Valve Clearance: Adjustments

CHECKING AND ADJUSTING VALVE CLEARANCE

Note: Valve clearance is always checked and adjusted on a cold engine and with an ambient temperature of approx. 20 °C.






Clearance is checked by inserting a feeler gauge between shaft end surface and cap of valve adjusting screw.

Valve clearance of cold engine:
Intake valve 0.1 mm
Exhaust valve 0.1 mm

Make adjustments in sequence of firing order (1-6-2-4-3-5). Piston of pertinent cylinder must be at TDC of compression stroke, since both valves will then be closed. TDC mark of each cylinder is made on pulley.

Cylinder Designation:

Adjusting






1. Remove hot air ducts between fan and heat exchangers as well as cover for camshaft housing.
2. If adjustments are started with cylinder no.1 turn crankshaft on pulley clockwise until both valves of cylinder are closed (valves of cylinder no.4 overlap) and TDC mark (Z1) on pulley is aligned with joint of crankcase or stripe on fan housing.






3. Check valve clearance with P 213. If necessary, loosen nut on adjusting screw and correct valve clearance by turning adjusting screw with a suitable screwdriver. Hold adjusting screw and tighten nut.
4. Recheck clearance.
5. Now turn crankshaft on pulley to next mark (120°). Valves of cylinder no.6 can be adjusted in this position.
6. Turning crankshaft (120°) to next mark brings the valves of cylinder no.2 into position.
7. Repeat procedures accordingly for adjustment of remaining valves (cylinder nos. 4, 3 and 5).