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1999 Mercury 9.9ml lower end problem
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<blockquote data-quote="Pappy" data-source="post: 394721" data-attributes="member: 3278"><p>Lack of proper servicing (lack of grease on the splines and no way to keep the grease in place) was probably the root cause however, to answer your thought process, even though they are "both built out of steel" they are very different steels! One is hardened and designed to live under very different loads than the other. The failure actually happened as it was designed to happen. </p><p>Another remote possibility for your failure if your splines are stripped on the driveshaft is that the exhaust housing is slightly bent. Without proper tooling and measuring equipment the only way to check for this is to pull your powerhead, install the lower unit with driveshaft and see where the top of the driveshaft is. If centered, great....if not, not so good.</p></blockquote><p></p>
[QUOTE="Pappy, post: 394721, member: 3278"] Lack of proper servicing (lack of grease on the splines and no way to keep the grease in place) was probably the root cause however, to answer your thought process, even though they are "both built out of steel" they are very different steels! One is hardened and designed to live under very different loads than the other. The failure actually happened as it was designed to happen. Another remote possibility for your failure if your splines are stripped on the driveshaft is that the exhaust housing is slightly bent. Without proper tooling and measuring equipment the only way to check for this is to pull your powerhead, install the lower unit with driveshaft and see where the top of the driveshaft is. If centered, great....if not, not so good. [/QUOTE]
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1999 Mercury 9.9ml lower end problem
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