In our field work, we have seen that the reliability of a marine diesel engine depends as much on the quality of its replacement components as it does on proper maintenance practices. Whether the engine is undergoing a scheduled overhaul during drydock or an emergency repair while the vessel is alongside, every spare must meet the required dimensional tolerances and material specifications.
At RA Power Solutions, marine engine spares and crankpin bearings are our core area of expertise. Along with supplying a comprehensive range of marine engine components, we are specialist manufacturers of crankpin bearings and main journal bearings for two-stroke and four-stroke diesel engines operating worldwide. We manufacture bearings in accordance with OEM drawings or approved samples while maintaining the dimensional accuracy and bearing clearances required for reliable hydrodynamic lubrication.
From our experience during engine overhauls, valve tappets are subjected to continuous cyclic loading and contact stress. Material selection, hardness, and surface finish directly influence service life.
We manufacture mechanical lifters from chilled cast iron and alloy steels, ensuring the specified hardness, cam profile, and surface finish. Each tappet is produced to maintain correct geometry so that valve timing and cam follower contact remain within design limits throughout engine operation.
Exhaust valve failures usually begin with poor metallurgy or improper seat protection. During routine inspections, we often check valve face condition, stem wear, guide clearance, and seat contact before recommending replacement.
Our inlet and exhaust valves are manufactured from materials including:
EN24 (BS817M40), EN52 (BS401S45), 21-4N (BS349S52)
Valve blanks are produced using the metal gathering upset forging process, while bimetallic valves are friction welded. Depending on engine application, treatments including chrome flash on the stem, Stellite on the seat and tip area, and nitriding/tuftriding are provided to improve wear and temperature resistance.
Correct valve guide clearance is essential for maintaining valve alignment and preventing excessive oil consumption.
We manufacture valve guides from correctly specified cast iron that is heat treated for toughness before precision machining. Both inner and outer diameters are maintained within specified tolerances, and the bore finish ensures accurate valve movement and proper fitment.
We also manufacture non-ferrous valve guides using phosphorus bronze and other special alloys where specified by the engine manufacturer.
During cylinder head overhauls, rocker arm wear is commonly observed around the contact surfaces and pivot locations. Proper heat treatment plays a major role in extending service life.
Our rocker arms are manufactured from carbon steel, case hardening steel, or other specified materials using forging and investment casting processes. Chilled surface profiles are also available where required. Heat treatment cycles, hardness, and machining dimensions are carefully controlled to ensure reliable operation.
A rocker shaft operates under continuous oscillating loads, making dimensional accuracy and surface hardness important for long-term performance.
We manufacture rocker shafts from various grades of alloy steel. Induction hardened rocker shafts are also supplied where specified. Shaft dimensions are maintained well within machining tolerances to ensure proper assembly alignment and smooth rocker operation.
In our field work, we have seen that the reliability of a marine diesel engine depends as much on the quality of its replacement components as it does on proper maintenance practices. Whether the engine is undergoing scheduled overhaul during drydock or an emergency repair while the vessel is alongside, every spare must meet the required dimensional tolerances and material specifications.
At RA Power Solutions, marine engine spares and crankpin bearings are our core area of expertise. Along with supplying a comprehensive range of marine engine components, we are specialist manufacturers of crankpin bearings and main journal bearings for two-stroke and four-stroke diesel engines operating worldwide. We manufacture bearings in accordance with OEM drawings or approved samples while maintaining the dimensional accuracy and bearing clearances required for reliable hydrodynamic lubrication.
From our experience during engine overhauls, valve tappets are subjected to continuous cyclic loading and contact stress. Material selection, hardness, and surface finish directly influence service life.
We manufacture mechanical lifters from Chilled Cast Iron and alloy steels, ensuring the specified hardness, cam profile, and surface finish. Each tappet is produced to maintain correct geometry so that valve timing and cam follower contact remain within design limits throughout engine operation.
Exhaust valve failures usually begin with poor metallurgy or improper seat protection. During routine inspections, we often check valve face condition, stem wear, guide clearance, and seat contact before recommending replacement.
Our inlet and exhaust valves are manufactured from materials including:
EN24 (BS817M40), EN52 (BS401S45), 21-4N (BS349S52)
Valve blanks are produced using the metal gathering upset forging process, while bimetallic valves are friction welded. Depending on engine application, treatments including chrome flash on the stem, Stellite on the seat and tip area, and nitriding/tuftriding are provided to improve wear and temperature resistance.
Correct valve guide clearance is essential for maintaining valve alignment and preventing excessive oil consumption.
We manufacture valve guides from correctly specified cast iron that is heat treated for toughness before precision machining. Both inner and outer diameters are maintained within specified tolerances, and the bore finish ensures accurate valve movement and proper fitment.
We also manufacture non-ferrous valve guides using phosphorus bronze and other special alloys where specified by the engine manufacturer.
During cylinder head overhauls, rocker arm wear is commonly observed around the contact surfaces and pivot locations. Proper heat treatment plays a major role in extending service life.
Our rocker arms are manufactured from carbon steel, case hardening steel, or other specified materials using forging and investment casting processes. Chilled surface profiles are also available where required. Heat treatment cycles, hardness, and machining dimensions are carefully controlled to ensure reliable operation.
A rocker shaft operates under continuous oscillating loads, making dimensional accuracy and surface hardness important for long-term performance.
We manufacture rocker shafts from various grades of alloy steel. Induction-hardened rocker shafts are also supplied where specified. Shaft dimensions are maintained well within machining tolerances to ensure proper assembly alignment and smooth rocker operation.
Valve seat inserts operate under high combustion temperatures and repeated impact loading. Material selection depends on engine operating conditions and fuel quality.
We manufacture valve seat inserts using nickel-based, chrome-based, cobalt-based, and iron-based alloys, selected for their wear resistance and heat resistance characteristics.
Cylinder liners directly influence piston ring sealing, oil control, and engine efficiency. During inspections, we closely monitor liner wear, ovality, taper, surface finish, and remaining wear allowance before deciding whether replacement is necessary.
We manufacture cylinder liners using centrifugal castings with controlled metallurgical composition to achieve wear resistance while maintaining effective lubrication characteristics.
Cylinder liners up to a 600 mm bore size have been developed for:
Many auxiliary engine failures originate from worn or damaged pump housings and cast components rather than rotating equipment.
We manufacture cast components, including:
These components are produced using aluminium gravity casting, pressure die casting, and graded cast iron, according to customer drawings or approved samples.
We manufacture a wide range of forged and cast components according to buyer specifications or supplied samples.
Production processes include:
Each manufacturing route is selected according to the mechanical properties and service requirements of the component.
Bearing condition is one of the first areas we assess during crankshaft inspections. Excessive clearance, wiping, fatigue, overheating, or white metal breakdown often indicates lubrication issues or crankshaft geometry outside OEM regrind limits. During crankshaft repair, we always verify journal dimensions, ovality, taper, fillet radius, Ra surface finish, and compatibility with the specified undersized bearing shells before returning the engine to service. Our primary specialization is the manufacture of marine engine spares and crankpin bearings for marine and stationary diesel engines. We manufacture:
We also undertake rebabbitting of bearings and manufacture new white metal (Babbitt) bearings in different grades according to customer drawings or approved samples.Our crankpin bearings are supplied worldwide for marine propulsion engines, auxiliary engines, power plants, and offshore applications where dimensional accuracy and reliable bearing performance are essential.
We also manufacture and supply a wide range of marine engine components, including:
These components are produced according to customer drawings, OEM specifications, or approved samples.
Engine failures do not always occur at convenient locations. In practice, many vessels require replacement parts within limited port stays or repair windows. Having readily available inventory helps reduce downtime until permanent repairs are completed. We maintain a substantial inventory of marine engine spares sourced from ship-breaking yards across India, together with brand-new, used, and reconditioned components for a wide range of marine diesel engines.
Our stock includes major assemblies, such as:
Depending on the repair scope, these components are supplied for planned overhauls, emergency vessel repairs, or power plant maintenance. Where required, dimensional inspection reports can be provided before dispatch, and components intended for classed vessels can be inspected in accordance with applicable DNV, ABS, Lloyd's Register, or other classification society requirements, subject to project specifications.
At RA Power Solutions, we specialize in marine engine spares, crankpin bearings, insitu crankshaft grinding, onsite crankshaft repair, crankshaft grinding machines, metal stitching, metal locking, engine block repair, cast iron crack repair, crankpin polishing, crankshaft inspection, rebabbitting of bearings, and babbitt white metal bearings, delivering reliable engineering solutions to the marine, power generation, and industrial sectors worldwide.
