What you still buy as a marine part

Heat exchangers, raw-water pumps, gearboxes, anodes, and wet exhaust stay marine. Internals follow the base engine.

The split that saves money without wrecking the boat

The start-here guide is about internals. Those internals include pistons, rings, bearings, many gaskets, and oil and fuel filters on the block. This page is the other half. Beta marinizes a Kubota block. The seawater kit, gearbox, and wet exhaust stay marine. Order those as marine or pump-maker parts.

I've listed both kinds of number. Seawater parts use marinizer or pump-maker numbers.

Always marine (or pump-maker)

Heat exchanger and header tank. The marinizer fits these onto the bare block. The exchanger, end covers, and often the pencil anodes in those covers use marinizer or aftermarket anode numbers. Those numbers include Sierra, Tecnoseal, and Martyr. Example: Universal/Westerbeke pencil 11885 / 011885 → Sierra 23-6400, Tecnoseal TEC-E0. That pair is anode interchange for the exchanger. See anodes.

Raw-water pump housing, cam, wear plate, pulley. The rubber impeller inside may be Jabsco/Johnson/Sierra (impeller chart). The tractor book rarely lists the pump as an assembly. A tractor circulating pump moves coolant in a closed loop. A raw-water pump eats seawater. Don't swap those two pumps.

Wet exhaust elbow and water-injected manifold. Tractor manifolds are dry. Wet elbows inject seawater. Keep those two lists separate.

Marine gearbox or saildrive. PRM, Hurth/ZF, Technodrive SP60, Volvo saildrive. The marinizer bolts that drive onto the block. Saildrive anodes (Tecnoseal 02516 on SP60 / Vetus KGF60-95 / Twin Disc 209-00509) are marine wear items.

Control panels, some senders, often the alternator and starter. Marinizers spec marine-duty electrics. A tractor alternator may physically bolt and still use the wrong clocking, pulley, or corrosion spec. I list those only when I've sourced an equivalents row.

Usually industrial (the cheaper channel)

Pistons, rings, main and rod bearings, many gasket sets, oil pump (block), injectors when they are the industrial type. Also on-engine oil and fuel filters for Kubota-based marques (oil, fuel). Beta 38: oil Kubota HH164-32430 / WIX 51307. Fuel Kubota 15221-43170 / WIX 33390. The same oil family supersedes toward HH1C0-32430. Fleetguard LF3706 and Beta 211-70510/02 sit in that oil family. Baldwin BF940 and Beta 211-60210 sit in that fuel family.

Indenor internals on MD27/29/32 use the industrial/Peugeot channel. Water pump Volvo 826920 = Indenor 571798.

Grey area: confirm on the engine

Freshwater circulating pump. Sometimes the engine uses the Kubota, Mitsubishi, or Ford pump. Sometimes a marine housing uses an industrial rotating group. Check the engine page and the base-engine BOM. If the page is silent, I haven't mapped that circulating pump.

Thermostat. The wax pellet may be industrial. The housing may be marine. Height and bypass matter as much as thread.

Belts. Length changes when a raw-water pump hangs on the front. If you haven't measured, don't copy a tractor belt length from a Kubota compact-tractor listing.

Engine mounts. Marine mounts are a different product. Some Volvo pages name owner-recommended Ellebogen mounts. Those links are owner references. Tractor cab mounts stay on the tractor.

Worked example. Beta 38

Buy as Kubota/aftermarket: oil filter HH164-32430 / 51307, fuel 15221-43170 / 33390. Also buy internals from the V1505 savings list when that list is present.

Buy as marine or pump-maker: heat exchanger, Johnson/Jabsco pump, and impeller from the chart after measuring. Also buy the PRM or the gearbox on the boat, the wet elbow, and exchanger anodes.

That's the split I care about. How to use the site shows where each list lives in the UI.

FAQ

If the raw-water pump says Johnson, is the impeller Kubota? The impeller comes from the pump maker, Sierra, or JMP.

Keel-cooled boats? You may have no raw-water pump on the engine. The base-engine internals story stays the same. Don't order Group B impellers just because the boat has a Beta 43.

Gensets? Same split. Many Onan/Fischer Panda sets use Kubota internals. Capsule, seawater pump, and control gear stay with the genset maker. See Generators.

These numbers come from public and third-party sources. They can be wrong. Check against an official source before you order. Methodology · All guides.