MTU 12V 1600 R50 — Valve clearance - Check and adjustment
Adjustments · Valve drive
For the MTU 12V 1600 R50, from the MTU operator's manual.
Applies to: MTU 12V1600R50 engine
Before you start
- Engine is stopped and starting disabled
Procedure
- Engine stopped and starting disabled; coolant temperature max 40 C.
- Remove cylinder head cover and flywheel housing cover, A side.
- Rotate crankshaft with barring gear until OT-A1 mark and pointer aligned.
- Check valve clearance in two crankshaft positions (firing TDC and overlap TDC of A1).
- Use feeler gage between valve bridge and rocker arm.
- If deviation exceeds 0.1 mm, adjust valve clearance.
- Loosen locknut, readjust adjusting screw until feeler gage just passes.
- Tighten locknut M10x1 to 43 Nm +4 Nm; install covers.
Tools required
- Feeler gage Y20010128 Amazon
- Torque wrench 20-100 Nm F30026582 Amazon
- Box wrench 14 mm F30028346 Amazon
- Allen key 5 mm F30002815 Amazon
- Barring gear F6790714 / F67907 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Inlet 0.3 +/- 0.05 mm cold
- Exhaust 0.6 +/- 0.05 mm cold
- Locknut M10x1 43 Nm +4 Nm
Source: MTU operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.