Join Date: Sep 2007
Location: North Florida
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Re: Volvo Penta MD2 Valve Job
Blowing oil? Where's it coming out?
It could just be that the head needs to be retorqued.
It could also be that the head is warped, or rings are worn, or the cylinders are worn, or the valves are shot, or the valve guides are worn, etc, etc.
You really won't know until you get the head off of the block.
Since the boat's not yet yours, you are at a bit of a disadvantage since you can't start pulling parts for a proper diagnosis.
If I were in your shoes, I'd call a local shop that works on Pentas. Ask them what they'd charge you for a complete top end job. Let the seller know that your offer price reflects this anticipated expense. If he balks, tell him you are assuming risk anyway since the top end job is not guaranteed to fix the problem.
Now after you own the boat, much of the work you can do yourself (if you or your friend can wrench.) A decent top end job should include having the valve seats reground (not just lapping in the new valves.) Unless your BFF has a machine shop in his basement, at least that part will need to go out. If the head's warped, that'll also need machine shop attention.
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'85 BYB Vagabond 39