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:

The post Metal Stitching and the Use of Keys & Locks in Crack Repair appeared first on Metal Stitching and Metal Locking Services | RA Power Solutions.

We undertake the repair of the damaged and cracked engine block by metal stitching and metal locking process, the advantage of which is as follows.

Repair Of Cracked And Damaged Engine Block By Metal Stitching And Metal Lock Process:-

The repair by metal lock and metal stitching technique is a proven method. It is used for repairing damaged engine blocks, turbo casings, cylinder liners, pistons, and other major spares of diesel engines and heavy mechanical equipment.

The area of the crack must be identified and marked. We undertake crack detection by MPI and the dye-penetrant method, depending on the thickness of the casting. When necessary, we perform metal stitching on both sides of the damaged area. We provided that there is sufficient space for the approach of our pneumatic tools.

RA Power Solutions uses high-quality metal keys, metal locks, and consumables. Combined with the expertise of our experienced technicians, this ensures successful repairs through metal stitching and metal locking.

We have been regularly undertaking repair of engine blocks, compressors, turbochargers, and all cast iron, bronze, and aluminium for the following makes of engines:-

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

We have been regularly executing the repairs in Argentina, Bahamas, Barbados, Bermuda, Bolivia, Brazil, Canada, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guatemala, Guyana, Haiti, Honduras, Jamaica, Mexico, Nicaragua, etc.

Mr. Shahani is a highly experienced business leader with 45 years of rich experience in the field of Power, Heavy, and Shipping industry. 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. Mr. Shahani is an extremely effective coach and mentor of teams and is adept at providing leadership in a global, cross-cultural environment.

For more information on metal locking a cracked engine block, cracked engine block repair, repair of damaged engine block, metal stitching technique, or cracked and damaged engine block, contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at 9582647131 or 9810012383.

FAQs:

The post Cracked Engine Block Repair By Metal Stitching | Metal Lock | RA Power Solutions appeared first on Metal Stitching and Metal Locking Services | RA Power Solutions.