Beta Marine 75
75 HP · Heat exchanger (freshwater / indirect) cooled
The Beta Marine 75 (Beta 75) is a 75 hp naturally aspirated marine diesel built on the 4-cylinder Kubota V3600 base block. It uses indirect injection and heat-exchanger freshwater cooling, and is the largest naturally aspirated engine Beta offers — a common repower for heavier displacement cruisers and small workboats that want power without a turbo. It uses its own heat-exchanger, impeller and air-cleaner parts (different from the smaller ranges) but follows the same heat-exchanger maintenance schedule. Below are its published specifications, the maintenance schedule, and the genuine Beta service-part numbers.
Specifications
| Engine type | 4-cylinder, naturally aspirated, indirect injection |
|---|---|
| Base engine | Kubota V3600 (BV3600) |
| Displacement | 3620 cc (220.9 cu in) |
| Bore × stroke | 98.0 × 120.0 mm (3.86 × 4.72 in) |
| Compression ratio | 22.6 : 1 |
| Maximum output | 75 HP (56.0 kW) @ 2600 rpm |
| Maximum torque | 221.0 Nm @ 1600 rpm |
| Fuel | Diesel (EN590 / ASTM D975) |
| Fuel injection pressure | 140 kgf/cm² (1991 psi) |
| Injection timing | 9.0° BTDC |
| Starting aid | Glow plug |
| Firing order | 1-3-4-2 |
| Valve clearance (cold) | 0.25 mm (0.0098 in) |
| Oil pressure at idle | ≥ 1.0 kgf/cm² (≥ 14.0 psi) |
| Oil pressure at rated rpm | 3.0–4.5 kgf/cm² (43–64 psi) |
| Engine oil capacity | 13.2 L (3.49 US gal) standard sump |
| Coolant capacity | 10.2 L (2.70 US gal) |
| Recommended starter battery | 180 Ah, 1050 CCA |
| Dry weight | 414 kg (913.0 lb) |
Maintenance schedule
Beta Marine's recommended service intervals for this engine. Most items are time-or-hours, whichever comes first — boats that sit still hit the calendar interval long before the hours.
Daily, or every 8 hours of running
- Check engine oil level
- Check gearbox oil level
- Check coolant level
- Check battery electrolyte level
- Check drive-belt tension and alternator mounting bolts
- Confirm the raw-water inlet strainer is clear
- Check stern-gland lubrication (if fitted)
- Drain any water from the fuel/water separator
- Run the engine to temperature and check for leaks
After the first 25 hours (running-in)
- Change gearbox lubricant (see the separate gearbox manual)
- Re-check all external nuts, bolts and fastenings — especially the flexible-mount lock nuts, since loose mounts cause vibration and shaft misalignment
- Re-check and adjust drive-belt tension
- Check and grease the ball-joint nyloc nuts on the gearbox and throttle-control levers
After the first 50 hours (running-in)
- Change engine oil
- Change the oil filter
- Check the heat-exchanger tube-stack end caps for leaks and tighten if needed
- Drain any water from the fuel/water separator
After 150 hours
- If a shallow sump is fitted, change the engine oil and filter at this point
Every year or 250 hours, whichever comes first
- Change engine oil (standard sump)
- Change the oil filter
- Check the air-cleaner element
- Inspect the raw-water pump impeller and replace if worn
- Check the sacrificial anode and replace as needed
- Remove and clean the heat-exchanger tube stack, renew its O-rings, refill with correctly mixed antifreeze, and check for leaks
- Lubricate the key-switch barrel
- Re-check external fastenings and the ball-joint nyloc nuts
- Change the fuel filter
Every 500 hours (in addition to the 250-hour service)
- Change the air-cleaner element
Every 1500 hours
- Check valve clearances
- Check injector nozzle pressure
Genuine service parts
Beta Marine part numbers for the routine service items on this engine. Several vary by build date or cooling type — check the note before ordering. Genuine parts are stocked by the Beta Marine dealer network; where a cross-reference is shown, an aftermarket equivalent is also available.
| Fuel filter (Kubota plunger-type element) | 211-60210 / 211-02817 From 2008 the short (~70 mm) element 211-60210 is fitted; pre-2008 engines used the long (~115 mm) element 211-02817. Confirm by element length before ordering. |
|---|---|
| Engine oil filter | 211-70510/02 Spin-on oil-filter element for the BV3600 block. |
| Raw-water pump impeller kit | 207-10709 Fits the Beta Marine (from Nov 2013) and earlier Jabsco gear-driven pumps. If the belt-driven Johnson pump is fitted, the impeller kit is 207-02132-KIT instead. |
| Sacrificial zinc anode (heat exchanger) | 209-61840 Pencil anode in the heat-exchanger end cap. Replace at least annually — more often in warm or brackish water. A wasted anode lets the tube stack corrode. |
| Heat-exchanger tube-stack O-rings | 209-00814 Pair (qty 2) — standard for all engines to 2019. The 2019-spec manifold adds a third O-ring; for that build use the triple O-ring kit 209-21737 (with tube adaptor 201-10963). |
| Air-cleaner element | 211-03819 Air-cleaner element from September 2009. Earlier builds: 211-04109 (to Aug 2009) or 211-96980 (to Jan 2004). |
| Alternator drive belt | Varies by configuration Configuration-dependent — Beta marks this “check before ordering”. With the standard Kubota alternator a V-belt 214-94260 or 6PK poly-vee 214-04776 is typical; higher-output alternators use different belts. Confirm against your alternator and pulley set. |
| Thermostat | 600-07489 Thermostat (from October 2004); gasket is 600-04360. Replace on-condition if the engine runs cold or overheats. |
| Fuel lift pump | 600-01466 Mechanical lift pump; gasket is 600-00065. |
| Coolant pressure cap | 209-80130 Heat-exchanger filler / pressure cap. |
What owners watch
Raw-water impeller
The impeller is on the annual / 250-hour list, but it is worth inspecting more often — a shredded impeller can overheat the engine within minutes. Carry a spare (207-10709) and know where the raw-water pump is before you need it. If your engine has the belt-driven Johnson pump, the kit is 207-02132-KIT instead.
Heat-exchanger tube stack
The annual service includes pulling the tube stack, cleaning it, and renewing the rubber O-rings (209-00814). On 2019-spec manifolds there is a third O-ring — use the triple O-ring kit (209-21737) for those builds.
Flexible engine-mount lock nuts
Beta calls out checking the flexible-mount lock nuts during running-in. On a heavier engine like the 75, loose mounts throw off shaft alignment and cause vibration — worth a look any time you notice new vibration.
Fuel/water separator
Draining water from the separator is a daily-use item. On a boat that sits, water and diesel bug accumulate, and a watered or clogged filter is the most common no-start or power-loss cause on this engine.
Cold starting
The 75 uses glow-plug pre-heat. Hard starting when cold is often a glow-plug or relay fault rather than a problem with the engine itself.
Manufacturer documentation
The figures above are summarised for quick reference. For the full operator's manual and illustrated parts list, go straight to Beta Marine — they keep the current revision, so you always get the right version for your engine.
Beta revises these documents — always download the current revision for your engine from their site.
Other engines in this range
Never miss a Beta Marine 75 service
Keeply builds your engine's maintenance schedule, tracks the hours, and reminds you before a service is due. Ask First Mate "what's overdue?" and get an answer from your own records. Free to start, no credit card.
Track your Beta Marine 75 →Specifications and service intervals are transcribed from Beta Marine’s heat-exchanger operator manual (OM-221-20031-HE, Rev 46) technical-data tables; service-part numbers are from Beta Marine’s Illustrated Parts List for the Beta 75 & 90 (naturally aspirated) range (IPL-221-10914, Rev 20). Figures are for reference only — Beta revises both documents, and several parts vary by build date, cooling type and serial number. Always confirm against the current manual and your engine’s own documentation before ordering parts or carrying out service.