OPERATING AND MAINTENANCE—C.5
17.
To prevent corrosion, spray the engine with
POWERPART Lay-Up 3. Do not spray inside the
alternator cooling fan area.
NOTE:
Before the engine is started after a
period in storage, operate the starter
motor with the engine stop control in
the "off" position until oil pressure
shows on the gauge or the oil
warning light goes out. If a solenoid
stop control is used, this will have to
be disconnected for this operation.
If the engine protection is done correctly according to
the above recommendations, no corrosion damage will
normally occur. Perkins Engines Ltd., are not
responsible for any damage that occurs in relation to a
service storage period.
ENGINE COOLANT
The quality of the coolant used can have a large effect
on the efficiency and life of the cooling system. The
recommendations given below can be of assistance in
the maintenance of a good cooling system with frost
and/or corrosion protection.
1.
Where possible, use clean soft water.
2.
If an antifreeze mixture is used to prevent frost
damage,
it
must
have
an
ethylene
glycol
(ethanediol) base. An antifreeze that is to one of
the standards given below or to an equal standard
is acceptable if the pH value is kept within the
range of 7.0-8.5 when diluted.
U.K.
BS 3151:1959
‘Ethanediol Antifreeze Type B with Sodium
Benzoate and Sodium Nitrate Inhibitors'.
U.S.A.
ASTM 03306-74
‘Ethylene Glycol Base Engine Coolant'.
Australia
AS 2108-1977
‘Antifreeze Compounds and Corrosion
Inhibitors for Engine Cooling Systems'.
When Perkins POWERPART Antifreeze is used, the
correct mixtures of antifreeze and water are as given
below. Perkins POWER PART Antifreeze fully passes
the above standards.
Lowest Temp.
% Volume
Mixture-Ratio by
of
of POWERPART
Vol. POWERPART
Protection Needed
Antifreeze
Antifreeze: Water
-12C( 10F)
25
1:3
-18C( 0F)
33
1:2
-25C (-13F)
40
1:1.5
-37C (-34F)
50
2:1
-60C (-76F)
66
2:1
The quality of the antifreeze coolant must be
checked at least once a year, for example, at the
start of the cold period.
3.
When frost protection is not necessary, it is still an
advantage to use an approved antifreeze mixture
as this gives protection against corrosion and also
raises the boiling point of the coolant. A minimum
concentration of 25% by volume of antifreeze is
necessary, but it is our recommendation that a 33%
concentration by volume is used.
If an antifreeze is not used, add a correct corrosion
inhibitor mixture to the water.
Change the water/corrosion inhibitor mixture every
six months or check according to the inhibitor
manufacturer's recommendations.
Note:
Some corrosion inhibitor mixtures
contain soluble oil which can have an
adverse effect on some types of
water hose.
If the correct procedures are not used, Perkins
Engines Ltd. can riot be held responsible for any frost or
corrosion damage.
To Drain the Cooling System
1.
Remove filler cap from header-tank.
2.
Drain water from header tank and engine cylinder
block by opening all drain cocks and plugs. The
cylinder block may be flushed back through the
drain points with the thermostat removed. If it is
decided to refill the fresh water system with
antifreeze or corrosion inhibitor, see this page.
3.
If the engine is to be layed up for the winter season,
the raw water system should also be drained.
Before commencing draining, the sea cock should
be turned off and then all drain cocks opened and
plugs removed. The removal of the sea water hose
at the lowest point of the engine will assist in
complete drainage of the raw water.
4.
If the engine is to be left drained during freezing
conditions, 1/2 pint (250 ml) of undiluted antifreeze
should be added to the oil coolers to prevent
freezing should any water drain into the coolers if
the boat is moved.
