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Finished compression check of my 86 Merc 75Hp 2 cyc. motor
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<blockquote data-quote="DaveInGA" data-source="post: 162232" data-attributes="member: 166"><p>Got a battery and was able to complete a compression check on my 1986 Mercury 75 HP two cycle motor. I think I got lucky with this boat. Compression measurements are as follows:</p><p></p><p>Cylinder 1. 155 psi</p><p>Cylinder 2. 150 psi</p><p>Cylinder 3. 150 psi</p><p>Cylinder 4. 150 psi</p><p></p><p>That's a variance of between 3 and 4 percent tops. I had some variance I think due to how tight I screwed the compression tester into the cylinders. I suspect that may account for the 5 psi difference on Cylinder 1. In any case, it's well within the 10% and the over all compression levels seems to be real good. I'm happy.</p><p></p><p>I'm thinking I can remove the cables/controls and remove the motor from the boat so I can repair the transom.</p></blockquote><p></p>
[QUOTE="DaveInGA, post: 162232, member: 166"] Got a battery and was able to complete a compression check on my 1986 Mercury 75 HP two cycle motor. I think I got lucky with this boat. Compression measurements are as follows: Cylinder 1. 155 psi Cylinder 2. 150 psi Cylinder 3. 150 psi Cylinder 4. 150 psi That's a variance of between 3 and 4 percent tops. I had some variance I think due to how tight I screwed the compression tester into the cylinders. I suspect that may account for the 5 psi difference on Cylinder 1. In any case, it's well within the 10% and the over all compression levels seems to be real good. I'm happy. I'm thinking I can remove the cables/controls and remove the motor from the boat so I can repair the transom. [/QUOTE]
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Finished compression check of my 86 Merc 75Hp 2 cyc. motor
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