Prop shaft run-out
06-24-2022, 10:08 PM
#1
Prop shaft run-out
What allowable runout for a standard Bravo prop shaft. Last weekend a submerged log jambed between the prop and cavitation plate. When I put it in reverse it stalled the motor instantly. Found the cavation plate broken. Checked the shaft and have .0035-.004 runout towards the end of the splines. Up close it's out about .002.
06-25-2022, 06:21 AM
#2
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Most say .005 is max, with .0035 or under preferable.
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Baja 252 Islander
Baja 252 Islander
06-26-2022, 07:36 AM
#7
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Originally Posted by thirdchildhood
Which leads us to the next question; Can it be straightened with a block of wood and a BFH?
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thirdchildhood (06-26-2022)
07-06-2022, 09:09 AM
#9
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This was our test for an insurance claim, was tested on the drive by the adjuster, he showed. 006, within spec, but did the test behind the splines, we pulled it apart, checked it as you see it, claim reversed
If it's out of spec, replace it, no way I would ever try to bend it back, you could damage bearings and a whole lot more trying to safe a few bucks
If it's out of spec, replace it, no way I would ever try to bend it back, you could damage bearings and a whole lot more trying to safe a few bucks
The following 5 users liked this post by blownhammer2000:
bajaman (07-25-2022), Brad Christy (07-26-2022), the deep (07-06-2022), ThisIsLivin (07-25-2022), underpsi68 (07-06-2022)
07-25-2022, 02:51 PM
#10
Registered
I would inspect your gears, you may have cracked a tooth. I had a similar situation, except no visible damage until you pulled the prop off. Inspected everything in the water after I felt a thump, no visible damage so I kept boating. Prop shaft and vertical shaft both had a twist in the splines. I found that out after the drive grenaded and I pulled it off to get repaired. Lesson learned, when you feel a thump, pull the prop.
