Vintage car
crankshaft repair

What needs to be repaired on a crankshaft? In the field of classic car repair, the answer is almost always the same: because crankshafts wear out almost exclusively in the area of the bearing seats.

They are made of a similar, and to a large extent even identical, material to the camshaft. They have an elastic, flexible core and the surfaces are hardened. The hardened layer here is about 0.2 – 0.3 mm.

What we can do at TM Classic Cars:

We re-armour the highly stressed bearing seats with a wear-resistant material using a laser. To be 100% sure, we check our work afterwards by means of dye penetrant testing (non-destructive material testing, also called red-white testing). In this way we can make visible and close even the finest surface cracks, should they still exist. If desired, we can then restore the dimensional accuracy of the bearing seats by grinding.


  • Run-in bearing shells of a crankshaft

What we can do:

A metallurgically highly interesting repair:

In our classic car workshop, we have succeeded in developing a unique method of coating the bearing shells of the crankshaft with white metal.

Bearing shells repair crankshaft_coating with white metal
Vintage Rolls Royce_Bearing Shells Crankshaft Repair
Picture examples:
  • Vintage Rolls Royce, 1927


  • Run-in crank pin of a crankshaft

What we can do:

Coating with specially adapted, abrasion-resistant material using the laser welding process. Without any distortion.

Crankshaft Repair_TM Classic Cars
Picture example:
  • Oldtimer: Condition of our work before sanding.


  • Broken-in crankshaft lifting web

What we can do:

The sealing surface of the Simmerring had shrunk. Rebuild by laser by 0.2 mm.

Afterwards, it could be reground to 100ths and the sealing could be exactly restored.

Crankshaft repair_Oldtimer BMW_Hubwange
Welding crankshaft_stroke cheek Oldtimer BMW
Picture examples:
  • Classic car BMW


  • Crack at a bearing point of the crankshaft

What we can do:

The crack on one bearing of the crankshaft was localised, the depth of the crack checked and ground out accordingly.

Subsequent filling with adapted additional material, renewed crack inspection (professional dye penetrant inspection) and final grinding.

Picture examples:
  • Above: Vintage car, welding a crack on a bearing of a crankshaft

  • Below: Result of our professional dye penetration test (red/white test)

Kurbelwelle reparieren_Oldtimer
Schweißnaht bei einer Kurbelwelle_Oldtimer Reparatur
Riss an einer Lagerstelle der Kurbelwelle_Oldtimer
Rot-Weiß-Prüfung auf Dichtigkeit_Oldtimer Reparatur

+49 (0)234 479924-14


TM Lasertechnik e. K.
Hüttenstrasse 16
44795 Bochum-Weitmar