Propshaft Runout
#1
Registered
Thread Starter
Propshaft Runout
Back on Labor Day weekend I struck something (due to low water levels). The prop suffered pretty major damage and is being sent off to BBlades for rework. With the damage to the prop I assumed there would be prop shaft damage as well. To get through the Labor day weekend, I heated the prop up and beat it back into a usable shape.. much to my surprise, there wasn't much vibration and the boat performed rather well.... The boat hasn't been used since..... I pulled the boat out of storage today and measured the runout on the prop shaft. I measured a total of .010" of runout. While .010" isn't that much, I assume it is too much for a prop shaft....... So my question is, what is an acceptable amount of run out for a Bravo 1 prop shaft?
The lower unit on my boat is an SEI unit and it has a 3 year no questions asked damage warranty so I plan to send it in. However, I don't want to send it in of .010" is within tolerance (I am guessing its not...)
The lower unit on my boat is an SEI unit and it has a 3 year no questions asked damage warranty so I plan to send it in. However, I don't want to send it in of .010" is within tolerance (I am guessing its not...)
#2
Registered
Join Date: Nov 2001
Location: Pennsylvania
Posts: 3,385
Likes: 0
Received 0 Likes
on
0 Posts
Back on Labor Day weekend I struck something (due to low water levels). The prop suffered pretty major damage and is being sent off to BBlades for rework. With the damage to the prop I assumed there would be prop shaft damage as well. To get through the Labor day weekend, I heated the prop up and beat it back into a usable shape.. much to my surprise, there wasn't much vibration and the boat performed rather well.... The boat hasn't been used since..... I pulled the boat out of storage today and measured the runout on the prop shaft. I measured a total of .010" of runout. While .010" isn't that much, I assume it is too much for a prop shaft....... So my question is, what is an acceptable amount of run out for a Bravo 1 prop shaft?
The lower unit on my boat is an SEI unit and it has a 3 year no questions asked damage warranty so I plan to send it in. However, I don't want to send it in of .010" is within tolerance (I am guessing its not...)
The lower unit on my boat is an SEI unit and it has a 3 year no questions asked damage warranty so I plan to send it in. However, I don't want to send it in of .010" is within tolerance (I am guessing its not...)
#4
Registered
Join Date: Nov 2001
Location: Pennsylvania
Posts: 3,385
Likes: 0
Received 0 Likes
on
0 Posts
Quite frankly if the splines were straight and I owned the lower with no warrantee, I'd give it a whack with a dead blow to get it under .005. Been there, done that, worked just fine. It is twist in propshaft splines that make them weak.
#5
Registered
Thread Starter
Spines are straight. I was at idle when I struck what ever it was. It actually shut the boat off...... If the lower wasn't covered by a no questions asked warranty, I would probably take a shot at straightening it.... But since it is, all I have to do is pay shipping to get it replaced.
#6
Registered
whats the harm in trying the hammer trick,if you make it worse,send it in,if you make it better,go boating.
#7
Registered
Thread Starter
It is freezing cold still here in MI. The lower has a three year warranty that began may, 3years ago... since the season has not started here in MI yet, no sense in not using this time to send the drive in.... The more I think about it, with as much damage as my prop saw, there may be more hidden damage inside the lower..........
#9
Registered
Thread Starter
Yup. I am guessing it was a big freaking rock. What probably saved more damage to the drive is the fact that I am running a labbed prop. Had it not been labbed (thinned) I would guess the drive would have suffered more damage. The prop ended up with one blade folded over about 3" in from the tip. Another blade suffered a very large gouge.
Last edited by low_psi; 04-13-2013 at 10:53 PM.