Valve Timing - Angles - Kohler RD 441 Service Manual

5
Overhauls and checking
100
- 46 -

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.
Workshop Manual KD 441_cod. 1.5302.865_2
nd
ed_ rev. 01.