All the advice on the installation
alignment and quality of the replacement starters may be spot on. However, the structural calamities experienced ( ring gear
failure, bearing support castings) combined with the timeline and type of use or lack thereof would have me looking at a partial hydro-lock from either raw water
intrusion or fuel
bleed from a leaky injector(s). The fact that a decade of use was nearly flawless would point to a change in the torque required for starting.
From experience, starting against a partial hydro-lock on a 3 cylinder Perkins
twisted and bent the starter mounting plate. A good marine diesel mechanic
would have pulled the injectors when he saw any of these types of failures.
This won't take you off the hook for getting the best, most reliable starting components available, a must for single
Things to check:
Operational changes in the raw water
Location and operation of a vented loop.
Location and operation of the fuel
Changes in the types of waters and sea states the vessel encounters.
and fuel filter
housing levels relative injector elevations.
Water lift muffler
Any one of these may eventually cost way more than starter components, even at Yanmar pricing.
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