In situ crankshaft machining ALCO engine Archives - Crankshaft Grinding Repair Sat, 04 Apr 2026 10:04:30 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 Locomotive | Engine YDM4 ALCO 251 | Crankshaft Repair https://www.crankshaftgrindingrepair.com/locomotive-engine-ydm4-alco-251-crankshaft-repair/ https://www.crankshaftgrindingrepair.com/locomotive-engine-ydm4-alco-251-crankshaft-repair/#respond Sat, 04 Apr 2026 07:43:14 +0000 https://www.crankshaftgrindingrepair.com/?p=3679 Locomotive engines are still in operation in a few countries. We were approached by a client based in Malaysia regarding a problem faced by them in the crankshaft of Locomotive YDM4 ALCO 251. This engine is of an old design and is compact. After studying the crankshaft and engine block design, RA Power Solutions prepared […]

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]]> Locomotive engines are still in operation in a few countries. We were approached by a client based in Malaysia regarding a problem faced by them in the crankshaft of Locomotive YDM4 ALCO 251. This engine is of an old design and is compact. After studying the crankshaft and engine block design, RA Power Solutions prepared dedicated tooling capable of grinding and polishing the crankpin of YDM4 ALCO 251 without removing the crankshaft from the engine block.

The standard diameter of the crankpin is only 152.00 mm, and the bearing width is 75.00 mm.

 

Damaged Crankpin of Crankshaft of Locomotive Engine YDM4 ALCO 251
Damaged Crankpin of Crankshaft of Locomotive Engine YDM4 ALCO 251

 

Crankpin Surface with Deep Scoring Lines – YDM4 ALCO 251 Engine
Crankpin Surface with Deep Scoring Lines – YDM4 ALCO 251 Engine

 

The details are as follows:

S. No. Crankpin Details
1 Engine Make Locomotive
2 Engine Model YDM4 ALCO 251
3 Crankpin Diameter Standard 152.00 MM
4 Crankpin Bearing Width 75.00 MM
5 Grinding of Crankpin Number #03
6 Place of Execution of Grinding of Crankpin Selangor Darul Ehsan,Malaysia
7 Name of Shipping Company Reputed Company from Malaysia
8 Date Of Execution 25.03.2026 to 03.04.2026

 

MPI Test of damaged Crankpin of locomotive engine YDM4 ALCO 251
MPI Test of damaged Crankpin of locomotive engine YDM4 ALCO 251

 

Hardness Test of Crankpin of Locomotive Engine YDM4 ALCO 251
Hardness Test of Crankpin of Locomotive Engine YDM4 ALCO 251

 

The damaged crankpin was calibrated, and excessive ovality was observed. All other parameters were found to be within limits. RA Power Solutions successfully executed the grinding and polishing of the crankpin using a portable onsite crankshaft grinding machine without removing the crankshaft from the engine block. Despite the complicated and limited inspection window opening, the repair was successfully completed; consequently, the crankpin was undersized by 2.00 mm to effectively correct the high ovality and restore proper geometry.

 

In-Situ Machining of Crankshaft Crankpin – YDM4 ALCO 251 Engine
In-Situ Machining of Crankshaft Crankpin – YDM4 ALCO 251 Engine

 

Onsite Machining of Crankshaft Crankpin #03 – YDM4 ALCO 251 Engine
Onsite Machining of Crankshaft Crankpin #03 – YDM4 ALCO 251 Engine

Onsite Crankshaft Grinding Services with Global Reach and Proven Performance

RA Power Solutions offers onsite crankshaft grinding and repair services under a wide range of conditions; whether operating on a ship at sea, at a power plant, or even at a cement plant in a remote location, the company ensures reliable and efficient solutions. As a result, this global reach ensures a quick response and, furthermore, delivers reliable solutions anywhere.Despite the complicated and limited inspection window opening, our technicians successfully completed the repair; consequently, they undersized the crankpin by 2.00 mm to effectively correct the high ovality and restore proper geometry. Furthermore, RA Power Solutions guarantees that its crankshaft grinding services ensure satisfactory performance of the crankshaft and diesel engine after repairs.

 

Crankpin Grinding Operation in Progress of Locomotive Engine YDM4 ALCO 251
Crankpin Grinding Operation in Progress of Locomotive Engine YDM4 ALCO 251

 

Onsite Crankshaft Grinding Without Removal of Locomotive Engine YDM4 ALCO 251
Onsite Crankshaft Grinding Without Removal of Locomotive Engine YDM4 ALCO 251

Global Expertise in Locomotive Engine Crankshaft Repair Services

With the ability to deploy skilled technicians worldwide, crankshaft repair services are available across multiple industries, including railways, marine, and power plants. As a result, this global reach ensures a quick response and, furthermore, delivers reliable solutions anywhere.

Moreover, our advanced in-situ crankshaft grinding offers significant advantages, including reduced repair time, substantial cost savings, and the complete elimination of engine removal. As a result, this technique enables efficient onsite repairs while consistently maintaining OEM standards.

Damaged crankpin after grinding and polishing
Damaged crankpin after grinding and polishing

 

Locomotive Engine YDM4 ALCO 251 Crankpin after polishing
Locomotive Engine YDM4 ALCO 251 Crankpin after polishing

 

For more information on onsite crankshaft repair, grinding of crankshaft, and crankshaft polishing, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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