
MaK · M20 · M25 · M32 · M43 · Four-stroke
Genuine, OEM and reconditioned spares for MaK-MaK four-stroke main engines — the MaK M-series, the common-rail M-series / M43 and the MaK M-series — sourced beside Alang, shipped to India, UAE, Singapore & worldwide.
A century of diesel
Maschinenbau Kiel (MaK) is founded in Kiel, Germany.
MaK builds its medium-speed M-series four-stroke marine engines.
The M20, M25, M32 and M43 become global standards for ship propulsion and power.
MaK joins Caterpillar — sold as Cat / MaK medium-speed engines.
Wattmare keeps every MaK M-series engine running with genuine, OEM-equivalent and Alang-reconditioned spares.
Who is MaK
MaK (Maschinenbau Kiel), now Caterpillar Motoren of Germany, builds the M20, M25, M32 and M43 medium-speed four-stroke marine engines for propulsion, auxiliary and power-generation duty.
A single fleet can run the compact M20 / M25, the workhorse M32, or the high-output M43 — and Wattmare supplies genuine, OEM-equivalent and Alang-reconditioned spares across every MaK bore.

Engine series we cover
Mechanical four-strokeThe MaK M20, M25, M32 and M43 medium-speed four-stroke engines — liners, cylinder heads, piston crowns, connecting rods, fuel injectors, pumps and bearings, genuine and reconditioned beside Alang.
View all 23 M-series models
Common-rail four-strokeThe camshaft-free common-rail four-stroke — fuel injection and exhaust valves controlled electronically from a high-pressure rail. We hold rail valves, flow-control units, injection equipment, liners and crowns.
View all 3 M-series models
Current four-strokeThe MaK M32 — M32C and M32E. Liners, cylinder heads, piston crowns and fuel-injection parts.
View all 7 M-series modelsBy the numbers
Parts we supply
Original-bore & reconditioned liners for the full the M20 to M43 range and M-series range, honed to OEM tolerance with measurement reports.
Surface-ground four-stroke cylinder covers with bushings, studs and gasket kits across all M-series and M-series bores.
Forged steel crowns and skirts for all the M20 to M43 range and M-series bores — reconditioned crowns dimensionally verified.
Piston rods with renewed running surfaces, matched to your exact cylinder unit and crosshead.
Compression and oil-control ring sets — pre-profiled and chrome-ceramic rings to MaK-MaK spec.
Fuel injection valves, injector nozzles and atomisers for M-series and M-series engines, bench-tested before dispatch.
High-pressure fuel pumps, plungers and barrels for M-series, plus common-rail supply units and flow-control valves for M-series.
Complete exhaust valves — Nimonic spindles, valve seats, cages, bottom pieces and air-spring components.
Main, crankpin & crosshead white-metal, trimetal and bimetal shells with material test certificates.
Housings, scraper and sealing ring sets for the piston rod — a key M-series and M-series overhaul item.
Rail valves, flow-control units (FCU), injection control units and supply-unit parts for M-series / M43 engines.
Camshaft chain-drive links, tighteners, sprockets and gear-drive parts for MaK M-series engines.
Telescopic piston-cooling pipes and guide assemblies feeding oil to the crosshead and piston.
Cylinder and main starting-air valves, overhauled and pressure-tested for four-stroke engines.
Full sealing kits, cooling-jacket O-rings and high-temperature gaskets per engine model.
High-tensile cylinder-cover, tie-rod and main-bearing studs and hydraulic nuts.
Models & specifications
All 33 MaK-MaK four-stroke models we supply — genuine, OEM-equivalent, or Alang-reconditioned. Tap any model for an instant WhatsApp quote; can’t see yours? Send the nameplate and we’ll match it.
33 MaK-MaK four-stroke models indexed — genuine, OEM-equivalent & Alang-reconditioned. Send your exact M-series / M43 / M-series designation and we’ll match the part.
Which part is right?
Overhaul & repair kits
Send your exact the M20 to M43 range / M-series or M-series designation and we assemble a complete decarbonising, top-overhaul or major-overhaul kit — cylinder liners, piston rings, fuel injection valves, exhaust-valve spindles, stuffing-box rings, gaskets, O-rings and fasteners. Genuine or reconditioned, every kit ships with material or inspection certificates and a packing list cross-checked to your engine.

Piston rings, fuel injection valves, cylinder-cover O-rings, exhaust-valve grinding set and gaskets for a routine de-carb on one or all units.
Cylinder liner, piston rings, piston-crown inspection set, fuel injection valves, exhaust-valve spindle & seat and stuffing-box sealing rings.
Full running gear — liners, crowns, rods, main / crankpin / crosshead bearings, fuel pumps or common-rail parts and complete seal and fastener sets.

Inside the stockyard · 01
The camshaft-controlled M20 through M43, including the high-output range — liners, covers, piston crowns, fuel pumps, chain drives and bearings, genuine and reconditioned beside Alang.

Inside the stockyard · 02
The compact M20 and M25 — running gear, heads, valves and fuel equipment for gensets and auxiliaries.

Inside the stockyard · 03
The compact MaK M20 and M25 — cylinder heads, pistons, inlet and exhaust valves, fuel pumps and bearings for gensets and auxiliary sets.

Inside the stockyard · 04
Beside the world’s largest ship-recycling yard, we recover low-hour MaK-MaK parts no distributor stocks — documented, packed and airborne to your port.
Why Wattmare for MaK
Direct access to genuine, low-hour MaK-MaK M-series and M-series parts no distributor still stocks — 30–50% below European prices.
One WhatsApp, one photo. We confirm stock, document, pack and fly it to your port — day or night.
From obsolete MaK M-series fuel pumps and chain drives to M-series common-rail units — we know the difference and stock both.
Material certificates on genuine parts; inspection and measurement reports with photos on reconditioned.
How we source & recondition
Low-hour MaK-MaK parts recovered from vessels at the world’s largest ship-recycling yard.
Every part is dimensionally checked against OEM drawings and MaK-MaK tolerance limits.
Crack-detection, hardness and pressure testing on all critical liners, crowns, valves and bearings.
Inspection report, photos and a 30-day warranty — packed and air-freighted worldwide in 24–48 hours.
Fleets we supply
From capesize bulkers to LNG gas carriers — tap your vessel type for the full spare-parts range.

MaK M-series and M-series main-engine spares for handysize to capesize fleets.

M-series and M-series wear parts and fuel equipment for VLCC and MR fleets.

M-series/M-series running gear plus cargo-pump prime-mover spares for chem fleets.

High-output M-series and M-series spares for feeder to ultra-large vessels.

X-DF dual-fuel running gear and combustion components for LNG fleets.

MaK M25 and M32 spares for supply and anchor-handling vessels.

M-series and smaller-bore M-series spares for multipurpose and coaster ships.

M-series and M-series main-engine spares for PCTC and Ro-Ro fleets.

Smaller-bore MaK M20 spares for trawler fleets.

MaK M32 and M43 genset and auxiliary spares for passenger ships.

Auxiliary MaK four-stroke and running-gear spares for naval support vessels.

Legacy MaK M-series fuel pumps, chain drives and running gear no distributor still offers.
Where we deliver
Air-freighted from Alang / Bhavnagar to the world’s biggest bunkering and repair hubs in 24–48 hours. Tap a market for local lead times and ports.
Diagnose the fault
| Symptom | Likely MaK-MaK parts to inspect |
|---|---|
| Loss of compression or power on one unit | Cylinder liner, piston rings, piston crown |
| High exhaust temperature on one cylinder | Fuel injection valve / nozzle, exhaust valve spindle |
| Knocking or pounding from the crankcase | Main, crankpin or crosshead bearings |
| Excessive cylinder-oil consumption | Liner wear, piston rings, stuffing-box rings |
| Difficult or failed starting | Starting air valve, fuel pump (plunger / barrel) or rail valve |
| Black or smoky exhaust | Fuel valve nozzles, slide valves, turbocharger interface |
| Oil leak at the piston-rod gland | Stuffing box scraper and sealing ring set |
| Water in the combustion space | Cylinder cover, cooling-jacket O-rings, liner |
Compare the marques
Run a mixed fleet? We supply spare parts across all three of the great medium-speed four-stroke marques — here’s how they compare and where each one fits.
The complete guide
Wattmare is a specialist MaK engine spare parts supplier serving India, the UAE, Singapore and the wider global fleet. From our base in Bhavnagar — beside the Alang ship-recycling yard — we supply genuine, OEM-equivalent and reconditioned spares for every generation of MaK-MaK four-stroke marine main engine, dispatched worldwide in 24–48 hours.
The four-stroke engines on this page are built by MaK (Maschinenbau Kiel), now Caterpillar Motoren of Germany, a medium-speed engine maker since 1948. The M20, M25, M32 and M43 power ships and power plants worldwide. We supply spares across all of them.
The single most important question on any MaK-MaK order is whether the engine is an M-series, an M-series or an M-series. The MaK M-series is camshaft-controlled — fuel pump, fuel cam, chain drive and mechanical exhaust-valve gear. The M-series / M43 and the MaK M-series are electronically controlled, replacing the camshaft with a common-rail supply unit, rail valves, flow-control units (FCU) and hydraulically actuated exhaust valves. Liners, covers, crowns and bearings are broadly common by bore, but injection and actuation parts are entirely different — always give us your exact M-series / M43 / M-series designation.
For every MaK M20, M25, M32 and M43 bore we stock cylinder liners, cylinder heads, piston crowns and skirts, piston rings, connecting-rod and main bearings, fuel injectors, fuel pumps, inlet and exhaust valves, camshaft parts and turbocharger spares — genuine, OEM-equivalent and Alang-reconditioned.
Bhavnagar sits beside Alang, where hundreds of vessels are dismantled every year — including ships still running ageing MaK M-series four-stroke engines. That gives Wattmare direct access to genuine, low-hour parts that are slow or costly to source from distributors, at a fraction of new-part cost and lead time. For hard-to-find M-series fuel pumps, chain drives, liners or running gear, this is the fastest source in the world. Browse our reconditioned marine spare parts range, the wider main engine spare parts category, or sister brands like MAN engine spares and Mitsubishi UEC.
Send your MaK engine make and model with a photo or part number on WhatsApp, or use the quote form. We confirm availability and price — usually within the hour — and dispatch in-stock items within 24 hours. Typical air-freight transit is 12–18 hours to the UAE, 16–24 to Singapore, 20–26 to Greece and Turkey, and 28–36 to Northern Europe.
FAQ
Yes — cylinder liners are one of our strongest MaK-MaK lines. We carry original-bore and reconditioned liners for the M-series and M-series, plus the rest of the M-series range (M20 to M43), honed to OEM tolerance with measurement reports. Most legacy M-series liners are recovered and reconditioned beside Alang.
The MaK M-series is a camshaft-controlled (mechanical) four-stroke — fuel pump, fuel cam and mechanical exhaust-valve actuation. The M-series / M43 and the MaK M-series are electronically controlled, replacing the camshaft with a common-rail supply unit, rail valves, flow-control units (FCU) and hydraulically actuated exhaust valves. Liners, crowns and bearings are broadly similar by bore, but the injection and exhaust-valve actuation parts are completely different — always quote your exact the M20 to M43 range or M-series model.
We cover the full MaK range — M20, M25, M32 (M32C/M32E) and M43 (M43C) — every MaK bore.
Reconditioned parts ship with inspection reports, dimensional measurements and photographs, and are accepted by class societies (Lloyd’s Register, DNV, ABS, BV, ClassNK, RINA) on survey. Genuine MaK parts carry full material and test certificates.
In-stock items dispatch within 24 hours from Bhavnagar. Typical air-freight transit to the UAE (Dubai, Jebel Ali, Fujairah) is 12–18 hours. Singapore is 16–24 hours, Greece and Turkey 20–26, and Northern Europe 28–36.
Yes — fuel injection valves, injector nozzles, high-pressure fuel pumps, plungers and barrels for MaK M-series engines, plus common-rail supply units, rail valves, flow-control units (FCU) and injection equipment for M-series / M43 and M-series engines, are stocked and bench-tested before dispatch.
Genuine parts come from the original maker (MaK / MaK) with full certificates. OEM-equivalent are quality aftermarket parts at 30–50% less. Reconditioned are low-hour parts recovered from Alang, inspected and certified to OEM tolerance, at up to 70% less with a 30-day warranty.
Yes — obsolete MaK M-series parts are our specialty. Beside Alang we recover low-hour fuel pumps, chain drives, liners, crowns and running gear from M-series-powered vessels being dismantled, then inspect and certify them. For the M20 to M43 range and M-series engines this is often the fastest source in the world.
Yes — turbocharger spares, fuel injectors, pumps, camshaft parts, bearings and complete running gear for the MaK M20, M25, M32 and M43, genuine and Alang-reconditioned.
Send your engine model and a photo or part number on WhatsApp (+91 96647 18068), or use the quote form. We confirm availability and price, usually within the hour — whether you need genuine, OEM-equivalent, used or reconditioned parts, or a complete overhaul kit.
We ship from Alang/Bhavnagar to the UAE, Dubai, Singapore, Greece, Turkey and every major port worldwide in 24–48 hours. Parts are export-packed with VCI wrapping, wooden crates and palletisation, with photos shared before dispatch and full export documentation included.
Yes — decarbonising, top-overhaul and major-overhaul kits assembled to your exact the M20 to M43 range / M-series or M-series model, with liners, piston rings, fuel injection valves, exhaust-valve spindles, stuffing-box rings, gaskets, O-rings and fasteners included.
Request a quote · reply within the hour
Emergency MaK failure, dry-dock overhaul, or a long-term pipeline — send your engine and part, and a founding partner replies on WhatsApp, usually within the hour. Genuine, OEM, used or reconditioned.
Wattmare — Bhavnagar, Gujarat, India, beside the Alang ship-recycling yard. Genuine, OEM & reconditioned MaK-MaK spares, worldwide in 24–48 hours.
