This process is trusted in industries like,

• Marine engines and crankcases
• Power plants and turbine casings
• Pump and compressor housings
• Heavy industrial machinery

Why Not Welding?

Welding large cast components often causes:

• Heat distortion
• Loss of strength due to metallurgical changes
• Crack expansion or new cracks
• Metal stitching avoids heat damage and preserves the original material strength.

How Keys & Locks Work in Metal Stitching

The core of Metal stitching involves installing metal keys (locks) and stitching pins into the crack

Step-by-Step Explanation:

Step 1: Drilling and Stop-Holing

• Small holes are drilled at both ends of the crack.
• This prevents the crack from spreading during the repair.

Step 2: Installing “Locks” (Metal Keys)

• A series of overlapping slots are machined along the length of the crack.
• Technicians insert precision-engineered metal locks (keys) into the slots

Purpose of Keys/Locks:

• They mechanically pull both sides of the crack tightly together.
• They distribute load and stress evenly across the repaired area.
• The locks exceed the strength of the original casting and restore structural integrity

Step 3: Installing Stitching Pins

• Holes are drilled perpendicular to the crack.
• Technicians screw stitching pins into the holes to fill and seal the crack,

Purpose of Stitching Pins:

• They hold the metal in compression.

• They make the repair pressure-tight, preventing leaks of oil, coolant, or gas.

Step 4: Surface Finishing

• The repaired area machined flush.
• After finishing, the repair hides the crack and restores the component to OEM tolerances.

Advantages of Using Keys & Locks in Metal Stitching:

Where This Method Is Used

Metal stitching with keys and locks is commonly used for:

• Cracked diesel engine blocks
• Turbine and pump casings
• Compressor housings
• Marine engine frames and bedplates
• Generator casings

Whether the crack is small or several feet long, the stitching process scales to the size and location of the damage.

Metal stitching using precision metal keys and stitching locks is a reliable, proven, and cost-effective cold repair technique. Unlike welding, it involves zero heat—meaning no distortion, no stress, and no change in material properties. This method restores the structural integrity of cracked cast components and saves industries from huge downtime, dismantling, and replacement costs.

And when it comes to execution, RA Power Solutions is one of the leading global experts in metal stitching and metal locking. With four decades of experience and thousands of successful repairs, we specialize in restoring engine blocks, turbine casings, cylinder liners, compressor housings, and other critical equipment right at the site — anywhere in the world.

For more information on metal stitching repair of engine block cracks, metal stitching crack repair, engine block crack repair, and Crack in Cylinder Liner, please email us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs:

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In case of cracks in cylinder liners, pistons, or cylinder heads in heavy-duty engines, compressors, or turbines there is no need to reject them as now it is possible to repair the crack by a cold process called metal lock and metal stitching. This is a proven procedure of crack repair which has been followed for over 45 years.

We Undertake Crack Repair of the Following Components and Equipment

• Components Manufactured out of Cast Iron, Cast Steel, etc.
• Cylinder Liners, Cylinder Blocks, and Components Have Higher Hardness.
• Piston Manufactured Out of Aluminium
• Bronze Components

RA Power Solutions regularly undertakes repair of main engine components, which develop multiple cracks at different locations and lengths.

The following components were damaged and successfully repaired by the Metal Locking/Metal Stitching process

• In the case of a main engine, Cylinder liners developed multiple cracks from the outer diameter. The cylinder Liner length and inner diameter were 1500 MM and 600 MM respectively. We measured the cracks from 15 mm to 150 mm. RA Power Solutions Pvt Ltd repaired them successfully using the metal locking and metal stitching process. The repairs perform satisfactorily. The photographs below show the team carrying out the work.
• The engine block of the main engine also developed cracks in different locations. These cracks were repaired on board the vessel by Metal Locking and Metal Stitching Process. RA Power Solutions has more than 45 Years of experience in the repair of cracks, developed in the casting of heavy components.

For more information on metal stitching repair of engine block crack, engine block crack repair and Crack in Cylinder Liner please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs:

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The crack repair developed in high-casting components is executed onsite without dismantling the main equipment. RA Power Solutions has developed special alloy keys and locks that have almost ten times more strength than the original casting. Now it is possible to repair the cracks that develop in large, heavy-duty cylinder liners. The cracks repaired are mainly in the non-operational area of the cylinder liners. The repair of cracks in large cylinder liners has become popular, as in most cases, it is not possible to arrange the replacement of the cracked liners with new ones.

RA Power Solutions has saved a number of engines by repairing damaged cylinder liners. Our technicians repair cracks using our metal locking and metal stitching process

We regularly undertake the repair of engine blocks, compressors, and all cast iron, bronze, and aluminum components for the following engine makes:

• Akasaka
• Mitsubishi
• Daihatsu
• Yanmar
• Hanshin
• Kobe Mitsubishi
• Caterpillar
• Wartsila
• Deutz-KHD
• Volvo Penta SKL
• MAK
• Sulzer
• MAN B&W
• SKL
• MTU MAK
• Pielstick

We have been regularly providing metal stitching, metal locking, metal surgery, and repair services in Iraq, Iran, Dubai, Oman, Saudi Arabia, Singapore, Russia, Qatar, Abu Dhabi, Sharjah, Ajman, Umm Al-Quwain, Fujairah, Bahrain, Gambia, Kuwait, Antigua and Barbuda, Belize, Dominica, Dominican Republic, Malaysia, Indonesia, Madagascar, Vietnam, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, South Korea, Saint Vincent and the Grenadines, Trinidad, and Tobago, etc.

For more details on the repair of engine blocks, metal surgery, Crack Repair Of Cylinder Liners and MAN engine cylinder liners, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs:

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Over time, cast iron heads can develop cracks, warping, or other damage due to overheating, stress, or wear. That’s where our expert team steps in. With over 45 years of experience, RA Power Solutions uses advanced metal stitching (metal locking) techniques to restore structural integrity — without the risks associated with welding.

Cast Iron Cylinder Head Repair

At RA Power Solutions, we fix broken engine parts called cylinder heads. Imagine a cylinder head like a cap on a bottle- it keeps everything inside safe. Sometimes, these cylinder heads, made of strong cast iron, can get damaged. That’s where we come in! Our experts at RA Power Solutions know how to mend and make them strong again. We use special tools and skills to fix the cracks and make the cylinder head work like new. So, if your engine’s cylinder head is not feeling well, bring it to us, and we make it healthy again.

Cast Iron Head Repair

Cast Iron Cylinder Head Repair by RA Power Solutions is a service that helps fix broken or damaged cast iron heads, and engine block liners of engines. If the head of your engine is cracked, chipped, or not working properly, RA Power Solutions can help make it as good as new. They use special techniques and skilled experts to mend the cast iron head, ensuring it works well, and your engine runs smoothly. Trust RA Power Solutions for reliable and effective cast iron head repairs by metal lock and metal stitching process.

Our Repair Process Includes:

• Thorough inspection and crack detection
• Cold repair using metal stitching, preserving original metallurgy
• Surface machining and pressure testing
• Reassembly and testing for performance assurance

For more information on Cast Iron Head Repair, Cylinder Head Repair and cylinder heads please email us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs:

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All the repairs executed by us are on-site and without disassembly of the main equipment.

The procedure for metal locking and metal stitching of damaged components, as followed by RA Power Solutions, is as follows:

• A drilling fixture is attached at right angles to the crack. A hole pattern is drilled and repeated at intervals of 3/4 to 1-1/4 inches apart.
• The metal between each drilled hole is removed with the help of pneumatic tools to form a slot. The stock removed is narrower than the drilled hole, thus forming a serrated opening.
• We insert preformed locks of high-tensile alloy into the drilled slot. We peen the locks into the slots one on top of the other in an overlapping pattern. The casting thickness limits the depth, and we determine it by the required strength.
• After the locks are installed, holes are drilled and tapped, and threaded fasteners are applied. These are spotted along the entire length of the crack, overlapping one another. Their purpose, in part, is to fill the fracture with new metal and provide a pressure seal.
• The entire repair area is peened flush and finished ground. Painted if required.

The Metal Locking technique can be used to repair everything from casting faults. The broken machinery and improper machining to intricate items such as marine engines and gears. We can work on a wide array of materials, including work-hardened and heat-treated items.

RA Power Solutions extend Cast Iron Repair, metal stitching/ metal locking services all over the world including countries like Dubai, Oman, Saudi Arabia, Qatar, Abu Dhabi, Sharjah, Ajman, Umm Al-Quwain, and Fujairah, Bahrain, Kuwait, Iraq, Antigua and Barbuda, Belize, Dominica, Dominican Republic, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad, and Tobago, etc.

For more information on metal surgery, metal lock, and metal stitching, contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

FAQs:

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In the past, technicians repaired cracks in cast iron with the traditional welding process. The industry no longer practises this method because welding repairs do not always deliver successful results.

We undertake onsite cast iron repairs and repairs of aluminium and cast steel. All the repairs undertaken by a cold process.

The main advantages are as follows:

Benefits of cast iron repair, aluminium casting, and steel casting repair by metal lock and metal stitching

• Cast iron repair and damage casting repair are possible on site, and there is no requirement to disassemble of damaged component from the main equipment and send it to the designated workshop.
• RA Power Solutions follows the metal stitching and metal locking process to repair cracks in grey iron, steel casting, or aluminium. The process is cold, and it does not generate heat.
• Since the cast iron repair by metal stitching and metal locking is a cold process, there is no loss of alignment or change in the original profile of the component.
• In most cases, there are no need for machining after the damage or crack casting is repaired. This is of great benefit in comparison to the welding process followed by a few companies for crack repair.
• The cast iron crack repair by metal stitching and metal locking process restores to its original strength of the casting and is a watertight and gas-tight repair.
• We execute cast iron crack repairs in minimum time. Our process drastically reduces the downtime of the equipment and the entire plant.

We repair cracks in the casting of grey iron, steel, or aluminium. A few applications mentioned below:

• Repair of cracked engine block, inspection window, liner sitting area in entablature, etc.
• Repair of damaged cylinder liners, pistons, cylinder head, and turbine casing.
• Repair of damaged heavy industrial machinery.
• Repair of damaged gearboxes and pump casings manufactured of Aluminium, cast steel, and grey cast iron.
• We successfully repair all types of cracks in cast iron, aluminium casting, and steel casting.

For more information on cast steel casting, the method of repairing cracks, metal surgery, damaged casting repair in Gambia, and metal stitching, contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

FAQs:

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It was reported that due to an accident, the block of the CO2 compressor was badly damaged and required repair.

Action was taken by RA Power Solutions for the repair of CO2 compressor Block:

Considering the seriousness of the accident, a team of three technicians was deputed. On visual inspection, it was observed that the distance piece housing of the CO2 compressor was badly damaged into pieces. Multiple cracks of different profiles and lengths were also observed on the block of the compressor, the photograph is given below.

Action is Taken for the Metal Stitching & Repair of the Compressor Block

• The damaged area was thoroughly cleaned by the use of special chemicals.
• The paint and red oxide were completely removed.
• The MPI of the damaged area was undertaken by a qualified engineer with a high-intensity magnafux torch.
• Multiple cracks measuring in length ranging from 160 mm to 320 mm were observed.
• The large portion measuring about 8 inches by 6 inches was completely damaged, hence it was decided to completely remove the damaged portion and cast a new piece.
• The area of the housing which was not accessible by the MPI equipment. It was subject to dye penetrant test in order to check the cracks.
• The new piece of casting was placed on the main casing and was metal stitched, as can be seen in the photograph below. The photograph of the new casing piece is also given.
• The remaining cracks were repaired by a metal locking process.
• We used L20 locks and Cast Master pins with a length of 25 mm and a diameter of 8 mm for the metal locking process. The casing had serious damage and multiple cracks.

RA Power Solutions is the only company with forty-five years of experience. The Major repair is by metal locking and metal stitching process.

All our technicians have a valid seaman book, and US VISA . They can fly to any destination in the world in a short time.

Globally Business: RA Power Solutions

We have been regularly executing metal stitching, metal locking, metal surgery & repair services in Iraq, Iran, Dubai, Oman, Saudi Arabia, Qatar, Abu Dhabi, Sharjah, Ajman, Umm Al-Quwain, Fujairah, Bahrain, Kuwait, Antigua and Barbuda, Belize, Dominica, Dominican Republic, Malaysia, Indonesia, Madagascar, Vietnam, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, South Korea, Saint Vincent and the Grenadines, Trinidad, and Tobago, etc.

For more information on engine block stitching, Repair Of Damaged Compressor Block, and turbine casing crack repair on-site, contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs:

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At RA Power Solutions, it is now possible to salvage and save what is otherwise a rejected component or a heavy piece of machinery.

The repair of damaged cast components by traditional welding process is not effective and reliable. In fact, in most cases, due to welding, more damage to the components is reported.

RA Power Solutions has forty-five years of experience in metal stitching, metal locking, and metal surgery

A company well known for extending all over the world for onsite repair of crankshaft and major components has the expertise to repair major and heavy components that are damaged due to accidents. Our clients are from cement plants, power plants, oil rigs, heavy engineering components, etc.

With the experience of forty-five years in the field of repair of damaged components by metal stitching, metal locking, and metal surgery, we are confident to say that the results obtained after repair are almost a hundred percent. All the jobs of metal stitching undertaken by us are guaranteed for satisfactory performance.

In case of an accident, we have the advantage over other companies. All our technicians are trained in metal stitching and metal locking processes. Training is done in our in-house training school based in IMT Manesar, Gurgaon. They have a valid CDC and a U.S. visa. They can fly on any plane or vessel all over the world. Equipment and consumables can be carried as accompanying baggage in a short time.

Thus reducing the breakdown time of a power plant or a vessel.

The main advantage of Cast Iron Repair by Metal Stitching:

• There is no requirement to dismantle the parts and send them to the workshop for repair.
• The metal stitching, metal locking, and metal surgery for crack repair of damaged casting are undertaken onsite. This avoids the high cost associated with disassembly and transportation.
• No heat is generated, which is associated with the welding process.
• Due to the cold process, no distortion of profile takes place, and in most cases, machining is not required.
• The repair area after metal stitching and metal locking is restored to its original strength with air and water fight repairs.
• In some cases, we apply special chemicals after repairs are completed.

We have been regularly executing metal stitching, metal locking, metal surgery & repair services in Iraq, Iran, Dubai, Oman, Saudi Arabia, Qatar, Abu Dhabi, Sharjah, Ajman, Umm Al-Quwain, Fujairah, Bahrain, Kuwait, Antigua and Barbuda, Belize, Dominica, Dominican Republic, Malaysia, Indonesia, Madagascar, Vietnam, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, South Korea, Saint Vincent and the Grenadines, Trinidad, and Tobago, etc.

For more information on Engine Block Stitching and turbine casing crack repair on site, Aluminum Crack Repair, contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs:

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Crack Repair Process For Aluminium | Bronze Components:-

The damaged casting component is visually inspected by our experienced technicians.

It is necessary to remove the paint or red oxide from the crack area of the component. This is done by use of special chemicals.

The Crack Detection Test Of The Cracked Area Is Undertaken By Following Two Methods:-

• MPI test with high-intensity magnaflox torch.
• The crack test is done by in-house experienced technicians who are qualified as level 2 or level 3 technicians.
• Crack detection by conventional dye-penetrant test.

Planning and execution of crack repair by metal stitching and metal locking process:-

Once the area of crack is identified, we undertake the crack repair by metal stitching and metal locking process. This again is undertaken by our experienced technicians.

We have technicians available around the clock. Some of them have over 45 years of experience in undertaking crack repairs of engines, compressor pumps, heavy components, and badly damaged castings.

RA Power Solutions has undertaken hundreds of jobs of damaged casting repair by fixing the new casting piece in place of the damaged area.

Our success rate in repairing cracks and badly damaged castings using the metal lock and metal stitching technique is almost 100%. All crack repair jobs undertaken by us are guaranteed for satisfactory performance. The crack repair of engine components, compressors, and marine equipment can be undertaken on vessels even while sailing.

All technicians have valid Indian CDC and can board the vessel in a short time.

We have been regularly executing the repairs in Benin, Ghana, Burkina Faso, Ivory Coast, Nigeria, Mali, Liberia, Guinea, Niger, Cameroon, Equatorial Guinea, Sierra Leone, Gabon, Guinea-Bissau, Senegal, Gambia etc.

This blog is written by Mr. Raj Shahani (Managing Director of RA Power Solutions India Pvt. Ltd.).

Mr.Shahani is a highly experienced business leader with 45 years of rich experience in the field of Power, Heavy, and Shipping industries. He is a Technical Adviser to many shipping and heavy industries across the globe.

Mr. Shahani is one of the most enthusiastic professionals, and he has all the brilliance of an exemplary leader. He is an extremely effective coach and mentor of teams and is adept at providing leadership in a global, cross-cultural environment.

For more queries on Aluminium Piston Crack Repair, repairing a crack in casting, metal stitching process, crack repair techniques, and repair of a crack in cast iron casting contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

FAQs:

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This process of Onsite Crack Repair Has replaced the old and conventional method of crack repair by welding. Crack repair by metal stitching and locking is becoming popular worldwide.

The main advantages are as follows:-

• In this time of recession, get your equipment repaired successfully on site and avoid replacement.
• In 99% of cases of accidents, crack repair by metal stitching has proved to be successful.
• Can you afford a long breakdown in your plant? No, get your equipment back in service in a few hours.
• A fantastic solution and technological innovation for crack repair without disassembly of the equipment. Repair is possible on-site, metal surgery, even on ships and on the high seas, or at remote heavy engineering plants.
• In most cases, no machining is required, as no heat is generated.
• A pressure-tight seal can be achieved.
• The metal lock and metal stitching process is recognised by the classification societies.

Expertise available with RA Power Solutions for Forty-Five Years:

You cannot trust the repair of your expensive equipment to a company that is not experienced. RA Power Solutions, with 45 years of experience, has technicians who have spent their lifetime successfully repairing the engine and heavy machinery components that have been seriously damaged. The successful repair of cracks and damaged components needs proper planning and execution.

We have been regularly repairing the cracked components of the most popular engine makes like Wartsila, Daihatsu, Mirrless Blackstone, Yanmar, Allen, MAK, MAN, B&W, Sulzer, Caterpillar, etc.

The consumables used by us to undertake the repair by the metal stitching process are of high quality and proven for their satisfactory performance. The effective and proven alloy of MN211 AND MN 555 is used for undertaking the repair by metal stitching.

RA Power Solutions has successfully executed thousands of crack repair jobs all over the world. The cost of repair offered by us is the lowest in the market.

For more information on onsite metal surgery, engine block metal locking, and turbine casing crack repair onsite contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

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