MTU 20V4000M93 series Operating Instructions Manual page 152

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 138).
2. Install cylinder head covers (→ Page 151).
150 | Valve Drive | MS150048/05E 2018-03
Size Type
M16x1.5 Tightening torque
Lubricant Value/Standard
(Engine oil) 90 Nm +9 Nm