MTU 12V4000G34F Operating Instructions Manual page 122

2. Turn measuring unit screws (1) into the threads and tighten to specified torque using a torque wrench.
Name
Screw
3. Set all dial gages to 0.
4. Unscrew measuring unit (2) from calibration plate (3).
Step 1: Measure valve protrusion at the valve head with measuring jig 1
1. Check TDC position of piston in cylinder A1:
• If rocker arms on cylinder A1 are unloaded, the piston is in firing TDC.
• If rocker arms on cylinder A1 are loaded, the piston is in overlap TDC.
2. Measure valve protrusion for each valve in two crankshaft positions (firing TDC and overlap TDC) according
to the diagram. Diagram (→ Page 126).
3. Place measuring unit 1 (2) on the cylinder
head (3).
4. Turn measuring unit screws (1) into the threads provided for the cylinder head cover and tighten to specified
torque using a torque wrench.
Name
Screw
5. Determine the values with all dial gages.
• The valve protrusion value must be ≤ 1.5 mm.
• If the value is > 1.5 mm, measure with a depth gauge or optionally with measuring jig 2.
6. Unscrew measuring unit (2) from cylinder head (3).
Step 2: Measure valve protrusion at the valve stem with a depth gauge
1. Check TDC position of piston in cylinder A1:
• If rocker arms on cylinder A1 are unloaded, the piston is in firing TDC.
• If rocker arms on cylinder A1 are loaded, the piston is in overlap TDC.
2. Measure valve protrusion for each valve in two crankshaft positions (firing TDC and overlap TDC) according
to the diagram. Diagram (→ Page 126).
122 | Valve Drive | MS15060/01E 2018-12
Size Type
M10 Tightening torque
Size Type
M10 Tightening torque
Lubricant Value/Standard
20 Nm
Lubricant Value/Standard
20 Nm