Technical data

Valve Gear 6–11

1 Cylinder A1 is in firing TDC

2 Cylinder A1 is in overlap TDC

I Inlet valve

X Exhaust valve

Adjusting valve clearance in two crankshaft

positions

1. Check TDC position of piston in cylinder A1:

• If the rocker arms are not under load on

cylinder A, the piston is in firing TDC.

• If the rocker arms are under load on cylinder A,

thepistonisinoverlapTDC.

2. Check valve clearance w ith cold engine:

• Inlet = 0.4 mm;

• Exhaust = 0.6 mm;

3. Check all valve clearances in two crankshaft

positions (firing and overlap TDC for cylinder

A1) as per diagram.

4. Use feeler gauge to determine the distance

etween valve bridge and rocker arm.

5. If the deviation from the reference value exceeds

0.1 mm, adjust valve clearance.

Valve clearance adjustment

1. Loosen locknut (1) and unscrew adjusting screw

(2) by a few threads.

2. Insert feeler gauge between valve bridge and

rocker arm.

3. Readjust adjusting screw (2) so that the feeler

gauge just passes through the gap.

4. Tighten locknut (1) to 50 Nm, holding adjusting

screw (2) firmly.

5. Check if the feeler gauge just passes through

between valve bridge and rocker arm.

sult: If not, adjust valve clearance.