What else doesn't work?
Diesel "mechanics" are notorious for not being very good. "The mechanic came highly recommended by other fairly knowledgeable owner/mechanics." That said, yours may be great. I just don't know. It sounds like you weren't there. I understand work commitments, but you NEED to be there when anyone works on your boat."He said that it is likely that I will have more problems down the line because the signs of its 30 year age are upon us." Heck, they could say that about most of us! My engine is 21 years old. I've seen older engines that look even better than mine. I need to buy some Castrol Superclean and do a really good cleanup, but otherwise it runs great.Tony, you've posted so many great things here, take your time and analyze what your issues are, and take them step by step. If the block is good and things are working, and the injector pump is leaking, find out why and either repair or replace it.U wrote: " If, on the other hand, I run it to a point that it is no longer operating, I own another anchor." Sure, but why not learn about your engine and figure out what YOU want to do. Getting a second opinion is only gonna give you a choice between what two other people say. It's like this forum if you ask about teak treatment or dinghies! If the inside is good, clean the outside. Why even think about running it until it breaks, why not find out what needs to be done, do it, and keep it running? These engines should essentially last forever, being used about 100 to 200 hours per year, you've got what, the most 6,000 hours. That's only half the anticipated life of the engine. If you want to keep the boat, take care of the engine you have.I started with our engine when I bought the boat 9 years ago knowing NOTHING about diesels. I learned. I spent hours learning and working on the engine myself. The only time I had anyone else work on it, and I WAS there ALL the time, he messed it up, and I had to fix his work!Think of it as a safety issue: you know how to sail and dock the boat, learn about the engine. You don't need to learn diesel theory, just enough about the parts that you can fix, or, in some cases can't.It's much easier to hire a mechanic and say "Please remove the injector pump and repair or replace it," than it is to say "give me an opinion on the engine." The latter is just too big a question.Find out where and why the injector pump is leaking. It could be as simple as a loose hose clamp from the pump to the banjo. Aha, another great diesel engine term!!!Really, I'm no diesel engine expert, but I've learned all I could about my engine. I've installed a new HX, new hoses, new raw water pump and all those regular maintenance things I never thought I could ever do myself when we first bought the boat.Give it a try, apply yourself as you have with other things on the boat, and make your OWN decisions.Your engine, BTW, is a good one, and still being supported by the manufacturer. marindieseldirect.com is a resource, along with its link, torrensonmarine.com.You can do it!