Re: Is boring one side of my V6 ok?
Jon and OBJ are right (as usual), your plan is OK about the boring. IF the standard side is within spec. I'd bet it's not. Think about it -- it's been run, then honed once and run again. And who knows how far they honed it?? Even though it wasnt the side hurt, it will see some unusual strain during the 2 failures. Even if it's within spec I'd bet it's at max now.<br /><br />To bore or not to bore -- that is not the question. Thats easy -- the measurements will answer that question. And it's perfectly OK to run 3 standards and 3 .044's (they're not .045's -- I know that's odd but there's a perfectly legitimate reason for that)<br /><br />Anyway, the real question becomes, what really happened and what caused it? Scored pistons and cylinder walls are a result -- not a cause. <br /><br />Here's a guideline to keep in mind -- on your motor the fuel delivery is across, 1&2, 3&4, 5&6. The ignition is side to side. <br /><br />I'd sure want to know what the cause was before I threw pistons at it. I know there's a lot that can't be checked unless it's running but I wouldn't accept it back simply "rebuilt". I'd want them to find and correct the cause.<br /><br />You're not alone. Not finding the cause of an issue is the single biggest cause of repeat failures on outboards. By far.<br /><br />It could be as simple as running too hot a spark plug. Or the wrong fuel. <br /><br />I know this is a lot to digest and youre probably a bit stressed (I would be) but there's one more thing we see all the time -- The motor was rebuilt once. Lets assume that the other side is within specs but at or towards the max tolerances. The bored side will be at "new" tolerances (clearances). When the motor is back running, which side is doing the most work? The bored side. The "nearly wore out" side is very lazy and not producing it's fair share of torque. You still expect the motor to push the boat at the same speed, cruise or wide open. Understandable. But that puts a real strain on the "fresh" side. <br /><br />Keep us posted with your progress.
