Mariposa | Repower Winter 2009

PROJECT NOTES

When one of the many fluid analysis reports came back with a "red flag" identifying traces of glycol (antifreeze) in the engine crankcase oil, it became apparent that a new engine might be in the picture sooner than anyone expected!”
Drew Whitford

MARIPOSA LITTTLE HARBOR 46

CENTER COCKPIT SLOOP

This past summer, the owners of Mariposa sailed their Little Harbor 46 center cockpit sloop to Noank Village Boatyard for a seasonal mooring. When it came time for our professional crew of riggers, service technicians, and equipment operators to put "Mariposa" to bed for the season, the owners had already lined up a fairly complete list of maintenance items above and beyond the usual decommissioning. However, when one of the many fluid analysis reports came back with a "red flag" identifying traces of glycol (antifreeze) in the engine crankcase oil, it became apparent that a new engine might be in the picture sooner than anyone expected. "Mariposa" was already set down inside the state of the art work shed when the analysis results came back. Without a history of previous readings, it was decided to relaunch and confirm the diagnosis with 3 more samples taken at 1 hour, 3 hour, and 5 hour increments of running time on the fresh new engine oil. The results confirmed the presence of glycol as well as metals most likely from excessive ring wear. The 17 year old Westerbeke 70 engine was ready for retirement.

The mechanical service department team, led by Drew Whitford, began measuring up and planning the removal of the old engine. It was immediately obvious that the old engine would have to be stripped down and removed in pieces. The same would apply for the new engine as well.

Once removed, the Noank Village Boatyard Crew began replacing all hoses, fittings, and seacocks that were in or ran through the engine compartment. Many engine packages were considered, with the criteria of maximum performance being stressed. Taking into consideration the space constraints, hull speed, potential, engine bed modification costs, and the modern propeller options, a Westerbeke 82B was the chosen. This engine is a 17% increase in horsepower over the original engine. It is outfitted with dual high output alternators. The entire drive train was upgraded or replaced including new shaft, Aqua-Drive, PSS shaft seal, and a Flex-O-Fold high performance propeller. Stay tuned!