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Shaft key and keyway |
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Wilhelm Hertzog 
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Joined: June-14-2014 Location: Cape Town Status: Offline Points: 334 |
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 Topic: Shaft key and keywayPosted: January-28-2020 at 4:45pm |
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The key in my drive shaft coupler looks to me like it is made of key steel (not brass), and is showing some signs of corrosion. There is also some pitting of the edges of the aft end of the keyway.
 The key is short (doesn't fill the length of the entire keyway) but is held in place with a set screw coming through the coupler from above (the hole for the screw is visible in the picture), so it should be secure. Question: is that key still in good enough shape despite the signs of corrosion? As best I can tell, it doesn't look to me like the shaft and key are fretting, but am I wrong on this, and are the particles that look like rust in the keyway actually a sign of fretting? Thanks for any help! |
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: January-28-2020 at 5:05pm |
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Is the coupling still tight on the shaft? Unless you cleaned up the shaft at the bore of the coupling, I can't see any black smut that indicates fretting. I'd fix the strut, do the alignment and keep an eye on the coupling at the bore.
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Wilhelm Hertzog
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Joined: June-14-2014 Location: Cape Town Status: Offline Points: 334 |
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Posted: January-28-2020 at 5:50pm |
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Yes, coupling is tight, and no, I didn't clean up before the photo was taken. So I guess I'm good as far as that goes, thanks.
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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Wilhelm Hertzog
Senior Member
Joined: June-14-2014 Location: Cape Town Status: Offline Points: 334 |
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Posted: April-21-2020 at 7:16pm |
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Question on the shaft coupler set screws: should they get anti-seize, or thread locker? I've seen conflicting views on the topic on various boating forums.
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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Wilhelm Hertzog
Senior Member
Joined: June-14-2014 Location: Cape Town Status: Offline Points: 334 |
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Posted: April-29-2020 at 9:58am |
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: April-29-2020 at 10:05am |
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Typically nothing from the factory but, I'd use some blue (medium strength) thread locker on them. It will keep them in place and seal out moisture reducing corrosion. BTW, I've only seen the set screw loose when the coupling/shaft is fretted bad.
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Wilhelm Hertzog wrote: