ALPHA SERIES ENGINES WORKSHOP MANUAL
47
gear while holding the palm of the hand over the
two ports and listen for a sucking/pumping sound.
8. Clean the strainer.
2.44.2 Refitting the Pump and Strainer
1.
Refit
the pump to the crankcase with the cut-out
section of the pump
flange
(X) facing towards
the top of the crankcase.
Figure 2.44.2 Oil Pump Locating Cutout
2. Replace and torque the two pump retaining bolts
to 9.0Nm (6.5lbf ft).
3. On early engines only:
Fit a new copper washer to the pump inlet port;
the inlet port is on the right hand side of the pump
when viewed from inside the crankcase.
4. Replace the oil strainer, strainer bracket bolt,
spacer, washer and locknut.
5. Tighten the oil strainer pipe nut to 27.0Nm
(20.0lbf ft); ensure the strainer gauze is parallel
with the sump base leaving 6mm gap.
6. Replace the relief valve to the left hand pump
port and tighten the retaining nut.
7. Replace the camshaft, end cover and crankcase
door.
2.45 THE WATER COOLING SYSTEM
The basic engine is supplied with a freshwater
circulation pump but the radiator and cooling fan
are
specified
as accessories and can be engine
mounted or supplied loose depending on the
engine application.
Marine engines are usually
fitted
with a heat
exchanger and a cooling system make-up tank.
2.45.1 R
adiator Cooling
Radiators can be engine or remote mounted
including some which may not have been originally
fitted by Lister Petter Power Systems
.
The radiator capacity must be determined then
added to that given in "2.45.2 Engine Block Coolant
Capacity".
An additional amount must also be taken into
consideration for the capacity of the hoses on
remote radiator applications.
2.45.2 E
ngine Block Coolant Capacity
It is advisable to ascertain the coolant capacity
before determining the amount of coolant
concentrate to be added to maintain a 40%
concentration. Aluminium radiators require 50%
mix of water and coolant.
When topping up or
refilling
the engine’s water
system, do not use tap water, typical minerals and
ions found in tap water can be corrosive to internal
engine components including radiators, and can
cause a more rapid depletion of the anti-corrosion
additives found in most antifreeze.
Action required:
Refer to your coolant additive manufacturer to
establish the lower temperature operating range if
appropriate.
When topping up coolant please ensure that the
“top up” is of the correct concentrate mix and not
just water. It is recommended that this process is
repeated at minimum 12 month service intervals.
The
specification
of the coolant concentrate should
comply with one of the following:
BS6580 : 1985; MIL-A-
1
1755D; MIL-A-46153/B.
CAUTION
The cooling system is pressurised, extreme care
must be taken when removing the radiator cap
if the engine is hot.
Engine
litre
pint
US gal
LPW/LPWS2
2.1
3.7
0.55
LPW/LPWS3
2.5
4.4
0.66
LPW/LPWS4
3.0
5.3
0.79
2.45.3 D
raining the Cooling
S
ystem
WARNING
The cooling system is pressurised and extreme
care must be taken when removing the radiator
or expansion tank cap if the engine is hot.
1.Place
a suitable container under the radiator or
heat exchanger bottom hose if the coolant is
Lister Petter Power Systems engines are often
built with aluminium core radiators rather than
copper nowadays. In order to protect and ensure
the longevity of all water system components, the
water used is critical. Like vehicle manufacturers
we are now recommending mixing de-ionized or
distilled water with your antifreeze or coolant
inhibitor.