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Workshop Manual KD 441_cod. 1.5302.865_2
nd
ed_ rev. 01.
100
5
Valve timing - Angles
Angle values are measured by turning the crankshaft clockwise.
S = Piston at top dead centre
I = Piston at bottom dead centre
α = Intake valve opening
β = Intake valve closing
γ = Exhaust valve opening
δ = Exhaust valve closing
Operating valve timing angles with prescribed valve clearance
α = 21° before S
β = 58° after I
γ = 80° before I
δ = 33° after S
Timing valve angles for checking
To check the timing valve angles set the valve clearance to 0 (zero);
measure the angles achieved when the valve lift is 2 mm.
α = 20° after S corresponding to 45 mm
β = 17° after I corresponding to 38.5 mm
γ = 26° before I corresponding to 59 mm
δ = 20° before di S corresponding to 45 mm
Note: ValuesmeasuredonthecircumferenceoftheywheelD = 260
(one degree corresponds to 2.26 mm).
Caution – Warning
After checking set the valve clearance back to the prescribed
one.
Overhauls and checking
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