I'm going to really throw a wrench in the works here. I have owned a few Volvos before. I can say the MD series was waaaaay better than the 2000 series but that is not saying much. I have also seen salt water
backing up into the exhaust
damaging springs. I'm not sure if it is a salt water
or the fast quenching of the cold water
against the very hot steel
. But I have seen it and also injector springs break...again, I know not why.
I did like my MD2B
but prices for parts
were rediculous and at 23hp. for a 13 ton boat, it was a little under-powered. I now have a 44hp Yanmar
and love it.
So if I might make a suggestion...If it is really old and beginning to develop a string of failures...perhaps its time to re-up in the engine
...You may castrate me now!