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1997 Mercury 40/30 jet
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<blockquote data-quote="rktman" data-source="post: 422927" data-attributes="member: 11818"><p>I just picked up a 97 Merc 40 / 30 jet that came with a boat hull I "needed".</p><p></p><p>The motor was reportedly low on compression and was priced accordingly (cheap).</p><p></p><p>I tested the compression myself. Cylinders 1, 2, & 4 were OK with 120, 115, and 118 psi respectively.</p><p>The No. 3 cylinder only had 20 psi, yes 20 psi.</p><p></p><p>My next step will obviously be to pull the head and see whats happening. Hopefully it will just be a blown head gasket.</p><p></p><p>If its more than a head gasket, would this motor be worth the effort to rebuild and are they fairly reliable?</p></blockquote><p></p>
[QUOTE="rktman, post: 422927, member: 11818"] I just picked up a 97 Merc 40 / 30 jet that came with a boat hull I "needed". The motor was reportedly low on compression and was priced accordingly (cheap). I tested the compression myself. Cylinders 1, 2, & 4 were OK with 120, 115, and 118 psi respectively. The No. 3 cylinder only had 20 psi, yes 20 psi. My next step will obviously be to pull the head and see whats happening. Hopefully it will just be a blown head gasket. If its more than a head gasket, would this motor be worth the effort to rebuild and are they fairly reliable? [/QUOTE]
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1997 Mercury 40/30 jet
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