For over 50 years, Tanna Cranktech Pvt. Ltd. has been a trusted name in the Marine, Industrial, and Oil & Gas sectors, delivering excellence in crankshaft repair, reconditioning, and precision engineering services.
Our team’s unmatched technical expertise and commitment to excellence enable us to minimize downtime, reduce costs, and extend the life of vital components for our clients.
At Tanna Cranktech, we specialize in repairing and restoring major engine and machinery components used in:
- Marine engines & ship machinery
- Land-based power plants
- Diesel engines and compressors
- Oil & Gas mechanical systems
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At Tanna Cranktech we undertake the reconditioning of the heavy-duty , Crankshafts, Cylindrical Shafts, Metal Stitching of several cast iron parts where the welding is not possible / permitted, rebuilding of shafts crankshafts , Line Boring of Engine Blocks, repairing of Cylinder heads, Connecting Rods, boring and Honing of Cylinder Liners, Straightening of Crank Shafts & Cam shafts etc for all Major Diesel engines irrespective of any ,make & capacity worldwide.
○ In-SITU Repairing of the Crankshafts
In cases where the damage in the crankshaft is only in one or few CR pins & all the main journals are ok, economics do not justify the dispatch of the entire CRANKSHAFT to a distant workshop. With the latest edition of the In-situ grinding Machine, a far more flexible solution is offered by TCPL to the customer to repair the damage seized CR pins at the vessels only . We maintain the accuracy in the range of 0.015 to 0.02 mm after the insitu grinding & also the parallelism / taper / ovality are also maintained in the same accuracy range / as per global STD prescribed by OEM .
○ Metal Stitching of the Engine Blocks
Metal stitching is a commercial method of repairing the crack, broken, or burst pieces of cast iron items without application of any heat & as a result of which there is no change/distortion/deformation in the repaired equipment. In the repairing process Locks & Cast master, stitching pins are used. We Import the materials from the USA. The advantages of Metal Stitching are no heat stresses are induced, no distortion occurs. The repair is Gas & Liquid proof & can withstand high pressure & tensional forces & not much machining is required after repairing.
○ Line boring of engine blocks for main journal pockets, liner seating areas, or any equipment with multiple bores in a single line.
The Line Boring of Engine Blocks, Bed Plates, compressor blocks, and gearbox blocks are undertaken by us at site . We are capable of machine two or more bores in a line up to the length of 10 meters with an accuracy level of 0.02mm. We have imported the hydraulic/pneumatic Line Boring equipment which is used for line boring operation. To check the alignment of Bores, an Easy-Laser alignment checking equipment is imported from Sweden, is used. With this laser equipment, alignment of housing bores along “X” & “Y” axis with an accuracy of 0.01mm can be checked.
○ Boring and Honing of Cylinder Liners
The Cylinder Liner boring and Honing is carried out with the machine which is imported by us from a world’s leading company -M/S Chris Marine, Sweden who masters the art of manufacturing of high quality Cylinder Liner boring/honing equipment. The limit of accuracy of re-honed Liners taper/ovality are maintained within 0.02-0.03 mm and the surface finish is controlled within RA1.3-1.6 um & the cross-honing angle is maintained within 45-55 Deg or as per the OEM guide lines / requirement . The machine is portable, so we can undertake the honing operation at the customer’s location .
○ NDT Testing of Engine Components
NDT inspection of the Crank shafts , Engine Blocks , Con Rods , Liners , Cylinder heads , Camshafts & other Engine parts are carried out by our specialized trained Engineers who are level II & III grade . Each Job Inspection is conducted by Engineers who are fully trained and have work experience more than 15 to 20 years in all kinds of inspection work including Magnetic Particle, Ultrasonic, and Dye Penetrant Tests along with Dimensional measurements with highly precise instruments like Laser Equipment, Micrometres, Bore gauges, Dial gauges, Digital verniers, etc which are periodically calibrated as a routine practice for the authenticity of accuracy. A key Management person implements regulates and reviews all quality aspects and production standards . This pre inspection of the damage parts are extremely important to decide the repairing action of the parts or certify them to use “as it is” condition.
○ Connecting - Rod Housing Repair
The company has developed technology to salvage expensive Conrods housings by repairing them in-house for correction of the ovality which develops during operation. Crack testing is done to determine invisible cracks & correction of the dimensional wear. In-housing Boring is done & during this process straightness, Parallelism, and center distance are maintained as per OEM STD during the repairing process so that the accuracy of the repair and finish is achieved as per OEM specifications/tolerances.
○ Rebuilding of Crank Shafts
The Rebuilding of the crankshaft becomes necessary when severe damage or cracks are observed in the crank pins (CR pins) or main journals (MJ), and repair is not feasible using available undersize bearings or for certain diameters where under sizing are not allowed . In such cases, the crankshaft is deemed unserviceable and stands rejected. To salvage these crankshafts, rebuilding is the only viable solution. This process is carried out by us by using fully computerized, imported equipment, ensuring precision and consistency. The rebuilding method employed is a cold process, during which the crankshaft temperature never exceeds 90°C. This ensures that no thermal stress is induced in the crankshaft throughout the repair cycle. This advanced rebuilding technology is particularly suitable for applications where shaft under sizing is not permissible—such as alternator rotor shafts or shafts fitted with roller bearings where no reduction in diameter are permissible & repairing by re building is the only solution .
○ Cylinder Heads Repairing
At works we carry out the repairing of the cylinder heads for replacing the valve seats , valve guides , hydrotesting , de scaling service . We also provide the over size valve seat insertion procedure where the OEM is supply the oversize valve seats .
○ Repairing of Engine Components
Repairing of other Engine components like fuel pumps, oil pumps, injectors etc are also carried our at our warks on case to case basis .
○ Our Production Facilities
Our two plants are located at a distance of 10 and 20 km from the center of the city, Rajkot (Gujarat INDIA) where we undertake the manufacturing of the crankshafts, Piston Rods, crossheads, Mud Pumps & Fuel supply pumps shafts related to large Air Compressors. The factory is built up in a 50,000 sq feet area. Our 3rd plant is located at Taloja, Navi Mumbai with an area of around 15,000 sq. feet & is dedicated for repairing services for the diesel engine parts for our Marine customers to provide them with a better time-bound commitments. The grinding equipment installed in our plants has been imported from M/s. Vereco spa, Italy. It is designed with inbuilt controls for vibration-free operation & microbalance setting that can grind Crankshafts up to 7.5 meters in length and weigh up to 8,000 kg. The entire equipment is tropicalized to ensure trouble-free performance in adverse ambient temperatures. The grinding wheels are imported from Saint-Gobain S.A.(Earlier known as Norton), France/USA, who are world leaders in abrasive technology. The accuracies of these Grinding machines are as per DN standards. Trueness is maintained within 0.01mm. Concentricity is maintained within 0.02mm. Cylindricity is maintained within 0.02mm. Circularity is maintained within 0.02mm. Parallelism is maintained within 0.02mm. Run out of the complete crankshaft is maintained as per OEM recommended limits.
Our Dubai division in the name of Dynamikos Maritime Services L.L.C., Dubai, the subsidiary of Tanna Cranktech Pvt. Ltd., India. Tanna Cranktech has been a trusted name for over 55 years in manufacturing crankshafts for compressor applications , serving the global marine and industrial sector. Through our Dubai office, we are positioned to support clients not only in the UAE but worldwide, with Marine & Oil & Gas Spare Parts Supply Onboard Technical Services for vessels in UAE ports and international locations (subject to port/visa approvals) Specialized Crankshaft Supply and Solutions, backed by our own manufacturing expertise & service teams in India Non-Destructive Testing (NDT) and Third-Party Inspection Services Our strength lies in combining proven manufacturing capabilities with a global supply and service network, ensuring reliability and fast response wherever your vessels operate. Together, Tanna Cranktech and Dynamikos Maritime Services form a single, unified group that offers end-to-end support — from manufacturing and inspection to repair and supply — ensuring reliability, quality, and service wherever our clients operate.
We offer advanced NDT inspection services for engine components, including crankshafts, engine blocks, connecting rods, cylinder heads, liners, and camshafts. Our Level II and III certified NDT engineers ensure precise defect detection, quality assurance, and maximum engine reliability, delivering trusted, high-performance inspection solutions that meet international standards.
Precision NDT Techniques
Employing ultrasonic, magnetic particle, and dye penetrant testing for accurate defect detection.
Certified NDT Experts
Our Level II and III qualified engineers ensure compliance with international inspection standards.
Engine Component Check
Detailed NDT inspection of crankshafts, cylinder heads, liners, camshafts, and engine blocks.
Reliable Quality Control
Delivering precise data-driven evaluations to enhance engine performance, reliability, and safety.
Our clients trust Tanna Cranktech for precision engine components and reliable performance. Expertly crafted crankshafts, camshafts, and NDT‑tested parts ensure maximum efficiency, durability, and satisfaction.
“Precision crankshafts significantly improved our engine reliability. Outstanding workmanship and delivery.”
Rajan Mehta
“The team at Tanna Cranktech handled our custom piston rods with zero tolerance for error, highly professional and efficient team.”
Anita Shah
“Exceptional quality crankshafts with tolerated high loads, maintained balance perfectly and reduced failures.”
Suresh Patel
“Working with Mr. Banerjee was seamless: accurate specifications, on‑time delivery and parts that met our exacting standards.”
Anshul Gupta
“We entrusted Tanna for our liner and rod requirements — their attention to detail and finishing is second to none.”
Vikram Desai