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18 hp Johnson - 1961 - Mark on top end of cylinder
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<blockquote data-quote="kofkorn" data-source="post: 393477" data-attributes="member: 7076"><p>Those two marks are above where the piston rings travel, which is good. Check to make sure you can't feel a pronounced bump into the cylinder bore. I doubt they are high enough to cause any contact with the piston. Additonally, it doesn't look like there was a gasket leak around them. </p><p></p><p>Then check to make sure that they don't stick up beyond the face of the cylinder (toward the head). </p><p></p><p>Dress the whole area with a piece of 400 grit sandpaper adhered to a small piece of glass (more consistent than wood) and clean the whole top surface of the cylinder block. </p><p></p><p>Put a new head gasket in place and you should be good to go. </p><p></p><p>Let us know where the compression lands afterward. </p><p></p><p>Good luck!</p></blockquote><p></p>
[QUOTE="kofkorn, post: 393477, member: 7076"] Those two marks are above where the piston rings travel, which is good. Check to make sure you can't feel a pronounced bump into the cylinder bore. I doubt they are high enough to cause any contact with the piston. Additonally, it doesn't look like there was a gasket leak around them. Then check to make sure that they don't stick up beyond the face of the cylinder (toward the head). Dress the whole area with a piece of 400 grit sandpaper adhered to a small piece of glass (more consistent than wood) and clean the whole top surface of the cylinder block. Put a new head gasket in place and you should be good to go. Let us know where the compression lands afterward. Good luck! [/QUOTE]
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18 hp Johnson - 1961 - Mark on top end of cylinder
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