I just put both of your post into one since they are basically the same question.
For a parts breakdown, just go to the upper left of this page and click on VOLVO PARTS. All the OEM breakdowns are there. They are listed under your particular engine.
You can also download the OEM service manual for the 270 at the link below.
Please, no PM's (Private Messages) regarding boat/engine problems.
That is what the forums are for.
Only forum/moderator issues will be answered in PM's.