Volvo engines are especially well suited to the Seacracker. Just such an engine was installed in Sergeant Pepper in the Summer of 2000, so the information below might well be useful to owners contemplating an update . 

Compact and efficient power for sailing boats, the compact diesels are all fresh water-cooled with powerful 14V/60A alternators. Introduced in model year 1999 are two new and reliable marine gearboxes plus more compact installation dimensions for the 2000-series.
 
Insisting only on original parts and accessories, and regular servicing by an authorized dealer, is the wisest route to maintaining the legendary long-term reliability of your Volvo Penta engine and equipment. A fact well illustrated by the majority of all Volvo Penta engines ever manufactured that are still operating today. Keeping your engine ”original” also helps to protect the resale value of your boat.