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3.3.4
Surge (Expansion) Tank for
Horizontal Discharge Radiator
A horizontal discharge remote radiator requires the use
of a surge (expansion) tank. Locate the tank at the
highest point in the cooling system. The surge tank
provides venting, surge/expansion protection, and
filling/makeup functions.
D
Equip the surge tank with a sight-glass gauge,
overflow tube, and pressure cap.
D
Size the surge tank to handle 6%--10% of the total
cooling system volume.
D
Connect the main line from the surge tank to the
highest point of the remote radiator. Most vertical
core radiators have the surge tank as part of the
radiator top tank. The setup illustrated in Figure 3-8
provides for radiator and engine deaeration and a
positive pressure at the pump suction inlet.
D
Use a strainer to filter dirt, scale, and core sand from
the coolant line.
Piping. Size water piping between the engine and the
remote radiator large enough to eliminate the need for a
booster pump. If the cooling system requires a booster
pump, contact your distributor/dealer.
Use piping of ample size and with as few short sweep
bends or elbows, tees, and couplings as possible. Use
long sweep elbows or long bends, if bends are required.
Installation. Support piping externally, not from the
radiator or engine.
On standard remote radiators, connect radiator bottom
outlets only to the suction side of pump. Plumb lines to
prevent air from becoming trapped in the lines. Route
piping in one general direction, either upward or
downward. A combination of both upward and
downward piping creates air pockets in the piping.
Route vent lines to the expansion/surge tank without
creating low spots in the lines.
Flexible connections. Provide flexible connections
when connecting piping to the radiator assembly. Use
hose clamps at all nonthreaded connections.
TP-6609 6/08
Shutoff valves. Locate shutoff valves between the
engine and cooling system to allow for isolation of both
the radiator and the engine. A shutoff valve eliminates
the need to drain the entire cooling system during
service.
3.3.5
Procedure to Fill with Deaeration
For radiators designed for full deaeration, fill the radiator
according to the following procedure:
1. Fill the radiator at the filler neck.
2. Next, fill the radiator through one of the top tank or
expansion/surge tank inlets located before the final
hose connection.
3. Continue filling the system to cover the filler neck
bottom until coolant appears in the sight glass
located in the radiator top tank.
4. Check and correct any leaks in the system.
3.3.6
Procedure to Fill without
Deaeration
For radiators designed without deaeration, fill the
radiator according to the following procedure:
1. Initially, fill the radiator through one of the top tank
inlets located before the final hose connection for
faster and more complete fillup.
2. Continue filling the system to cover the filler neck
bottom until coolant appears in the sight glass
located in the radiator top tank.
3. Check for and correct any leaks in the system.
Section 3 Air and Cooling
27
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