Checking Timing Belt Rating; Valve Adjustments - Kohler Lombardini LDW FOCS 502 Euro 2 Service Manual

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6.4 CHECKING TIMING BELT RATING

6.4.1 Valve adjustments

1. Bring the piston to the compression top dead centre.
2. Adjust the screw (A) and the lock nut in order to adjust
the rocker arm valve clearance to 2 mm.
3. Rotate the crankshaft clockwise through 360° in order
to make the piston reaching the balancing top dead
centre.
4. Apply a magnetic goniometer on the crankshaft pulley
and set it to zero.
5. Place two dial indicators on the collars of the intake
and exhaust valves, then set them to zero.
6. Rotate the crankshaft clockwise until the dial indicator
moves away from zero.
7. Measure the rotation angle of the crankshaft by using
the magnetic goniometer.
The value registered indicates when the intake valve
starts opening.
8. Go on rotating the crankshaft clockwise until the dial
indicator stops at point "0".
9. Measure the rotation angle of the crankshaft by using
the magnetic goniometer.
The value registered indicates when the intake valve
starts closing.
The values registered must coincide with those
indicated on the timing angle diagrams (see
"Distribution timing angle diagram").
10. Repeat these procedures on the other valves.
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OVERHAULS AND TUNING
goniometer
Service Manual LDW FOCS 502 automotive _ cod. ED0053027270 - 3° ed_rev. 02
Fan drive pulley
magnetic
A
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Intake
Exhaust
valve
valve
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