Cummins · Inboard diesel

Cummins 6BT / 6BTA 5.9

The 6BT and 6BTA are the marine versions of Cummins’ mechanical 5.9-litre B-series in-line six with 12 valves, sold for boats since 1985. The 6BT is turbocharged only and has a Lucas CAV rotary injection pump (180 to 220 hp); the 6BTA adds an aftercooler, cooled by the engine coolant on the 250 and 260/270 hp versions and by sea water on the 315/330 and 355/370 hp versions, with a Nippon Denso pump on early engines and a Bosch P7100 in-line pump later. Cummins MerCruiser Diesel still sold both in 2008 as its Diamond series, next to the electronic common-rail QSB5.9 that followed them in the same power range (later the QSB6.7); the QSB shares some cooling-system parts with the late 6BTA but not its fuel system, and Cummins still offers the 6BT/6BTA as remanufactured ReCon engines from 180 to 370 hp. Parts change with rating and year, so the CPL number on the engine data tag, not the horsepower, decides which injector, sea-water pump or heat exchanger fits.

Manuals & documents

Cummins no longer publishes the 6BT/6BTA manuals openly: the owner’s manual and the parts catalogue for your serial number come from Cummins QuickServe Online after registration, or as PDFs from Cummins specialists such as Seaboard Marine, whose site also hosts Cummins’ installation directions. Its pages turn away automated requests but open normally in a browser. The data sheets of Cummins MerCruiser Diesel, which sold these engines until at least 2008, survive on archive.org. We host no manuals or drawings.

Wear parts & part numbers

PartOEM numberAlso fitsNote
Engine oil filterLF38941,2,3—Fleetguard’s premium spin-on filter, 93.5 mm across and 176 mm tall. Seaboard Marine sells it for all mechanical B-series and QSB engines and notes that every 4B, 6B and QSB 5.9 it has worked on takes the 1-16 thread.
Engine oil filterLF33494,5,3—Fleetguard’s standard B-series filter with the same 1-16 thread. Cummins lists it (as Cummins 3932217) in the service parts of its 6BTA5.9 fire-pump engine and Diesel Parts Direct on its 4BT/6BT page; we found no marine-specific listing, so compare it with the filter on your engine.
Fuel filter (engine)FF50526,7,4—On-engine spin-on filter with drain; Seaboard Marine sells it for all 6BT 210 (CPL 742) and says it replaces FF42000 and FS1251 there. Cummins lists FF5052 (Cummins 3931063) for its 6BTA5.9 fire-pump engine.
Fuel filter (engine)FS12518,9—Spin-on filter with drain for early engines with a CAV or Nippon Denso pump: 6BT 210, 6BTA 250 and 300 (Seaboard Marine); replaces FF5018.
Fuel filter (engine)FF528510,11,12,13—For the late 6BTA (also late 4BTA and 6CTA), per Seaboard Marine, which also sells FS1280, a version with water drain, for the same engines.
Raw water pump impeller10615K14,15,16,17—Sherwood impeller kit for the M71 sea-water pump, which Seaboard Marine lists for the 4BT and 6BT; Sherwood gives 10615K for the M71.
Raw water pump impeller15000K18,19,20,21,22,23—For the Sherwood GC1 and GC5 pumps (1.5 in ports) of the early 6BTA 250, per Seaboard Marine; Sherwood gives 15000K for both pumps.
Raw water pump impeller17000K25,26,27,17,24Johnson Pump 09-704BT-124Jabsco 18958-000124For Sherwood’s 1700-series pumps: Seaboard Marine says Cummins fitted them from the 6BTA 300 (CPL 970, about 1988), and the 1730 from about 1995 on the 270, 330 and 370; Sherwood gives 17000K for the P1730C. Johnson Pump lists its 09-704BT-1 for the ‘Cummins 6B 300Hp B Series’ and as the match for Sherwood 17000K and Jabsco 18958-0001.
Raw water pump390745814,15replaces 3912019—Sherwood M71 for the 4BT and 6BT; replaces the M70 (Cummins 3912019), per Seaboard Marine.
Raw water pump327944920,21,18,19—Sherwood GC5 for the 6BTA 250 with 1.5 in ports; Seaboard Marine also gives Cummins 3912962. Early 250 hp engines can have the Sherwood GC1-01 instead.
Raw water pump526599426,27—Sherwood 1730, fitted from about 1995 to the 6BTA 270, 330 and 370 (and the 6CTA), per Seaboard Marine, which also makes its own SMX 1730 as a direct replacement.
Anode (engine)6824128,29,30,31—1/2 in pencil zinc for heat exchanger and aftercooler of all mechanical B- and C-series engines (Seaboard Marine). The factory gear-oil coolers of these engines usually have no zinc; many replacement coolers take two 3/8 in zincs.
Heat exchanger gasket391034332,33—Two-piece end-cap gasket set for the heat exchanger of the 4BT, 6BT and 6BTA; the matching washers are Cummins 3975186/3910556 (Seaboard Marine).
Aftercooler O-ring391985334,35,36—Thin O-ring of the B-series aftercooler; a set is two thin (3919853) and two thick (4019975) rings. Not for the MOTA aftercoolers Cummins has supplied since mid-2020, which need their own rings.
Serpentine belt328868937,38—Green belt, fits most mechanical 6BT/6BTA (Seaboard Marine, which also gives 5690184).
Serpentine belt328873539,40—Yellow, longer belt for engines with a large-frame alternator or without the idler pulley (Seaboard Marine, which also gives 3911586).
Cylinder head gasket328333541,42—Standard thickness; oversize gaskets are 3283337 (+0.25 mm) and 3283339 (+0.50 mm). Seaboard Marine sells it for the 6BTA, Diesel Parts Direct for the 4BT and 6BT.
Valve cover gasket393090643,44—Silicone gasket for all B-series engines with individual valve covers (Seaboard Marine); Diesel Parts Direct lists it for the 4BT and 6BT.
Exhaust mixing elbow391089445—6BT (and 4BTA): 1.25 in water inlet, 5 in exhaust hose (Seaboard Marine).
Exhaust mixing elbow391471746—Early 6BTA (and 4BTA): 1.5 in water inlet, 5 in exhaust hose (Seaboard Marine).
Exhaust mixing elbow391937347—6BTA, also QSB5.9: 1.5 in water inlet, 6 in exhaust hose; for the early 6BTA Seaboard Marine lists 3914717.
Heat exchanger391058348,49—Early style for the 6BT and the 6BTA 250, CPL 742, 8206, 2891, 953 and 1247 (Seaboard Marine).
Heat exchanger401995850,51—Early style for the 6BTA (Seaboard Marine, which explains in an article how to tell the early and late exchanger apart).
Heat exchanger402010152—Late style, 4 in, for the 6BTA and also the QSB5.9 and QSB6.7 Slimline (Seaboard Marine).
Fuel injector380233353—6BT 180/210, CPL 742, 953 and 2891 (Seaboard Marine’s title also names 220 and 250 hp).
Fuel injector408925454—6BT 220, CPL 8206 (Seaboard Marine).
Fuel injector380233555—Early 6BTA 250, CPL 1247 and 1322 (Seaboard Marine).
Fuel injector380232356—6BTA 300, CPL 970 (Seaboard Marine).
Fuel injector380262157—6BTA 315/330, CPL 1928 (Seaboard Marine).
Fuel injector380281858—Late 6BTA 260/270 and 315/330, CPL 1975 and 2205; the title also names CPL 2956 (Seaboard Marine).
Fuel injector380283359—6BTA 355/370, CPL 2208 and 8457; also the 4BTA 250 Diamond (Seaboard Marine).
Stop solenoid392197860—12 V fuel shut-off solenoid for 6BTA engines with the Nippon Denso pump, typically CPL 970 (Seaboard Marine).
Air filter—61,62,63,64S&B AF-45HT61,62S&B AF-35HT63,64No Cummins element number found. Seaboard Marine’s S&B kits: AF-45HT for the 6BTA from 250 hp (4 in turbo inlet), AF-35HT for the 6BT up to 220 hp (3 in inlet), which does not fit the 6BTA. Neither replaces a Walker AirSep element.

Numbers checked against the sources below on 23 October 2026. Always confirm against your serial number and exact type before ordering.

Service intervals

TaskInterval
Oil level checkDaily, together with the coolant level65
Fuel pre-filterDrain the fuel/water separator daily; replace its element every 300 h or yearly65
Sea water strainerClean daily65
V-belt checkCheck the drive belt daily; check the belt tensioner every 600 h or 2 years65
Crankcase ventilationCheck the breather tube daily65
Air filterCheck the restriction every 75 h or 3 months; change the element every 300 h or yearly65
AnodeInspect every 75 h or 3 months, more often depending on electrical bonding and water conditions65
Hoses & clampsEngine and sea-water hoses every 75 h or 3 months65
BatteryEvery 75 h or every 3 months65
Engine oil changeEvery 300 h or yearly65
Oil filterEvery 300 h or yearly65
Fuel filterSpin-on filter every 300 h or yearly65
Aftercooler serviceFlush every 300 h or yearly65
Heat exchanger cleanFlush the sea-water side every 300 h or yearly65
Raw water impellerInspect the sea-water pump every 300 h or yearly65
Coolant changeChange the coolant filter and check additive (SCA) and antifreeze every 300 h or yearly; drain, flush and refill every 600 h or 2 years65
Gear oil coolerFlush every 300 h or yearly; see the gearbox maker’s manual65
Valve clearanceEvery 600 h or every 2 years65

Cummins’ schedule is in the operation and maintenance manual for B and C series marine engines, which Seaboard Marine sells as a PDF and Cummins makes available through QuickServe Online. The rows above follow Seaboard Marine’s list of the Cummins maintenance procedures for the 6BTA and 6CTA; at each longer interval, also do the shorter ones, and check the figures against the manual for your engine’s CPL.

Specifications

Cylinders6 in line, four-stroke diesel, 12 valves (two per cylinder)66,67
Displacement5.9 l (359 cu in)66,68
Bore × stroke102 × 120 mm (4.02 × 4.72 in); Cummins’ ReCon page and data sheet DS-4960 round the stroke to 119 mm68,69,66,70
Versions6BT (turbocharged): 180 bhp (commercial, CPL 2891), 210 bhp/220 mhp (CPL 742; 220B: CPL 8206) · early 6BTA: 250 hp (e.g. CPL 1247, 1322), 300 hp (CPL 970, Nippon Denso pump) · 6BTA with Bosch P7100, aftercooler on the engine coolant (JWAC): 260 bhp/270 mhp (CPL 2205, 2956) · aftercooler on sea water (SWAC): 315 bhp/330 mhp (CPL 1928, 1975), 355 bhp/370 mhp (CPL 2208, 8457). Cummins MerCruiser Diesel named them 220B, 270B, 330B and 370B66,71,72,73,74,75,6,55,56,57,58,59
PowerPleasure boats (High Output, Cummins ReCon list): 6BT 220 mhp/210 bhp (157 kW) · 6BTA 250 mhp (184 kW), 270 mhp/260 bhp (194 kW), 300 mhp (214 kW), 330 mhp/315 bhp (235 kW), 370 mhp/355 bhp (265 kW) · commercial: 6BT 180 bhp (134 kW, medium continuous) and 210 bhp (157 kW, intermittent), 6BTA 260 bhp (194 kW) and 315 bhp (235 kW, intermittent). mhp is crankshaft power to ISO 3046, bhp to ISO 8665 (Cummins MerCruiser Diesel spec sheets)66,76,77,78,69,79,68
Rated speed6BT: 2600 rpm (180 bhp commercial: 2500 rpm) · 6BTA: 2600 rpm (250 to 270 hp), 2800 rpm (300 to 330 hp), 3000 rpm (370 hp)66,79
Idle speed6BT (220B): 700 rpm · 6BTA (270B, 330B, 370B): 600 rpm; ±50 rpm72,73,74,75
InjectionMechanical throughout · 6BT: Lucas CAV rotary pump · early 6BTA: Nippon Denso EP9 pump (for example the 300, CPL 970) · later 6BTA (260/270, 315/330, 355/370 hp): Bosch P7100 in-line pump66,72,73,74,75,60,8,80
Aspiration6BT: turbocharged · 6BTA: turbocharged and aftercooled; the 250 and 260/270 hp versions cool the aftercooler with engine coolant (JWAC), the 315/330 and 355/370 hp versions with sea water (SWAC)68,77,69,74,81
Compression ratio6BT (220B): 16.5:1 · 6BTA (270B, 330B, 370B): 15.3:172,73,74,75
Firing order1-5-3-6-2-472,75
Direction of rotationCounterclockwise, facing the flywheel68,69
Engine oil capacityOil pan 12.3 l (13 US qt, low mark) to 14.1 l (15 US qt, high mark); whole system about 15 l (16 US qt). Commercial engines could have a 31 l high-capacity pan70,82,68
Oil pressureAt least 69 kPa (10 psi) at idle; 207–448 kPa (30–65 psi) in normal running70
Coolant capacityEngine only 12.9 l (13.6 US qt); engine with heat exchanger 20.6 l (21.6 US qt)70
Thermostat opens at83 °C (181 °F), fully open at 95 °C (203 °F); maximum coolant temperature 96 °C (205 °F)70,75,74
CoolingFresh-water circuit with heat exchanger or keel cooler, pressure cap 103 kPa (15 psi); Sherwood sea-water pump. On sea-water aftercooled engines the sea water also runs through the aftercooler70,68,75,26,83
Dry weightWith heat exchanger: 6BT 220 hp 508 kg (1120 lb); 6BTA JWAC 517 kg (1140 lb); 6BTA SWAC (330 and 370 hp) 581 kg (1280 lb). Keel-cooled commercial 6BTA: 469 kg (JWAC), 538 kg (SWAC)76,77,69,68
DimensionsLength × width × height: 6BT 220 hp 1073 × 711 × 812 mm; 6BTA SWAC 1041 × 816 × 771 mm; 6BTA JWAC 1028 × 826 × 837 mm76,77,68
Maximum torque220B: 726 N·m (535 lb-ft) at 1800 rpm · 270B: 942 N·m (695 lb-ft) at 1800 rpm · 330B: 926 N·m (683 lb-ft) at 2000 rpm · 370B: 992 N·m (732 lb-ft) at 2200 rpm72,73,74,75
Fuel consumptionAt rated speed on the propeller curve: 220B 45.3 l/h (12.0 US gal/h), 270B 57.5 l/h (15.2), 330B 65.8 l/h (17.4), 370B 76.1 l/h (20.1); the 370 uses about 45.8 l/h (12.1) at 2600 rpm76,77,74,69
Battery12 V: at least 950 CCA (6BTA SWAC: 1100 CCA), reserve capacity 160 min · 24 V: 475 CCA (SWAC: 550 CCA)70
Engine number locationData tag on the engine with model, engine serial number (ESN), CPL number and rated power and speed; Seaboard Marine shows where it sits on the 6BT/6BTA84
Years builtMarine version from 1985; Cummins MerCruiser Diesel still listed the Diamond 6BT5.9-M and 6BTA5.9-M in 2008, and Cummins now supplies them as remanufactured ReCon engines82,85,80,66
SuccessorQSB5.9 with electronic common-rail injection (Cummins MerCruiser Diesel Quantum series, 330–480 hp in 2008), later QSB6.786,87,3

Good to know

  • Before ordering, read the model, the engine serial number (ESN) and the CPL off the data tag. Many CPLs of this engine exist, and the parts follow the CPL, not the horsepower: the injector alone is 3802333 on a 6BT 210 (CPL 742), 4089254 on a 220 (CPL 8206), 3802323 on an early 300 (CPL 970) and 3802833 on a 370 (CPL 8457).84,53,54,56,59
  • Three generations of Sherwood sea-water pump take three different impellers: 10615K in the M71 of the 6BT, 15000K in the GC1/GC5 of the early 6BTA 250, 17000K in the 1700-series pumps from the 300 on. Seaboard Marine advises renewing cam and wear plate along with the impeller once a pump has seen salt water for a few years; on the later 6BTA the pump sits behind the front engine mount, and you may have to take the weight off that mount to get it out.88,16,22,25
  • The aftercooler needs the most attention: Cummins’ schedule has it flushed every 300 h or yearly, and Seaboard Marine reassembles it with plenty of grease (it uses Alco Metalube), because corrosion between the brass core and the aluminium housing makes it hard to take apart later. Since mid-2020 Cummins supplies MOTA aftercoolers whose cores, caps and O-rings don’t fit the older units, so check which one you have before ordering seals.65,89,36
  • On B- and C-series marine engines of the late 1980s and early 1990s the idler pulley mounting failed too often; Cummins improved it around 1994, and Seaboard Marine describes an upgrade with a 7/16 in grade 8 bolt for older engines. Most engines take the green belt 3288689; engines with a large-frame alternator or without the idler need the longer yellow 3288735.90,37,39
  • The 6BTA tolerates overheating badly: the factory thermostat starts to open at 83 °C (181 °F), and Cummins sets the maximum coolant temperature at 96 °C (205 °F), the point at which, according to Seaboard Marine, the standard alarm sounds. Seaboard therefore recommends a second, independent alarm and, for hard-working planing boats, its own 160 °F thermostat; that is a dealer’s recommendation, not a Cummins specification.70,85
  • Cummins’ schedule has the zinc anodes inspected every 75 h or 3 months, more often depending on bonding and water. Heat exchanger and aftercooler take the 1/2 in pencil zinc 68241; the factory gear-oil coolers of the mechanical B series usually have no zinc, but many replacement coolers take two 3/8 in zincs, so check yours.65,28,30

Videos & how-tos

Links to YouTube, nothing embedded. The maker’s own channel comes first; the rest are channels we found clear and correct for this model.

Fitted in

Boats whose builder lists it as standard or optional equipment:

  • Grand Banks 42 — Cummins 6BT5.9M 210 hp · 6BTA5.9M3 315 hp · 6CTA8.3M3 430 hp × 2 (Options 2001–2004 (Grand Banks’ codes mod 220B, 330B and 450C); in 2003 the Motoryacht only with the 210 or 315 hp)

On the marketplace

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  83. sbmar.com/product/6bt-6bta-aftercooler-heat-exchanger-maintenance-kit/
  84. sbmar.com/articles/find-cummins-marine-engine-details/
  85. sbmar.com/articles/choosing-the-160f-or-180f-thermostat-for-your-cummins-6bta/
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  89. sbmar.com/articles/cummins-marine-aftercooler-maintenance/
  90. sbmar.com/articles/idler-pulley-issues-on-cummins-6bt-6bta-5-9/

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