Which replacement diesel engine and saildrive suit a Sveakryssare 36?

For a Sveakryssare 36, compare the Volvo Penta D1-30 with its matched 130S saildrive and the Yanmar 3YM30AE with an SD25, then check both against the boat's displacement and installation dimensions. The existing engine beds, saildrive foundation and propeller clearance determine which package fits.

Measure the existing installation

Start with the identification plates on the engine and saildrive. A previous owner may have replaced the machinery, so the boat's name alone cannot tell you what will fit.

Before asking for quotations, collect:

• Engine and drive model numbers, serial numbers and photographs of their mountings.
• The boat's loaded displacement, preferably from a recent lift rather than an old brochure.
• Engine compartment length, width and height, including room to remove the impeller, filters and starter.
• Engine bearer spacing and height, plus the position and dimensions of the saildrive foundation.
• Existing propeller diameter, pitch, number of blades and clearance to the hull.

Pay particular attention to the saildrive foundation. A replacement drive may need a different moulded bed, hull opening or engine position. Those alterations can cost more than you save on the engine. If the boat has a shaft drive, give serious consideration to retaining it before converting to a saildrive.

Match power to displacement

A diesel of around 30 hp is a sensible starting point for a 36-foot sailing yacht, but length alone does not determine the power required. A relatively light boat with a clean hull has different needs from a heavily loaded cruiser carrying extensive equipment.

For a heavier boat, or one regularly motoring into strong headwinds and short seas, compare a package of around 35 to 40 hp too. Extra power provides reserve, but cruising speed through a displacement hull will not rise in proportion.

The propeller must allow the engine to reach its specified full-load operating speed. Too much pitch overloads the engine; too little wastes available thrust. Ask the supplier to calculate the propeller using the actual displacement, engine rating and saildrive reduction ratio.

Compare engine and saildrive packages

• Volvo Penta D1-30 with 130S: a three-cylinder engine in the roughly 28 to 30 hp class. Get an early quotation if the boat already has a Volvo saildrive installation, though an older Volvo foundation is not automatically compatible.
• Yanmar 3YM30AE with SD25: another compact three-cylinder option in the same power class. Compare its installation drawing, service access and local parts support with the Volvo package.
• Volvo Penta D2-40 with a matched saildrive: a four-cylinder alternative of around 40 hp if the displacement and intended use justify it. Confirm the precise drive specification, weight and clearances with the supplier.
• Beta Marine or Nanni: alternatives worth considering where a local installer supports their engines and can supply an approved saildrive package or documented conversion. Specify the complete combination before comparing prices.