Two Different Engines, Two Different Buying Logics
MAN B&W's range splits into slow-speed crosshead two-strokes (MC, MC-C, ME) and medium/high-speed four-stroke auxiliaries (L16/24, L23/30, L27/38, L32/40). The failure modes barely overlap, so neither should be bought on generic "good condition" assurances. Our MAN B&W brand desk handles both families; the notes below are what its inspectors actually check.
MC / MC-C Two-Stroke: Where the Money Goes Wrong
- Piston crowns: hot-corrosion burning of the crown edge and ring-groove wear. Measure groove clearance — re-machining to oversize is routine, but a crown already at final oversize is a display piece.
- Cylinder liners: scuffing in the upper third from poor cylinder lubrication. Honing marks should be visible and even; a polished band at TDC means the liner is done.
- Exhaust valve spindles: Nimonic spindles suffer seat denting from cat-fines in HFO. Look for the "cobblestone" pattern; spindles with deep seating marks rarely recondition economically.
- Fuel injection pump plungers and barrels: lapped surfaces — any visible scoring, reject. There is no cheap fix for a scored barrel.
L-Series Auxiliaries: Smaller Parts, Same Discipline
On L23/30 and L32/40 units, crankshafts and cylinder heads move fastest through our warehouse. Current rotating stock includes the 8L28/32H crankshaft, 7L32/40 crankshaft, 6L28/32H cylinder heads and the complete 9L32/40 engine. Each crankshaft ships with journal readings and MPI reports — the same acceptance routine described in our crankshaft verification guide.
Model Coverage That Matters
Our deepest coverage sits on the 6L28/32H, L32/40 and 8L32/40H platforms, with crosshead spares (liners, crowns, valve spindles) sourced per enquiry from MC-series donor engines. If your manual lists a part number, quote it in your first message via the contact page — it cuts a week of back-and-forth down to a day. For the full MC vs Sulzer comparison, see MAN B&W vs Sulzer two-stroke parts compared.
