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Looking at twin 315 Yanmars with 1000 hours in them. Tranies to be included. Price will be negotiated next week. In order to negotiate price, I need to make a list of potential hardware repairs / replacements. The following is a raw check list of all I can imagine. Your suggestions will be most appreciated.

Instrument Panel

Piston assemblies

Piston rings

Liners

Cylinder heads

Main and rod bearings

Turbochargers

Stainless Steel Exhaust Elbows

Pumps

Coolers

Fuel Injectors

Valve guides

Oil seals

Fuel lines

Priming pumps

Alternators

timing belts changed at 1200hr. Zincs and were they went ie coolers. Valves checked.

turbo wash
valve adustment if wasnt done at 500hrs
how often was the oil changed, mine every 100hrs
impelers last changed
at 1000 hrs and proper maintance the engines should be great, have them checked out by a certifided mechanic.
i have 2100hr on my 230s and have to change out my raw water punps in the spring

examine every (24) valve keeper .there was a memo on this issue. only on stp 315hp i assume this is what your intending to buy. this is also a 315hp yanmar big block mechanical.stp has alluminum alloy exhaust elbows be aware!!