MTU 12 V 2000 M72 Operations Instructions download pdf (Page 81)

7.5 Valve Drive

7.5.1 Valve clearance – Check and adjustment

Preconditions

☑ Engine is stopped and starting disabled.

☑ Engine coolant temperature is max. 40 °C.

☑ Valves are closed.

Special tools, Material, Spare parts

Designation / Use Part No. Qty.

Feeler gauge

Y4345893 1

Barring tool

F6783914 1

Ratchet

F30006212 1

Double box wrench

F30002800 1

Angular screw driver

F30002816 1

Socket wrench

F30030450 1

Torque wrench, 10-60 Nm

F30510423 1

Preparatory steps

1. Remove air filter (→ Page 99).

2. Remove cylinder head cover (→ Page 84).

Positioning A1 piston at TDC

1. Remove cable from sensor B13 (→ Page 27).

2. Remove sensor B13.

3. Using ratchet and barring tool, rotate crankshaft in engine direction of rotation until the marking on the

flywheel is aligned with the center of the sensor seat.

Checking valve clearance at two crankshaft positions

1. Check TDC position of piston in cylinder A1:

• If the rocker arms are unloaded on cylinder 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 (E) = 0.3 mm;

• Exhaust (A) = 0.4 mm.

3. Check all valve clearances at two crankshaft positions (firing TDC and overlap TDC) according to the

table below.

8V2000

Position Cylinder 1 2 3 4 5 6 7 8 9

Firing TDC in cylinder A1 Bank A E A - A E - - A

Bank B E - E - - - - A

Overlap TDC in cylinder A1 Bank A - - E - - A E -

Bank B - A - A E A E -

“E” = inlet valve clearance adjustment permitted, “A” = exhaust valve clearance adjustment permitted

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MTU 12 V 2000 M72 Operations Instructions Page 81

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