Reverse Engineering

GLMW has the engineering and machinery capabilities required to duplicate products through reverse engineering. If you are looking for a unique product that is not listed in our product range, please contact us.


GLMW manufactures crankshafts up to 4000 mm long and to a maximum weight of 3 tons for diesel, gas, dual-fuel and biogas engines; and for units from 4 cylinders up to 24 cylinder. We have an intense manufacturing process for our crankshafts as they are mainly provided to heavy industries where their strength and durability is vital. We use both closed and open die forging techniques. We are capable of manufacturing crankshafts up to 5 meters in length and 3.000 kilograms in weight. All manufacturing processes are handled in Europe and North America. 

Forging: Press-forging consists of three progressive stages during which the material is essentially pushed into shape: The nose and tail are formed to create the front and rear main bearing areas. In the process of pressing the center bearing areas into shape, a wedge of material is created that is pushed into the counterweight areas of the die. We can manufacture crankshafts via closed die, open die and continuous grain flow forging.

Hardening: Once the crankshaft has been tempered and machined, the surface is hardened via induction hardening. This heat treatment process is specifically adapted to the different elements in the steel composition and how they interact with each other. The crankshaft is heated to about 2,600 degrees F, then dipped in heated glycol. As the steel is control-shocked, all elements establish a grain structure. The units are heat-treated for core hardness.

Machining: GLMW can machine large crankshafts up to a length of 5m and 300 mm stroke. We use fully automated mill turns and lathes to ensure perfect machining and grinding processes.

Pistons and Cylinder liners

GLMW manufactures pistons and liners up to 350mm diameter for diesel, gas, biogas and dual-fuel powered engines. Each step of the manufacturing process is designed to meet stringent OEM production standards. We currently produce 90 different types of pistons and liners for various engine applications. Additionally, the company manufactures supplementary products such as pins & retainers. We are capable of manufacturing special design pins incorporating 3 sequential processes with fully automated grinding line and lapping facilities. We use centrifugal casting to cast our liners, which is the most common and far superior liner casting method compared to basic static casting.

Valve Kit

GLMW manufactures a variety of valves, guides and seats for gas, diesel, dual fuel and biogas engines. We offer valves and the supplementary products for OE, OES and aftermarket use.

Connecting Rod

GLMW manufactures connecting rods up to 1500 mm long and a maximum weight of 560 kg for diesel, gas, dual-fuel and biogas engines. We offer con-rods mainly for large bore engines.

Quality control

Every single piston, cylinder liner and related product must proceed through the following quality control stages:

  • Material chemical analysis
  • Casting microstructure
  • Universal hardness 
  • Microhardness 
  • Hardness depth control 
  • Ultrasonic Alpine screening test 
  • 100% visual inspection
  • 100% precision dimension controls with CMM machines
  • Additionally, a roundness test, surface roughness, digital height, volume and coordinate measurements are all performed in our laboratory.