grease during assembly and do not require
attention in service.
8.2.1 Coolant Requirements
The quality of coolant will determine the efficiency
and life of the cooling system.
• DO NOT USE HARD WATER in the cooling
system. Hard water, or water with high
levels of calcium and magnesium ions,
encourages the formation of silica gel
formations, especially after a number of
heating and cooling cycles. These gel
formations can result in loss of cooling or
heating in radiators and cab heater cores by
coating and plugging the tubes. It usually
deposits in the cooler section of the cooling
system, such as the radiator bottom tank.
• USE DISTILLED WATER OR DEIONIZED
WATER to reduce the potential and the
severity of silicate dropouts.
1. Where frost protection will never be required,
use clean soft water with an approved corro-
sion inhibitor in soft water.
2. If an antifreeze mixture is used to prevent frost
damage it must have an ethylene glycol
(ethanediol) base. An antifreeze that con-
forms to one of the standards given below or
to an equal standard is acceptable if the pH
value is from 7.0 to 8.5 when diluted.
• U.S.A.—ASTM D3306-74: Ethylene Glycol
Base Engine Coolant
• U.K.—BS 3151: 1959: Ethanediol Anti-
freeze Type B with Sodium Benzoate and
Sodium Nitrite Inhibitors
• Australia—AS 2108-1977: Antifreeze
Compounds and Corrosion Inhibitors for
Engine Cooling Systems
Check the quality of the antifreeze coolant at
least once a year, for example, at the start of
the cold period.
3. There is an advantage to using antifreeze
even when frost protection is not necessary.
1. Filter Head
2. Connection
3. Gasket
4. Stud (2)
Fig. 8.17 Oil Filter with Integral Oil Cooler
5. Nut (2)
6. Washer (2)
7. Connector
8. Oil Cooler
9. Seal
10. Oil Filter
11. Hose Clamp
12. Hose
4
3
1
6
5
7
2
9
12
11
8
10
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