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Old 09-08-2014, 04:39 PM
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Forrest-X45 Forrest-X45 is offline
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Hot Prop Shaft Strut Brace

I noticed my prop shaft strut had steam coming off it while drying the boat off this weekend after coming off the water. So I carefully touched it to see what was causing the steam I had never seen before and it was hot to the touch where the prop shaft runs through. The prop shaft turns normally with no restriction and the boat performed normally on the water. I don't know if this normal since it felt pretty hot and I have never seen the steam before.

Any ideas of what could be causing the heat? Boat is a 2008 X-45.
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Old 09-08-2014, 04:41 PM
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What year x45 - may have slight misalignment...there should be enough water flowing thru to lubricate.. did was boat in gear turning while pulling boat up on trailer? would not take too many revolutions to get warm
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Old 09-08-2014, 04:50 PM
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Forrest-X45 Forrest-X45 is offline
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That's what I thought as well, Mike. There should be enough water flowing through to keep it cool. The boat is a 2008 as stated in my first post and the engine is always shut off before pulling out of the water.

There are just the plastic bushings in the strut housing, correct? Or are there other materials in there that would fail and cause the temperature issue?
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Old 09-08-2014, 05:49 PM
FrankSchwab FrankSchwab is offline
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Wow, it's hard to imagine the strut getting that hot while it's completely surrounded with water.

It's a pretty simple mechanism, two Delrin plastic sleeves touch the propshaft and that's about it.

Perhaps you hit something that bent the strut, creating huge amounts of friction when driving? How hard is it to turn your prop out of the water? If you stand 20 feet behind the boat and look at the strut, does it have any kind of bend in it?
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Old 09-10-2014, 02:44 PM
88 PS190 88 PS190 is offline
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Wild thought.

What shaft seal do you have?

An OJ? https://www.bakesonline.com/detail.aspx?ID=2182

Many of the "dripless" shaft seal systems have a line from the engine to push water through them.

My guess would be that your engine's cooling system is hooked up to provide a water supply to the shaft seal - and that this supply is probably in a "hot" line.

As such you pull it up, hot engine water runs down the shaft from the seal over the strut, showing steam and feeling warm.



Thoughts?
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Old 09-12-2014, 01:15 AM
88 PS190 88 PS190 is offline
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Still curious, run the boat again? Or check the plumbing?
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Old 09-14-2014, 01:51 AM
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Eagle Lake Rebel Eagle Lake Rebel is offline
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The shaft seal uses engine water to cool it which runs 160f. When out of the water this cooling water runs down the shaft and on the strut which heats it up. This is normal, don't worry about it.


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Old 09-15-2014, 05:55 PM
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Forrest-X45 Forrest-X45 is offline
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Thanks for the responses. I didn't make it out this past weekend to see if the situation repro'ed. I always notice the warm water running down the prop shaft and out of the shaft seal but have never noticed the steam. It just concerned me since I haven't seen the steam before. Maybe the cooler air temp that morning aided in the steam production from the warm water running down the shaft??? Everything seems to be in order and running properly so maybe it was just a temperature difference. I will keep an eye on it and maybe even have the dealer take a look at an alignment.
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Old 09-16-2014, 10:27 PM
88 PS190 88 PS190 is offline
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IMO - if your prop spins freely and the bushing doesn't feel worn out, you are in alignment close enough for gov't work.
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