Product range — actual catalogue images
The product images below are hosted on the manufacturer's official website (linlancorp.com) and link directly to the manufacturer's catalogue. Click any image to view the full specification page in a new tab.
Marine diesel engine cylinder block — large-bore casting for ship main engines and auxiliary diesels.
Marine engine cylinder head — multi-valve casting with integrated fuel injector and valve seats.
Valve cover for marine diesel engines — sealed casting protecting valve train.
Large piston rings for marine engines — heavy-section compression and oil-control rings for slow-speed and medium-speed diesels.
Marine engine categories and parts demand
| Engine type | Typical bore × stroke | Power range | Common applications | Aftermarket parts demand |
|---|---|---|---|---|
| Slow-speed two-stroke (low RPM) | 500-980mm bore × 1500-3500mm stroke | 2-90 MW | Container ships, bulk carriers, tankers — main propulsion | Cylinder liners, piston crowns, rings, fuel injection equipment |
| Medium-speed four-stroke | 200-460mm bore × 250-600mm stroke | 0.5-25 MW | Auxiliary generators, smaller vessel propulsion, ferries | Cylinder heads, valves, pistons, turbochargers |
| High-speed four-stroke | 120-220mm bore × 130-280mm stroke | 0.1-5 MW | Tugs, fishing vessels, fast craft, emergency generators | Complete engine spares, frequent rebuilds |
| Very high-speed (small craft) | 80-160mm bore × 90-180mm stroke | 50-1000 kW | Small commercial, recreational, RIBs, lifeboats | High-volume consumer-style aftermarket |
Spare parts categories
| Part category | Typical replacement interval | FOB China typical price (medium-speed engine) |
|---|---|---|
| Cylinder liners | 10,000-30,000 hours / major overhaul | USD 1,800-12,000 each (depends on bore) |
| Piston crowns / pistons | 10,000-25,000 hours | USD 1,200-9,500 each |
| Piston rings (set per cylinder) | 5,000-15,000 hours | USD 250-2,400 per set |
| Cylinder heads | 15,000-40,000 hours / major overhaul | USD 2,800-18,000 each |
| Valve covers | Long life / replace if cracked | USD 350-1,800 each |
| Inlet and exhaust valves | 5,000-15,000 hours | USD 180-650 each |
| Valve seats and guides | 15,000-30,000 hours | USD 80-280 each |
| Connecting rods / bolts | 30,000+ hours / inspect during overhaul | USD 850-4,500 each (rod), USD 65-220 each (bolt set) |
| Main and big-end bearings | 15,000-25,000 hours | USD 320-2,200 per set |
| Crankshafts | 40,000+ hours / lifetime if not overstressed | USD 18,000-95,000 each (medium-speed) |
| Camshafts and segments | 20,000-40,000 hours | USD 1,200-8,500 each (segment) |
| Fuel injectors | 4,000-12,000 hours | USD 380-2,400 each |
| Fuel injection pumps | 15,000-30,000 hours | USD 1,800-9,800 each |
| Turbocharger CHRA / cartridge | 15,000-30,000 hours | USD 4,500-22,000 each |
| Gaskets, seals, O-rings (kit) | Each overhaul | USD 280-2,800 per kit |
Engine families and aftermarket cross-reference
For commercial vessels regulated under SOLAS (Safety of Life at Sea), engine spare parts in critical applications (main engine cylinder components, propulsion-system bearings, fuel injection equipment) may require class society approval. The major class societies are: ABS (American Bureau of Shipping), DNV (Det Norske Veritas), Lloyd's Register (LR), BV (Bureau Veritas), CCS (China Classification Society), KR (Korean Register), NK (Nippon Kaiji Kyokai), RINA (Italian classification). Each maintains type-approval programs for marine spare parts.
For non-class-critical parts (gaskets, seals, valve covers, accessories, fuel filters), commercial-grade aftermarket parts are generally acceptable. For class-critical parts, two paths: (1) Source from class-approved supplier with documented approval certificates; (2) Source aftermarket-fit and obtain individual approval per part per class society — typically requires significant testing and documentation. Reputable suppliers like Linlan Corp can provide class society approval documentation for relevant product categories. Verify class approval scope matches specific vessel's class society and intended part application before procurement.
| OEM family | Typical engines covered | Aftermarket-fit availability |
|---|---|---|
| MAN B&W (slow-speed) | S-series, K-series, L-series, G-series two-stroke | Wide aftermarket-fit availability for major wear parts |
| MAN (medium-speed) | L+V series 28/32, 32/40, 32/44, 48/60 | Wide aftermarket-fit availability |
| Wärtsilä / Sulzer | RT-series two-stroke; W20, W26, W32, W34, W38, W46 four-stroke | Strong aftermarket-fit market |
| Mitsubishi (UE) | UEC and UEX two-stroke; S series four-stroke | Limited aftermarket availability for newer engines |
| Daihatsu | DK, DC, DCE-series medium-speed | Moderate aftermarket availability |
| Yanmar Marine | UE-X, KE, EYM-series | Strong domestic Asia aftermarket |
| Hyundai HiMSEN | H21, H25, H32 series medium-speed | Growing aftermarket availability |
| MTU / Detroit Diesel | Series 4000, 8000 high-speed | Moderate aftermarket availability |
| Cummins Marine | QSK, QSM, QSB series | Strong consumer-style aftermarket |
| Caterpillar Marine | 3500, 3600, C-series | Wide aftermarket availability |
| Pielstick / SEMT | PA-series, PC-series medium-speed | Specialty aftermarket |
| Niigata / Hanshin / Akasaka | Various Japanese medium-speed | Domestic Asia aftermarket |
Materials and manufacturing
| Component | Typical material | Manufacturing process |
|---|---|---|
| Cylinder block / cylinder head | Cast iron (GG-25 / GG-40 / GGG-50 ductile iron) | Sand casting + heat treatment + machining |
| Cylinder liner | Cast iron with chrome-plated wear surface | Centrifugal casting + chrome plating + honing |
| Piston (medium-speed) | Aluminum-silicon alloy (low-RPM); composite forged steel + aluminum | Forging + machining |
| Piston (slow-speed two-stroke) | Cast steel piston crown + cast iron skirt | Forging + casting + machining |
| Piston rings | Cast iron (compression); chrome-plated cast iron (top compression) | Centrifugal casting + grinding + chrome plating |
| Connecting rods | Forged steel (typical 42CrMo4 / SCM440) | Forging + heat treatment + machining |
| Crankshaft (medium-speed) | Forged steel (typical 42CrMo4 / SCM440) | Forging + induction hardening + machining |
| Camshaft | Forged steel + induction-hardened lobes | Forging + machining + induction hardening |
| Valves (inlet) | Heat-resistant steel (typical 21-4N) | Forging + machining + tip-induction hardening |
| Valves (exhaust) | Stellite-faced heat-resistant alloy (typical Inconel-base) | Forging + Stellite welding + machining |
| Valve seat inserts | High-chrome cast iron or sintered alloy | Casting / sintering + grinding |
| Bearings (main + big-end) | Steel-back tri-metal bearing | Multi-layer rolling + machining |
Order workflow — marine engine spares procurement
- Engine identification — exact engine model, serial number, build year; for slow-speed engines, also cylinder count and stroke variant; this drives part-number specification
- Part specification — OEM part number cross-reference, dimensional drawings if available, material specification, surface treatment specification
- Class approval requirement — verify if part is class-critical for vessel's class society; obtain approval documentation before committing if required
- Sample / prototype order — for non-emergency procurement, sample part for dimensional and material verification; test fit before committing to larger order
- Production order — typical order quantity 1-10 of larger components, 10-50 of smaller wear parts; lead time 30-90 days depending on complexity
- Material certification — request material test certificates (chemical analysis, mechanical properties); for class-critical parts, type-approval certificate
- Quality acceptance — incoming inspection (dimensional, hardness, surface finish); for major castings, NDT (non-destructive testing) per relevant procedure (UT for forgings, MT for cast iron, PT for surface defects)
- Installation and commissioning — for major parts (crankshafts, cylinder blocks), supervise installation per OEM procedure; document installation parameters for warranty purposes
- Service tracking — record installation date, running hours, performance for future analysis; aftermarket-fit parts often have similar service life to OEM but tracking is essential
Pricing brackets — aftermarket marine engine spares
Critical context: marine engine OEM spare parts pricing has historically been 3-6× the cost of equivalent automotive engine parts, reflecting low volume, specialty engineering, and captive customer base. Aftermarket-fit parts typically priced at 30-50% of OEM list price, delivering meaningful operating cost savings to ship operators. For class-critical parts, the savings vs OEM may be smaller (15-30%) due to type-approval testing costs.
View the full supplier profile, certifications, contact details, and complete product catalogue.
Linlan Corp (China) — manufacturer of aftermarket-fit marine engine spare parts. Cylinder blocks (cast iron GG-25 / GG-40 / GGG-50 ductile iron); cylinder heads (multi-valve castings with integrated injector and valve seats); valve covers; pistons (aluminum-silicon for medium-speed; cast steel crown + cast iron skirt for slow-speed two-stroke); piston rings (cast iron compression and oil-control, chrome-plated top compression); connecting rods (forged 42CrMo4 / SCM440 with rod bolts); crankshafts (forged steel with induction-hardened journals); camshafts (forged steel with induction-hardened lobes); inlet valves (heat-resistant 21-4N steel); exhaust valves (Stellite-faced Inconel-base); valve seats and guides (high-chrome cast iron or sintered alloy); main and big-end bearings (steel-back tri-metal); fuel injectors and fuel injection pumps; turbocharger CHRA cartridges; complete gasket and seal kits. Cross-reference to MAN B&W, Wärtsilä, Sulzer, Mitsubishi, Daihatsu, Yanmar, Hyundai HiMSEN, MTU, Cummins Marine, Caterpillar Marine, Pielstick / SEMT, and Japanese orphan engines (Niigata, Hanshin, Akasaka). Class society documentation available for relevant product categories.
| Order tier | Buyer type | Discount vs OEM equivalent | Lead time |
|---|---|---|---|
| Single ship maintenance | Single vessel routine maintenance | 40-60% below OEM list | 30-60 days |
| Ship management company | Fleet operator routine procurement | 45-65% below OEM list | 40-75 days |
| Major fleet operator | Container line, tanker company, bulk operator | 50-70% below OEM list with framework agreement | 45-90 days |
| Shipyard project order | Major repair / drydocking | 50-65% below OEM list | 60-120 days for major components |
| Aftermarket dealer | Independent ship-supply distributor | 55-75% below OEM list at distributor cost | 45-90 days |
Frequently asked questions
Companion guide for marine industrial sourcing — hydraulic systems on the same vessels.
Companion marine sourcing guide for deck-mounted hardware and fittings.
Companion sourcing guide for diesel engine consumables — filters used alongside engine spare parts.
Source: Product images on this page are hosted on the manufacturer's official website (linlancorp.com) and link directly back to that website. All product information was summarised from the supplier's public catalogue.
Brand mentions and trademark compliance: References to OEM marine engine manufacturer brands (MAN B&W, Wärtsilä, Sulzer, Mitsubishi, Daihatsu, Yanmar, Hyundai HiMSEN, MTU, Detroit Diesel, Cummins Marine, Caterpillar Marine, Pielstick, SEMT, Niigata, Hanshin, Akasaka) are made for the sole purpose of describing engine families and aftermarket-fit cross-reference. Linlan Corp is not authorized by, affiliated with, or endorsed by any of these brand owners. Products are aftermarket-fit cross-reference parts manufactured under Linlan Corp's own brand for cross-reference fitment to the engine families described.
Class society approval: Marine engine spare parts in critical applications on SOLAS-regulated vessels may require class society approval (ABS, DNV, Lloyd's Register, BV, CCS, KR, NK, RINA). Verify approval requirements with vessel's class society before procurement. Installing non-approved parts in class-critical applications can void class certification and create regulatory issues.
Marine safety and operational responsibility: Marine engine spare parts directly affect vessel propulsion and life-safety systems. Improperly specified or installed parts can cause engine failure leading to dead-ship situations, fires, or marine casualties. Engineering review and qualified installation technicians are essential for major component replacement.
Pricing & specifications: All price ranges, service-life figures, and discount estimates reflect general market observation. Real-world parts pricing depends on engine type, part complexity, current market conditions, and order volume. Service life figures represent typical performance under normal operating conditions and may vary significantly with fuel quality, load profile, and maintenance practices. Confirm current pricing, lead time, and certifications directly with the supplier.
No middleman role: CifyChina provides supplier discovery and editorial content. All transactions occur directly between buyer and supplier through the contact channels published on the supplier's official website.
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