Mercury 850 mid seventies serial numver 7033755<br /><br />Some images<br /> http://www.geocities.com/mercfix <br /><br />I guess the ring in cylinder number 2 broke apart and left bits of iteslf imbedded in the piston and the head. <br /><br />Remarkably the cylinder walls are relatively free of scoring. <br /><br />I have the following questions about what you can see in the images<br /><br />1- what can I do to repair the top of the cylinder that is pitted with bits of the ring?<br /><br />2- is the black staining on the side of the pistons a bad sign?<br /><br />3- Do I need to have the block washed in some sort of cleaning solution to clean any little bits of aluminum out?<br /><br />4- on the deflector part of the pistions (the one not pitted with bits of ring) is the uneven, lava rock looking surface normal?<br /><br />This model of powerhead, the head does not separate. The tops of the cylinders are closed and there is only access to the waterjacket from the spark plug side (top? back of boat? that side)
