A20
The Fresh water system is pressurized by the cap atop expansion tank. When proper pressure is reached, excess
water is expelled through the overflow tube under tank. Extreme care should be taken in removing cap while engine
is hot. While engine is hot,
if
there is liquid in tank, the system may be refilled with safety if not, allow engine
to
cool before refilling. Lehman Power recommends the use of anti
-
freeze at all times used in accordance with the
manufacturer’s recommendations. Ethelyne Glycol based solutions are preferred, most
of
which includes various
rust inhibitors. The use of “stop
leak type anti
-
freeze, which may still be available in some areas, is discouraged.
If,
for some reason anti
-
freeze solution is not being used in freezing temperatures, it is essential that the water
systems be drained while engine stands idle and refilled before engine is restarted. Check water supply daily.
Maintain level
to
approximately one
-
half inch below top of tank
-
The small “pillar” in the tank should just touch
the water surface.
To assist in corrosion control, a zinc pencil is installed in your heat exchanger. This zinc pencil is sacrificial
....
that
is, the raw water will attack and “eat away” the zinc before attacking metal of the heat exchanger.
It
is suggested
that the plug accommodating this pencil be removed each week while engine is in service in order
to
inspect zinc.
Replace zinc element when required. Failure
to
install zincs when needed may cause serious damage
to
entire
cooling circuit.
It
will be noted that your heat exchanger has removable end caps
to
facilitate cleaning. Removing caps will allow
access to end of the tube “bundle”. To clean tubes use a
3/16”
diameter wood dowel, with a “twisting” action rather
than a hammering action.
A
small caliber firearms cleaning kit or similar small brush may be used.
Do
not use a
metal rod which may rupture the copper tubings.
LEHMAN NATURALLY ASPIRATED ENGINES
FRESH
&
RAW WATER CIRCUITS
RAW WATER PUMP
GEAR
D?IVEN
HEADER/ EXFPiNSlON
TANK WITH
DE--SYSTEM
ENGINE
!I
I I’
‘I
TRANSMISION
OIL
COOLER
30LED
FRESH
&
RAW WATER CIRCUITS
(TURBO
-
SIMILAR MINUS INTERCOOLER)
FRESH
WTER
A
RAW WATER
FRESH
WATER
a
INTERCOOLER
5P225
RAW WATER
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