MTU 12V4000M73 series Operating Instructions Manual page 183

Adjusting valve clearance
1. Release locknut (1).
2. Insert valve setting gauge (3) between valve
bridge and rocker arm.
Note: Replace or rectify adjusting screws and/or
locknuts which do not move freely.
3. Using angular screw driver, set adjusting
screw (2) so that the specified valve clear-
ance is provided.
Note: Valve setting gauge must just pass through
the gap.
4. Pass valve setting gauge (3) between valve
bridge and rocker arm.
5. Tighten locknut (1) to specified torque using a torque wrench, holding the adjusting screw (2) in place to
prevent it from turning.
Name
Locknut
6. Check valve clearance, adjust as necessary.
Final steps
1. Remove barring tool (→ Page 168).
2. Install cylinder head covers (→ Page 182).
Size Type
M16x1.5 Tightening torque
Lubricant
(Engine oil)
MS150045/03E 2018-08 | Valve Drive | 181
Value/Standard
90 Nm +9 Nm