DAF LF45, LF55 Series. Manual - part 164

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3.2 CHECKING AND ADJUSTING TIMING GEAR

Note:

The engine is fitted with gears on either side. The 

gears at the vibration damper end only drive the 

oil pump. These gears have no marks and may 

be fitted in any position.

The timing gear wheels on the flywheel side drive 

the camshaft, air compressor and fuel pump. 

Only the camshaft gear and the crankshaft gear 

have marks which must be aligned. The other 

gears may be fitted randomly.

1.

Remove the engine encapsulation panels.

2.

Remove the gearbox.

3.

Remove the flywheel. See "Removing and 

installing".

4.

Remove the flywheel housing. See 

"Removing and installing".

Note:

When the engine crankshaft or camshaft is 

turned separately, the pistons and valves 

may touch each other.

5.

Use an open-end spanner on the fan shaft to 

turn the crankshaft clockwise, as seen from 

the vibration damper end, until the marks in 

the crankshaft gear and camshaft gear 

match. The crankshaft gear has a punched 

hole in the tooth which has to fall into the 

tooth depth of the camshaft gear marked 

with a punched hole.

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6.

Check that the marked tooth falls exactly into 

the marked depth. If not, remove and refit the 

camshaft gear. See "Removing and 

installing".

7.

Fit the flywheel housing. See "Removing and 

installing".

8.

Fit the flywheel. See "Removing and 

installing".

9.

Fit the gearbox.

10. Fit the engine encapsulation panels.

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3.3 CHECKING PISTON PROJECTION

Note:

The piston projection determines which thickness 

of cylinder head gasket must be used.

1.

Use an open-end spanner on the fan shaft to 

turn the crankshaft, so that the piston of 

cylinder 1 is in the top dead centre (TDC).

2.

Clean the upper surface of the cylinder block 

and the pistons.

3.

Place a dial gauge on the upper surface of 

the cylinder block next to cylinder 1 and set 

the gauge to zero.

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4.

Pull up the stylus of the dial gauge and move 

it to the edge of the first piston, above the 

gudgeon pin.

5.

Use an open-end spanner on the fan shaft to 

turn the crankshaft anti-clockwise and 

clockwise, at the same time reading the dial 

gauge to find the highest position of the 

piston. Make a note of this reading.

6.

Repeat this measurement for the other 

pistons.

7.

Calculate the average value of the piston 

projection above the cylinders.

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