MTU 20 V 4000 C22 Operations Instructions download pdf (Page 75)

Checking valve clearance at two

crankshaft positions

1. Check TDC position of piston in cylinder

A1:

• If the rocker arms are unloaded on cylin‐

der A1, the piston is in firing TDC.

• If the rocker arms are loaded on cylinder

A1, the piston is in overlap TDC.

2. Check valve clearance with cold engine:

• Inlet valves (long rocker arm) = 0.2 mm

• Exhaust valves (short rocker arm) =

0.5 mm

3. Check all valve clearances at two crank‐

shaft positions (firing and overlap TDC for

cylinder A1) as per diagram.

4. Use feeler gauge to determine the distance

between valve bridge and rocker arm.

5. If the deviation from the reference value ex‐

ceeds 0.1 mm, adjust valve clearance.

Adjusting valve clearance

1. Release locknut (1).

2. Insert feeler gauge between valve bridge

and rocker arm.

3. Using Allen key, set adjusting screw (2) so

that the specified valve clearance is provid‐

ed.

4. Feeler gauge must just pass through the

gap.

5. Tighten locknut (1) to 90 +9 Nm, holding

adjusting screw (2) firm.

6. Replace or rectify adjusting screws and/or

locknuts which do not move freely.

7. Check valve clearance.

Final steps

1. Remove barring tool (→ Page 56).

2. Install cylinder head cover (→ Page 76).

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MTU 20 V 4000 C22 Operations Instructions Page 75