SkyTrak 6036 Service Manual - Manual (Page 104)

Section 8A Perkins Engine
8A-12 Model 6036/6036T S/N 9B0500 thru 14833
8A.10 ENGINE OIL
SPECIFICATIONS
Use 10W30 or 15W40 motor oil that is equal to
API, CD or CE (severe duty diesel engine) specifi-
cations.
Engine Oil Type Ambient Temperature
10W30 Below 23 °F (-5 °C)
15W40 Above 23 °F (-5 °C) MA1510
8A.11 ENGINE COOLING
SYSTEM
The engine cooling system consists of coolant
passages in the engine, a thermostat, pump,
hoses, a radiator and a radiator overflow bottle.
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 prepacked with a
special grease during assembly and do not require
attention in service.
8A.11.1 Coolant Requirements
The quality of coolant will determine the efficiency
and life of the cooling system.
1. Check antifreeze concentration, Fig. 8A.22,
several weeks before the beginning of the cold
season. The antifreeze must have an ethyl-
ene glycol (ethanediol) base. Use a low
silicate antifreeze that conforms to one of the
standards given below or which contains no
more than 0.1 percent anhydrous alkali
metasilicate.
• U.S.A.—Engineering Standard
GM6038-M.
• 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
2. There is an advantage to using antifreeze
even when frost protection is not necessary.
Antifreeze protects against corrosion and also
raises the boiling point of the coolant. A 50
percent concentration of antifreeze is pre-
ferred, but if this much protection is not
required, a 33 percent concentration can be
used. Never use more than a 65 percent
concentration under any condition. Where
frost protection will never be required, add an
approved corrosion inhibitor to clean soft
water. Change the water/corrosion inhibitor
every six months or according to the
manufacturer's recommendations.
• 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. The
formations usually deposit in the cooler
section of the cooling system, such as the
radiator bottom tank.
• USE SOFT, DISTILLED OR DEIONIZED
WATER to reduce the potential and the
severity of silicate dropouts.
IMPORTANT: If you use water without a corro-
sion inhibitor, rust will form and plug the small
holes in the head gasket. These holes are orifices
and their size is critical. Do not enlarge the size of
the orifices. To do so will disturb the coolant flow
and will not solve an overheating problem. If you
use water without a corrosion inhibitor for even a
relatively short period, the cup plugs will rust
through, allowing coolant to leak. An incorrect or
malfunctioning radiator cap can result in the loss
of coolant and the engine running hot. Any
sudden loss of coolant from a heavily loaded
engine can result in severe damage to the pistons
and cylinder bore.
NOTE: Some corrosion inhibitor mixtures contain
soluble oil which can have an adverse effect on
some types of water hose.
Fig. 8A.22 Testing Antifreeze Concentration
HYDROMETER