MTU 12V 2000 M / 16V 2000 M — Repairing threaded bores with threaded inserts (Heli-Coil)
Repair & overhaul · Crankcase threaded bores
For the MTU 12V 2000 M / 16V 2000 M, from the MTU service manual.
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Before you start
- Do not countersink bore!
- Do not apply pressure to spindle during installation
Procedure
- If necessary, remove thread insert with suitable removal tool from bore.
- Bore core hole with suitable twist drill – see table.
- Cut thread with special tapped bore. Do not countersink bore!
- Mount spindle (2) and snout (1) of corresponding thread; groove on snout must be aligned with markings on installation tool (arrows).
- Insert thread insert (2) into spindle (1) in installation tool; driver journal of thread insert must be in groove (arrow).
- Use spindle to turn thread insert through snout until it is flush at front (arrow).
- Mount installation tool on threaded hole and install thread insert without applying pressure to spindle; insert thread insert 1/2 to 1 1/2 turns deeper than threaded bore surface.
- Use bolt shearer to remove driver journal to M 14; for threaded inserts over M 14, move driver journal up and down with pointed pliers and remove.
Tools required
- removal tool Amazon
- twist drill Amazon
- special tap Amazon
- installation tool Amazon
- spindle Amazon
- snout Amazon
- bolt shearer Amazon
- pointed pliers Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Tightening tolerance +10 % of specified torque if no tolerance stated
- Angle of rotation tolerance +5° for angle ≤ 90°, +10° for angle > 90°
Source: MTU service 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.