Coolant outlet for external heating General

Coolant outlet for external heating
General
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Flow overview of the external heating circuit.

GeneralThe engine’s coolant can be used to heat external elements, e.g. cabinets, crane cabs and storage boxes.

Heat is taken from the coolant flow in the cylinder block to an external circuit and is returned via the return pipe after the radiator.

More information on filling the coolant can be found in the document “Filling cool-ant and bleeding the cooling system”.

Environment

Drained coolant should be treated as environmentally hazardous waste.

Note:• Contact a Scania dealer to connect a coolant outlet for the external heating of a

gas engine.• When driving in lower ambient temperatures, there is a risk that the cooling sys-

tem on fuel-efficient engines will not produce enough excess heat to contribute to heating external circuits.

Scania Truck Bodybuilder 22:10-645 Issue 4 2020-09-14© Scania CV AB 2020, Sweden 1 (22)

General


IMPORTANT!

• Use the recommended connection points. More information is found under the heading Coolant outlet location.

• Coolant that is fed back into the engine should not be hotter than it was when the coolant left the engine.

• Pipes and hoses should have a continuous slope to avoid liquid traps.• Do not use components with significant exposure to coolant, e.g. pipes or heat ex-

changers made of brass or copper or with zinc plating. This may cause sludge to form in the coolant. It is fine to use smaller brass components, such as nipples.

• Connect the return hose from the external circuit to the designated union on the return pipe. More information is available under the heading Coolant return.

• Some coolants can cause corrosion in the cooling system. Only use coolant ap-proved by Scania. Contact a Scania dealer for more information.

• Protect coolant hoses from contact with oil and diesel, as this may damage the hoses and cause leakage.

• If an auxiliary electric circulation pump is connected to an external circuit the maximum permitted total flow is 30 l/min.

• It is important that there is no air in the system. Scania recommends that the ex-ternal circuit is bled at its highest point and at the point that is furthest away from the pump.

• If there is a valve or thermostat in the external circuit, it must be opened before bleeding. If valves and thermostats are not opened before bleeding, air may re-main in the system. A cooling system containing air may result in the expansion tank being emptied and the coolant pump sucking air, which may damage the coolant pump.


Warm-up time for Euro 6 engines


Warm-up time for Euro 6 enginesIMPORTANT!

The maximum possible heat output is limited by how long it takes for the engine to warm up to 60°C. The warm-up time must not exceed 20 minutes.

An extended warm-up time may result in increased fuel consumption and the cata-lytic converter’s emission control function may be affected. The lifetime of the en-gine may be affected, particularly for vehicles with EGR (Exhaust Gas Recirculation).

If the external heating circuit is used in conditions below 0°C, a thermostat or valve must be installed. The thermostat or valve should not open the flow to the circuit until the engine coolant temperature has reached 60 °C. The thermostat or valve must en-sure that the engine’s warm-up time does not become excessive.

A thermostat with leakage flow should be positioned as close to the location of the coolant outlet as possible.


Various types of external heating circuits


Various types of external heating circuitsLow-level external circuitThe entire external circuit is below the engine’s highest point and lower than the cooling system’s expansion tank.

Bleeding can take place via the expansion tank.

High-level external circuitParts of the external circuit are above the engine’s highest point and higher than the expansion tank.

At least one ventilating valve is required at the external circuit’s highest point.

Pipes and hoses should have a continuous slope to avoid liquid traps. It is strongly recommended that the coolant inlet is positioned in the lower part of the heat ex-changer and the outlet in its upper part to allow bleeding.

IMPORTANT!

Please contact a Scania workshop before installing a high-level external circuit on vehicles with a 7 litre engine.


Examples of external heating circuits


Figure 3: Thermostat (T) or valve (V) for the installed external circuit.

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Figure 1: Thermostat (T) or valve (V) for external circuit with separate pump and heater.

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Examples of external heating circuits• Figure 1: Thermostat or valve for external circuit with separate pump, external

heater and check valve. This enables heating of the coolant both when the engine is cooler than 60°C and when the engine is switched off.

• Figure 2: Thermostat with leakage flow in external circuit• Figure 3: Thermostat or valve in external circuit.

Figure 2: Thermostat (T) with leakage flow installed to the external circuit.

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Coolant outlets for 9 and 13 litre engines.

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Coolant outlet locations7, 9 and 13 litre enginesCoolant outlets on 7, 9 and 13 litre engines, see arrows in illustrations.

Information on connection unions can be found under the heading Part information.

Coolant outlet for 7 litre engine.




2 1

3

A

B

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A. Left-hand side.B. Right-hand side.

16 litre enginesThere are three possible connection points for coolant outlets on 16 litre engines, see illustration.

Note:Use of connection union (part number 1 745 705) is only permitted on 16 litre en-gines.

• Use the rear connection (1) on the left side of the engine in the first instance; it is fitted with a blanking piece and is normally easily accessible.

• The front connection (2) on the left-hand side of the engine is fitted with a flange with a connection nipple. This connection is often difficult to access. The loca-tions of the blanking piece (1) and flange (2) can be changed.

• The rear connection (3) on the right side of the engine is fitted with a blanking piece.

More information on connection unions can be found under the heading Part infor-mation.


Work description


Work descriptionWARNING!

• The coolant in a warm engine is very hot and can cause burns.• The cooling system may be exposed to pressure.• Protect your eyes and make sure the temperature of the coolant is not too high

when draining the cooling system.

Environment

Drained coolant should be treated as environmentally hazardous waste.


Work description


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Draining coolant1. Carefully open the expansion tank cap. The cooling system may be exposed

to overpressure.2. Remove the rubber plug that protects the cooling system’s drain and filler

nipple. The nipple is located under the cab front, see illustration.3. Fit the Adapter for draining the coolant (part number 2 437 252) 2 437 252)

on the hose from the coolant trolley (part number 588 540). Connect the hose to the drain nipple under the cab front. Drain and collect the coolant. If an older trolley design is used it will be also necessary to use Adapter (part num-ber 99 301).

4. Remove the noise shields on the right-hand side of the engine to access the drain nipple on the cylinder block.


Work description


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5. Connect the hose from the coolant trolley, without using the coolant drainage adapter, to the drain nipple on the engine, see illustration. Drain the coolant in the same way as in step 3.


Work description


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For 16 litre engines only:

1. Connect the hose to the connection nipple on the engine to drain the remain-ing coolant from the system, see illustration.

2. Let it run out until completely empty.


Work description


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7 litre engine.

Connect the coolant outlet7 litre enginesMore information on the parts can be found under the heading Part information.

1. Drain the coolant from the system before starting work. More information is found under the heading Draining the coolant.

2. Remove the plug from one of the three connection nipples and replace it with the connection nipple, see illustration. The connections may be in use.

3. Connect the coolant hose to the connection nipple. Secure with a hose clamp.4. Connect the other end of the hose to the intake on the external circuit.5. Ensure that the hose is able to tolerate the movements of the engine (plus/minus

15 mm in all directions).


Work description


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9 and 13 litre engines.

9 and 13 litre enginesMore information on the parts can be found under the heading Part information.


2. Remove the flange pipe from the cooling system intake to the engine, see illus-tration.

3. Fit a new flange pipe with a coolant outlet connection to the external circuit or modify the existing flange pipe. The coolant outlet connection should be posi-tioned in the upper part of the flange pipe, where the coolant leaves the engine.

4. Fit the connection nipple and sealing washer to the flange pipe.5. Connect the coolant hose for the external the circuit to the connection nipple. Se-

cure with a hose clamp.6. Connect the other end of the coolant hose to the intake on the external circuit.

Ensure that the coolant hose is able to tolerate engine movements (plus/minus 15 mm in all directions).


Work description


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1

2

16 litre engine.

16 litre enginesMore information on the parts can be found under the heading Part information.

The following work description applies to the rear left-hand connection point. More information about connection points is found under the heading Coolant outlet loca-tion.


2. Remove the blanking piece (1) located on the rear connection on the left-hand side of the engine, see illustration.

3. Fit a flange and a connection nipple into the flange. If necessary, the connection nipple with flange (2) can change places with the blanking piece (1), see illustra-tion.

4. Connect the coolant hose for the external circuit with an adapter to the connection nipple. Route the hose back through the inside of the chassis frame.

5. Connect the coolant hose to the intake on the external circuit.

Ensure that the coolant hose is able to tolerate engine movements (plus/minus 15 mm in all directions).


Work description


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Coolant return plug. Available on all vehicles.

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Alternative coolant return plug. Available only on vehicles with 16 litre engines and retarder.

Coolant returnThe coolant return plug is located on the pipe downstream of the radiator, see illus-tration. Use connection union (Part number 1 745 705) to connect the coolant hose.

Vehicles with a 16 litre engine and retarder have an alternative coolant return, see il-lustration. In order to connect to the coolant return, the connection union (part num-ber 1 379 383)is used.

IMPORTANT!

The return hose from the external circuit must not be connected to any of the return hoses from the expansion tank or compressor due to the following risks:• Cavitation inside the coolant pump, which may lead to leaks in the pump’s shaft

seal and inadequate flow in the cooling system.• Inadequate flow to the compressor and turbocharger.


Work description


More information on the parts can be found under the heading Part information.

1. Remove the existing plug.2. Replace the seal and fit a connection nipple.3. Connect the return hose from the external circuit to the designated connection

nipple.4. Fill the system with coolant and bleed. Pressure test the system after completion

of the work.

IMPORTANT!

For vehicles with an external circuit, there are special instructions for filling/bleed-ing. These instructions must be followed, otherwise the coolant pump may be dam-aged if the coolant level in the expansion tank drops rapidly.

Information about filling/bleeding for vehicles with an external circuit can be found in the document “Filling coolant”.


Part information


escriptionternal diameter of the hose: mm

Part informationThe following parts can be purchased from a Scania dealer, although other equivalent parts may also be used:

All engines:Designation Part number Appearance DThermostata

a. Thermostat housings are not available from Scania.

2 256 956 In31

Sealing washer for con-necting coolant return and coolant outlet

2 279 232 -

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6 325


Part information


escriptionternal diameter of the hose: mmread: 1/2-14NPTF

ternal diameter of the hose: mmread: M18x1.5



9 and 13 litre engines:Designation Part number Appearance DConnection nipple for coolant outlet, 7 litre en-gines

2 387 241 In18Th

Connection nipple for coolant outlet, 9 and 13 li-tre engines

303 631 In16Th

Connection nipple for coolant outlet, 9 and 13 li-tre engines

1 738 062 In20Th

Connection nipple for con-necting coolant return

1 949 426 In20Th

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2136

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Part information


read: M18x1.5

read: M18x1.5

read: M18x1.5

escription
Flange pipe for diesel en-gines without retarder
2 007 629 Th

Flange pipe for diesel en-gines with retarder

2 007 625 Th

Flange pipe for ethanol/gas engines without re-tarder

2 007 621 Th

Designation Part number Appearance D

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366 3

2940

2 513


Part information


read: M18x1.5escription

Flange pipe for ethanol/gas engines with retarder

2 007 617 ThDesignation Part number Appearance D

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Part information


escriptionread: M22x1.5

l diameter is not relevant.

read: M20x1.5

read: 1/2-14NPTF

16 litre engines:Designation Part number Appearance DFlange 2 178 570 Th

Connection union for coolant outlet, TEMA se-ries 1 800 Na

a. A TEMA coupling means that the hose is not threaded onto a connection nipple and the hose’s interna

1 745 705 Th

Connection union for coolant return, TEMA se-ries 1 800 Na

1 379 383 Th

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Part information


Work toolsThe following work tools can be purchased from a Scania dealer:

Designation Part number AppearanceCoolant trolley 588 135

Coolant filling adapter, TEMA series 1 800 N

2 437 252

Adapter (only for vehicles fit-ted with a retarder), TEMA se-ries 1 800 N

99 301

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978

366 3

3336

6 333


Coolant outlet for external heating General

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