Kohler RD 441, Service Manual

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- 46 - Workshop Manual KD 441_cod. 1.5302.865_2 nd ed_ rev. 01.
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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:
Values measured on the circumference of the flywheel
D = 260
(one degree corresponds to 2.26 mm).
Caution – Warning
After checking set the valve clearance back to the prescribed
one.
Overhauls and checking