DAF CF65, CF75, CF85 Series . Manual - part 486

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3-3

Inspection and adjustment

XE ENGINE, ENGINE BRAKE

CF65/75/85 series

4

10

Mechanical inspection of DEB

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When the engine is run without the 

valve covers, hot lubricating oil may 

escape from the engine. Make sure 

you are adequately protected.

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When the engine or parts thereof are 

opened, it is possible for dirt to 

penetrate which can result in serious 

damage to the engine. Therefore, the 

engine should be cleaned 

thoroughly before any parts are 

opened.

Note:

If the DEB was removed, the DEB must first be 

switched on and off several times with the engine 

running to bleed the DEB and fill it with lubricating 

oil.

1.

Remove the valve covers.

2.

Start the engine and run it at idling speed.

Note:

When the DEB is mechanically switched on, 

the fuel injection is not switched off. Each 

DEB should therefore be activated for as 

brief a period of time as possible.

3.

Use a small screwdriver to push the pin in the 

centre of the solenoid valve downwards. The 

DEB has now been activated mechanically.

4.

Visually check whether the main and 

operating pistons of the DEB move and/or 

the exhaust valve is opened.

5.

When the DEB is switched off, check 

whether lubricating oil is discharged from the 

control valves.

6.

Fit the valve covers.

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XE ENGINE, ENGINE BRAKE

3-4

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Inspection and adjustment

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CF65/75/85 series

4

3.3 INSPECTION AND ADJUSTMENT, EXHAUST BRAKE

Checking exhaust brake
1.

Use air pressure to check the exhaust brake 

(4) for smooth operation.

This can be done by electrically activating 

the exhaust brake valve (2) or by 

pressurising the exhaust brake cylinder (1) 

yourself.

Setting the exhaust brake
1.

Release the ball head of the butterfly valve 

control lever.

2.

Open the butterfly valve fully (exhaust brake 

inactive), indicated by the mark (1) on the 

butterfly valve shaft.

3.

Set the length of the piston rod (2), making 

sure that without air pressure a pre-load of 1 

to 2 mm is present.

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4-1

Removal and installation

XE ENGINE, ENGINE BRAKE

CF65/75/85 series

4

10

4. REMOVAL AND INSTALLATION

4.1 REMOVAL AND INSTALLATION, DEB

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Make sure that the spring plate (5) 

under the main piston (4) is not 

damaged or deformed. When the 

DEB is in operation, this spring 

plate, if it is damaged or deformed, 

can break off and result in serious 

damage to the engine.

}

When the engine or parts thereof are 

opened, it is possible for dirt to 

penetrate which can result in serious 

damage to the engine. Therefore, the 

engine should be cleaned 

thoroughly before any parts are 

opened.

Removing the DEB
1.

Remove the valve cover.

2.

Disconnect the electrical connection and 

remove the cable harness from its housing.

3.

Remove the DEB.

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Removal and installation

10

CF65/75/85 series

4

Installing the DEB
1.

Tighten the rocker seat attachment bolts to 

the specified torque. See "Technical data".

Note:

There are two different DEB housings, one 

for cylinders 1 to 3 and one for cylinders 4 to 

6 (shown as "front" and "rear" on the DEB 

housing).

2.

Place the DEB on the rocker seats.

3.

Insert the DEB attachment bolts and tighten 

them to the specified torque. See "Technical 

data".

4.

Attach the electrical connection.

5.

Adjust the valve clearance. See "Inspection 

and adjustment".

6.

Adjust the DEB clearance. See "Inspection 

and adjustment".

7.

Fit the valve cover.

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