I have a Yanmar
YSB8 on my 29 ft sailboat and have just decided that I want to keep it and do everything I can to extend its running life for as long as possible. It was installed in 1976. My question now is where to draw the limit on maintenance
It got a new cylinder head
ten years ago and a new exhaust elbow
three years ago.
It is sea water
cooled and has always been running in sweet or brackish water
I live in a climate with long cold winters.
It sits in a sailboat and has probably been used for auxiliary propulsion
only and only a few hours every season.
It starts easily every time, in any temperature and runs with a smooth steady rhytm, down to really low rpm
My inner turmoil on maintenance
ambition level can be boiled down to two extremes:
1, Reactive: change oil
and filters and winterize properly and then address problems as they come up.
2, Proactive: lift
it out and strip it down and follow the work shop manual and check/clean/replace all wearing parts
to prevent serious failures that will otherwise inevitably come.
Ideally there is a middle way...
In other words:
is a 40 year old well functioning engine
one that should be left alone to do its job undisturbed (save for oil- and filter changes) until it eventually brakes down because of age and for reasons that I can't prevent anyway.
Is a 40 year old well functioning engine
building up internal wear problems that should be detected and addressed by inspection
before they become serious.
Not an easy one, I know, but interesting and a very central issue for us running old boats on low budgets.