MAN B&W maintenance RFQs need exact evidence
MAN B&W model-family names can appear in main-engine, auxiliary-engine and generator-set RFQs, but the family name alone does not confirm a spare part. Mark version, serial/build information, installed configuration and the applicable manual or part-book reference can change the required component and documentation route.
This guide explains how engineers, technical buyers and purchasing teams can structure maintenance spare parts evidence for supplier review. It does not replace maker instructions, the vessel's Planned Maintenance System, class or flag requirements, or an operator-approved spares policy.
Two-Stroke Engine Families: MC and ME-C Series
Two-stroke RFQs may reference MC/MC-C or ME/ME-C/ME-B families, including designations such as S50MC-C, S60MC-C, S70MC-C or S80ME-C. Include the complete designation and Mark version exactly as shown in the approved vessel documentation.
Electronically controlled configurations can add control, hydraulic and sensor evidence to the request. Do not infer compatibility from a neighbouring model designation; include the installed component plate, drawing or part-book page and any required software or control-system reference.
Four-Stroke Engine Families: L-Series and MaK
Four-stroke and MaK RFQs may reference families such as L28/32H, L23/30H, L16/24, M32C, M43C or M20. State whether the installed unit serves propulsion, auxiliary or generator duty and provide the serial/build evidence needed to identify the correct arrangement.
Evidence needed for a maintenance RFQ
Maintenance scope and intervals must come from the exact engine instruction manual, the vessel's current PMS, maker service information and applicable class or flag requirements. Vessel Core does not publish substitute intervals, wear limits or maintenance instructions. Use the table below as an RFQ evidence checklist.
Evidence rule: attach only the relevant manual or PMS extract and redact unrelated vessel or commercial information. Condition records help identify the request, but technical acceptance remains with the buyer, vessel management, maker and class as applicable.
| Component | System | Task reference | Condition evidence | RFQ evidence |
|---|---|---|---|---|
| Piston Rings | Combustion | PMS / manual task | Measurements + photos | Part number, ring position, quantity, engine Mark and drawing reference |
| Cylinder Liner | Combustion | PMS / manual task | Approved gauge record | Part number or drawing, engine Mark, material and documentation needs |
| Exhaust Valve | Gas exchange | PMS / manual task | Photos + inspection record | Spindle, seat or complete assembly identity and required certificates |
| Fuel Injection Pump | Fuel system | PMS / manual task | Test / condition record | Pump type, element identity, part number and installed arrangement |
| Fuel Injector (Nozzle) | Fuel system | PMS / manual task | Approved test record | Injector and nozzle identity, quantity and documentation requirements |
| Main Bearings | Crankshaft | PMS / class task | Approved measurement record | Bearing position, shell marking, drawing and class documentation needs |
| Crosshead Bearings | Running gear | PMS / manual task | Photos + measurement record | Bearing position, shell marking, drawing and approval requirements |
| Turbocharger | Air/gas system | PMS / maker task | Rating plate + inspection record | Complete turbocharger type, serial, specification and requested component |
| Stuffing Box Seals | Crankcase | PMS / manual task | Installed-part evidence | Seal-set or ring identity, drawing reference and quantity |
| Cylinder Cover Gaskets | Combustion | PMS / manual task | Cover + seal evidence | Complete gasket list, part references, quantity and engine Mark |
| Air Cooler (Charge Air) | Air/gas system | PMS / manual task | Plate + condition record | Cooler identity, element drawing, dimensions and material requirements |
| HCU Seals (ME-C only) | Hydraulic system | PMS / maker task | HCU + control evidence | Engine Mark, HCU identity, installed revision and required documentation |
For four-stroke auxiliary engines, include the exact PMS task, model and serial/build evidence, component identity and the approved scope. Do not transfer an interval, wear limit or parts list from another model family or installation.
Component groups that may appear in an RFQ
The requested component set varies by engine family, Mark version, installed arrangement and approved maintenance scope. The lists below are RFQ indexing aids, not compatibility tables or prescribed overhaul lists. Confirm every line against the vessel's approved documentation.
S50MC-C · S60MC-C · S70MC-C · S80MC-C
- Piston crown with crown bolts and locking wire
- Piston rod with piston rod packing (stuffing box)
- Piston ring sets (compression + oil scraper rings)
- Cylinder liner with drawing and material requirements
- Cylinder cover with cooling bore plugs
- Exhaust valve spindle with material and certificate requirements
- Exhaust valve seat (bottom piece)
- Exhaust valve cage, air spring, and bellows
- Fuel injection pump element (plunger and barrel)
- Fuel injection pump delivery valve and spring
- Fuel injector nozzle (multi-hole spray tip)
- Fuel injector holder and high-pressure pipe
- Crosshead pin and bearing shells
- Crankpin (connecting rod) bearing shells
- Main bearing shells (upper and lower)
- Turbocharger nozzle ring with complete turbocharger identity
- Turbocharger bearing cartridge kit
- Camshaft bearing shells and chain tensioner
- Cylinder cover O-ring and sealing ring sets
- Fuel pump block O-rings and high-pressure seals
G80ME-C · S90ME-C · S60ME-C · S50ME-B
- HCU (Hydraulic Cylinder Unit) — pressure pipe seal kits
- HCU proportional control valve and position sensor
- Exhaust valve actuator — hydraulic piston and rod seals
- Exhaust valve FIVA (Fuel Injection and Valve Actuation) valve
- Electronic fuel injection valve (injector assembly)
- High-pressure fuel booster — piston ring and barrel
- Alpha Lubricator — proportional valve and check valves
- Servo oil pump — relief valve and gasket kit
- Cylinder liner with exact ME-family drawing evidence
- Piston ring sets with installed specification evidence
- Exhaust valve spindle and seat with material requirements
- Crosshead and crankpin bearing shells
- Turbocharger cartridge and nozzle ring
- ECS sensor kit — speed, pressure, temperature sensors
- Cylinder cover sealing ring and O-ring sets
L28/32H · L23/30H · L16/24
- Cylinder head (complete with valve inserts)
- Inlet and exhaust valves, valve guides, and valve springs
- Cylinder head gasket and O-ring set
- Cylinder liner (wet type) with O-ring and anti-polishing ring
- Piston with piston rings (compression and oil control)
- Piston pin and circlips
- Connecting rod with big-end bearing shells
- Main bearing shells (upper and lower)
- Fuel injection pump element and delivery valve
- Fuel injector nozzle holder and spray tip
- Turbocharger cartridge with complete type and serial evidence
- Intercooler element and O-ring set
- Governor drive shaft and actuator seals
- Crankshaft seal (front and rear) and housing gasket
- Full engine gasket and O-ring overhaul kit
M20 · M25 · M32C · M43C
- Cylinder head with approved drawing and insert requirements
- Cylinder head stud bolt set and nut kit
- Cylinder liner with anti-polishing ring
- Piston with pin and circlips
- Piston ring set (compression and oil scraper)
- Connecting rod big-end and small-end bearing shells
- Main bearing shells
- Fuel injection pump plunger and barrel
- Fuel injector complete assembly
- Turbocharger nozzle ring and cartridge
- Valve seat inserts with approved material requirements
- Valve guides (inlet and exhaust)
- Charge air cooler element and O-ring seal kit
- Camshaft bearing shells
- Full overhaul gasket and seal kit
OEM vs Alternative Spare Parts
The RFQ should state whether an OEM route is required, whether a verified alternative may be reviewed, and which technical, warranty, class and documentation approvals apply. Vessel Core can structure route options but does not make the vessel's technical acceptance decision.
Evidence for an OEM route
- State the maker route required by the buyer, warranty or approved repair plan
- List the certificates, traceability or class documents required with the quotation
- Provide exact part numbers, drawings and supersession evidence where available
- Identify control-system, software or revision dependencies
- Confirm who holds final technical and commercial approval
Evidence for alternative review
- Confirm that the buyer permits a verified alternative review for the exact line item
- State required material, dimensional, traceability and test documentation
- Provide the installed part evidence needed for a like-for-like comparison
- Identify warranty, class, flag or maker-approval constraints
- Keep final technical acceptance with the buyer's authorised reviewer
Quality Assurance for Alternative Parts
For an alternative route, define the required traceability, material, dimensional, test and inspection documents at RFQ stage. Requirements differ by component and approval context; do not assume that one certificate set is sufficient for every item.
Vessel Core reviews the proposed route and available documentation against the RFQ. Any required class, maker, flag or operator acceptance should be defined and confirmed by the buyer before order placement.
Approved onboard spares list and time-critical RFQs
Onboard spares must be selected from the vessel-specific approved list, current PMS, maker documentation, class or flag requirements and the operator's own criticality assessment. The groups below help organise an RFQ; they do not prescribe what a vessel must carry or in what quantity.
Cylinder & Piston Spares
- Piston ring sets identified by engine Mark and ring position
- Stuffing box assemblies or approved repair kits
- Piston rod packing rings with drawing evidence
- Cylinder cover O-ring and sealing-ring kits
- Cylinder-liner cooling-water seal sets
Injection Equipment
- Complete fuel injector assemblies with exact identity
- Fuel injection pump elements with pump evidence
- Delivery valves and springs with part references
- High-pressure fuel pipes with drawing and dimensions
- Fuel-pump O-ring and seal kits
Exhaust Valve Parts
- Exhaust valve spindles with material requirements
- Exhaust valve seats or bottom pieces
- Exhaust valve air-spring and bellows components
- Exhaust valve cage O-ring kits
- Exhaust valve actuator seal kits where applicable
Bearings & Fasteners
- Crankpin bearing shells identified by position and marking
- Crosshead bearing shells with drawing evidence
- Main bearing shells with upper/lower identity
- Connecting-rod fasteners only against approved part evidence
- Crosshead retaining components where listed in the approved scope
TC Emergency Spares
- Turbocharger bearing kits with complete type and serial evidence
- Nozzle rings with drawing or part reference
- Bypass valves where fitted and identified
- Air-filter elements with dimensions or part reference
- Mounting gasket sets for the identified arrangement
Electronic Engine Spares
- HCU high-pressure seal kits with installed revision evidence
- FIVA valves with control-system and part identity
- Lubricator proportional valves with installed evidence
- ECS sensors with exact type and revision
- Servo-oil pump valves with pump and drawing evidence
Time-critical MAN B&W breakdown RFQ route
When a main engine breakdown creates a time-critical commercial situation, the RFQ needs a clearer route than a normal replenishment request. Vessel Core reviews time-critical MAN B&W breakdown RFQs around part identification, availability checks, documentation needs and freight context after receipt of a clearly marked time-critical request.
For time-critical parts, provide the following at RFQ stage: vessel name and current position or next port, engine model and serial number, component description with photograph if available, and the port where the vessel can receive parts. Freight options and customs documentation are reviewed during quotation based on part availability, route feasibility and buyer requirements.
How to Order MAN B&W Parts from Vessel Core
Vessel Core uses a structured marine spare parts supply process for purchasing teams and technical superintendents. Clear evidence reduces avoidable clarification and supports a quotation that states the reviewed supply route, available documentation, commercial terms and delivery context.
Prepare Your Parts List
Compile a list of required items with MAN part numbers where available. If part numbers are unavailable, provide the engine model designation (e.g. 6S60ME-C Mk9.5), component description, quantity, and a photograph of the installed part or model plate if helpful. Drawings or relevant pages from the instruction manual are also accepted.
Include Vessel & Engine Details
Provide the vessel name and IMO number, engine type and serial number from approved vessel records or the engine nameplate, and the relevant PMS or manual task reference. State vessel flag, class context and any survey-attendance or documentation requirement that affects the requested route.
Specify Delivery Requirements
State the required delivery port and your vessel's estimated time of arrival (ETA). For pre-positioned supply at a hub port, give the port name and your agent's contact. For ship-to-ship or offshore delivery, note this at RFQ stage so freight options can be assessed. Indicate whether the requirement is standard planned maintenance or a time-critical breakdown situation.
State OEM or Alternative Preference
Indicate whether you require MAN PrimeServ OEM parts, are open to a verified alternative supply route, or would like pricing for both options. If class survey documentation or OEM certification is required for the repair, state this clearly. We will confirm supply route and available documentation before confirming the order.
Submit & Receive Quotation
Send your RFQ by email to sales@vesselcore.eu or use the RFQ form. The resulting quotation, when a route is available, identifies pricing, stated lead time, delivery context and available documentation. For time-critical requirements, mark the subject clearly and include vessel, port and ETA context.
Cross-links: For general MAN spare parts information including model coverage, see the MAN Spare Parts page. For coverage across all engine brands including Wärtsilä, Caterpillar, and Daihatsu, visit the Marine Engine Spare Parts overview. Regional supply pages are available for Finland and Norway.
