Crankshaft Annealing and Hardness Removal

As the market leader in marine crankshaft machining, Goltens encounters many failures which result in areas of excessive hardness every year. Loss of a crankshaft or other rotating shaft due to high hardness values is a costly, time consuming and extremely disruptive occurrence. Goltens provides expert crankshaft failure analysis and heat treatment/annealing around the globe coupled with in-situ machining solutions that minimize downtime.

Oftentimes, this hardness can be machined away by Goltens In-Situ teams. But when the hardness is so severe that cutting it away extends below the manufacturer’s limits for acceptable journal diameter, there are only two options – costly crankshaft replacement or removal of the hardness.

Goltens has demonstrated the effectiveness of the in-situ annealing process and has received Germanischer Lloyd and Lloyds Register Marine Class approvals. Over the decades, Goltens has refined its process for annealing crankshafts and other shafting and can do this successfully In-Situ as well as in our workshops around the world. A deep understanding of the metallurgy, expansion characteristics and safety precautions has been developed and refined over the years into a safe, repeatable, highly controlled process.


Our experience shows that hardness can be successfully removed via heat treatment of crankshafts and that minor finish grinding/cutting can restore the machinery to service with significantly less loss of shaft diameter as well as the avoidance of costly shaft/equipment removal and replacement.

Goltens’ brand has always been synonymous with the repair of diesel crankshafts however, every year Goltens applies this technology to problems in the marine, industrial, stationary power and offshore sectors. Goltens is routinely called upon to repair damaged journals on any and all manner of rotating equipment including compressors, turbines and other shafts and journals.

Goltens’ Annealing and Hardness Removal AdvantagesGoltens’ Annealing and Hardness Removal Advantages

  • Germanischer Lloyd Class approved annealing process
  • Comprehensive capability to handle all aspects of hardness treatment inclusive of engine preparation, Inspection, pre-machining, hardness removal and finish machining as well as engine reassembly
  • A large, global team of highly skilled In-Situ technicians to ensure a rapid, expert response anytime and anywhere
  • Deep experience successfully annealing crankshafts across a broad array of makes and models of engines and rotating machinery
  • Globally deployed and available portable annealing equipment for In-Situ application

    Problems Most Often Observed/Addressed with Crankshaft and Journal AnnealingProblems Most Often Observed/Addressed with Crankshaft and Journal Annealing

    • Bearing Failure / Bearing Meltdown resulting in areas in the journal surface with excessive hardness values

      Partial List of Diesel Crankshafts that Goltens has successfully annealed

      • BERGEN 9L32:40
      • BERGEN B32:40L8P
      • BERGEN B32:40L9P
      • BERGEN B35:40V12AG
      • BERGEN B35:40V16AG
      • BERGEN BRM8
      • BERGEN BV33:45
      • BERGEN C25:33L8P
      • BERGEN C25:33L9P
      • BERGEN KVGS18G4.2
      • BERGEN KVG16
      • BERGEN KVG18
      • COLT PIELSTICK 10PC4.2V
      • COLT PIELSTICK PC2.5
      • DAIHATSU 5DK-20
      • DEUTZ 5BV8M698
      • DEUTZ 6SVM640
      • DEUTZ SBV 6M 540
      • DEUTZ 12M640
      • DEUTZ TBD645 L9
      • GMT 420.12
      • IHI PIELSTICK 12VPC2
      • MAK 16CM32
      • MAK 453
      • MAK 551
      • MAK 552
      • MAK 6M20
      • MAK 6M32
      • MAK 6M43
      • MAK 6M453
      • MAK 6M552C
      • MAK 8M20
      • MAK 8M25
      • MAK 8M32
      • MAK 8M552
      • MAK 8M601
      • MAK 9M32
      • MAN B&W 10V52/55
      • MAN B&W 12V28/32
      • MAN B&W 12V48/60
      • MAN B&W 12V52/55
      • MAN B&W 16U28LH-4
      • MAN B&W 16V40/54
      • MAN B&W 18V40/45
      • MAN B&W 18V40/54A
      • MAN B&W 5L23/30
      • MAN B&W 5L28/32
      • MAN B&W 6L23/30
      • MAN B&W 6L28/32
      • MAN B&W 6L40/54
      • MAN B&W 6L48/60
      • MAN B&W 6S50MC-C
      • MAN B&W 7L27/38
      • MAN B&W 7L28/32
      • MAN B&W 7L32/40
      • MAN B&W 7L40/45
      • MAN B&W 7L48/60D
      • MAN B&W 7S35MC
      • MAN B&W 8L23/30
      • MAN B&W 8L27/38
      • MAN B&W 8L28/32
      • MAN B&W 8L32/40
      • MAN B&W 8L40/54
      • MAN B&W 9L58/64
      • MAN B&W 9L28/32H
      • MAN B&W 9L32/40
      • MAN B&W 9L40/54
      • MAN B&W V9V40/54
      • MIRRLEES BLACKSTONE 16KVMajorMKII
      • MIRRLEES BLACKSTONE ESL6MA
      • MIRRLEES BLACKSTONE K6MajorMKIII
      • MIRRLEES BLACKSTONE K8Major
      • MITSUBISHI 18KU30
      • MITSUBISHI MAN 14V40/45A
      • MITSUBISHI MAN V9V40-54
      • MITSUBISHI MHI16KU
      • NIIGATA 16V32CLX
      • NIIGATA 32CX
      • PIELSTICK 12PC2
      • PIELSTICK 12PC4
      • PIELSTICK 14VPC4
      • PIELSTICK 16PC2.5V
      • RUSTON 12RK270
      • RUSTON 6RKCM-H
      • SKL VDS26/20
      • SULZER 12ZAV40S
      • SULZER 12ZV40/48
      • SULZER 14ZAV40S
      • SULZER 16VZA40
      • SULZER 18ZAV40S
      • SULZER 6AL25/30
      • SULZER 6ZA40S
      • SULZER 8S20
      • SULZER 8ZAL40
      • SULZER 9ZA50S
      • SWD / WARTSILA 16VSW280
      • SWD / WARTSILA 6TM410
      • SWD / WARTSILA 8L280
      • SWD / WARTSILA 8TM410
      • SWD / WARTSILA 8TM620
      • WARTSILA 12V46
      • WARTSILA 16V46
      • WARTSILA 18V26
      • WARTSILA 18V32
      • WARTSILA 18V38
      • WARTSILA 18V46
      • WARTSILA 20V32
      • WARTSILA 20V50DF
      • WARTSILA 6L32
      • WARTSILA 6L46A
      • WARTSILA 6L46C
      • WARTSILA 9L46B
      • WARTSILA 9V32