If the boat is pre-cat converter exhaust that would be worth a lot to me. Cat converter exhaust ultimately will close to triple the cost of replacing exhaust manifolds, if you keep it long enough to need to do that. Other than the normal I/O power package concerns (engine temp, overheating, engine alignment, shift quality, tilt/trim and steering operation, any leaks, etc), there is nothing out of the ordinary to be concerned about. Keep in mind that Volvo parts are expensive and not as available as Merc parts, but many prefer the cone clutch shifting in a Volvo vs the Merc Alpha (dog clutch like an outboard). Make sure it runs at the correct temp (160-175), that the oil pressure readings are normal (40-60 at speed, at least 20 at idle) and if you can take an IR temp gun with you and take readings of the risers and manifolds after running on plane. Should be less than 150*F. Pay attn to shift quality, it should be very smooth and there should not be whining from the drive as you accelerate. With the engine idling, climb into the engine compartment and listen, you should not hear any rumbling, howling, etc that suggests a bad gimble bearing due to a leaky driveshaft bellows. Also with the engine idling, trim up (not all the way like half way up) and turn left and right, listen for any increase in noise from the rear (u joints going bad).Take a good look at the engine compartment, look for oil leaks, and rust stains at the joint between the risers and manifolds. This would mean that its time to replace riser gaskets at least and if this is ignored, it can put water in a cyl via an open exhaust valve when the engine is shut off. Its a common problem on I/Os and Volvo particularly because they never changed their riser design as Merc did. Merc went to what's called the dry joint system which separated the exhaust gas and water cooling ports. A much better design, for the pre-catalyst system. I have not seen the cat systems taken apart yet only on display engines at the boat shows.
If you have a mechanic check it out, make sure they pull the outdrive drain plug and see if water comes out first (bad seals) and if there are excessive wear particles on the magnet (gear and bearing wear...$$$).
_________________ 88 Four Winns 200 Horizon 4.3 OMC Cobra-4bbl 2002 Walker Bay 10/2012 Suzuki 2.5 2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac 2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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