
ALPHA series engines worksHoP mAnuAL
48
to be retained. Some heat exchangers may be
fitted with a drain plug.
2. Slacken a bottom hose clip and slide the hose off.
3.Remove the radiator, heat exchanger or
expansion tank filler cap and allow sufficient
time for the system to drain.
2.45.4 flushing the Cooling system
flushing the radiator or Heat exchanger
With the bottom water hose removed flush the
radiator, make-up tank or heat exchanger through
the filler with clean fresh water, preferably using
a hose pipe, until clean water emerges and then
replace the filler cap and hoses.
flushing the engine Block
With the top and bottom hoses removed from the
engine, flush the block through the top hose with
clean fresh water, preferably using a hose pipe,
until clean water emerges and then replace the
hoses.
2.45.5 filling the Cooling system
CAution
Under some circumstances an air lock could
occur in the cylinder head when filling the
system causing a false level indication.
1. Replace the hoses and tighten the hose clips.
2. Slacken or remove a plug to allow the air in the
system to vent as the water is being added. The
position of the water bleed screw is to the right
and rear of the water pump back plate.
3. Slowly refill the system with clean fresh water
and coolant concentrate to a 40% concentration
through the filler cap.
See 2.45.2 Engine Block Coolant Capacity.
4. Replace the filler cap and vent plug.
5. Run the engine for a few minutes and check the
coolant level.
2.46 CooLAnt ConCentrAte
Refer to "03.3 Engine Fluids - coolant concentrate".
wArning
Coolant concentrate must not be allowed to
come into contact with the skin; adhere to the
manufacturers instructions and precautions.
wArning
Extreme care must be taken to ensure that
coolant concentrate, solvents or other toxic
wastes are disposed of in accordance with local
regulations to prevent contamination.
2.47 tHe tHermostAt
A common thermostat is not fitted therefore
reference should be made to the Master Parts
Manual for comprehensive information.
The thermostat housing cover for the various builds
must be fitted as shown.
Figure 2.47.1 Thermostat Housing Cover
A - LPW3, LPWS4 Build 70
B - Builds 40,41,42,43,44,45,46,47,48,49, 71,72,173,174
C - All other builds
2.47.1 Thermostat Identification
There have been a number of different thermostats
used but these have been standardised to three.
Each has a colour code on the top and the
temperature rating stamped on the lower skirt.
Illustration
Part Number
ºC Rating
A
751-40982
88º
B
751-40981
74º
C
751-40983
74º
Figure 2.47.2 Thermostat Identification
note:
on 751-40983 thermostat the jiggle pin is
not fitted and 2 x 5mm diameter holes are
added.
2.47.2 removing the thermostat
The early type of thermostat, shown as C
1
is not
interchangeable with later types shown as C
2
which
can be identified by the lower skirt profile.
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