Camshaft Timing; Valve Timing Without Considering Timing Marks; Valve Timing Check - Kohler KD 625/3 Workshop Manual

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Disassembly / Reassembly
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Camshaft timing

Fit camshaft gear by making timing mark 2 coincide with timing marks
1.
Tighten camshaft bolt at 250 Nm.


Valve timing without considering timing marks

Locate piston 1 (on flywheeI side) at the top dead center. Position two
small cylinders A of the same height onto the tappets.
Rotate camshaft stopping when cylinder 1 tappets are in overlap posi-
tion (intake open, exhaust closed).
By means of ruler B check that tappets are at the same height.

Valve timing check

Check using an index plate suitable for reading angles, integral with
the crankshaft. Readings are taken in degrees.
Set valve clearance at 0,65 ÷ 0,70 mm (after checking restore the va-
lue al 0,15 ÷ 0,20 mm). Set dial gauge on intake valve to a zero value;
by rotating the driving shaft according to its direction of rotation you
can measure α (intake valve opening advance referred to top dead
centre PMS) and ß (intake valve closing delay referred to bottom 1
dead centre).
Follow the same procedure for exhaust valves checking γ (exhaust
valve opening advance) and δ (exhaust valve closing delay).
KD Workshop Manual_cod. ED0053029350_1° ed_ rev. 00