The pump appears to be a CAV rotary injection pump. Probably available in the tractor world. Est $2000 new.
I would replace the raw water pump from the shaft style to the newer geared version. Est $5-600.
I would replace the heat exchanger and coolers. Est $6-700.
You could probably use starters and alternators off existing engines. I would want some assurance regarding parts availability before proceeding with the take out's. I trust someone else will chime in with model & hp.
Just read your synopsis of engine failures. What a nightmare! I can't believe a diesel mechanic could cause so much damage due to "errors." Unfortunately filing a claim in court will flush a few boat bucks down the drain.
Bomac Marine and Logan Diesel are the 2 largest Lehman rebuilders. If the engines are seized it could be something simple like mains or something complex requiring cylinder sleeves. No way of knowing until disassembly.
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