MTU 8V 2000 C / 8V 2000 G — Repairing threaded bores with threaded inserts (Heli-Coil)
Repair & overhaul
For the MTU 8V 2000 C / 8V 2000 G, from the MTU service manual.
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Before you start
- Use bolt shearer to remove driver journal to M 14; above M 14 remove with pointed pliers
Procedure
- 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 and snout corresponding with thread.
- Align groove on snout with markings on installation tool.
- Insert thread insert into spindle; driver journal must be in groove.
- Turn thread insert through snout until flush at front.
- Mount installation tool on threaded hole and install insert without pressure.
Tools required
- Removal tool Amazon
- Twist drill Amazon
- Special tapped bore Amazon
- Installation tool with spindle and snout Amazon
- Bolt shearer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Insert thread insert 1/2 to 1 1/2 turns deeper than threaded bore surface
- M 6 core hole 6.31/6.04, twist drill 6.1–6.25
- M 10 core hole 10.40/10.05, twist drill 10.25
- M 12 core hole 12.50/12.05, twist drill 12.25–12.5
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.