chs marine service
Petty Officer 3rd Class
- Joined
- Jun 29, 2019
- Messages
- 89
i have this 2013 yamaha 90hp that has a knockign sound in the area above the lower unit, i recorded it an here is a video.
photos.app.goo.gl
i pulled the lower section and the noise is no longer present and i spection found that the driveshaft is
1: rusty
2 has a very shiney spot about 6.5" up which corrospinds to the area that a bushing sits in the upper unit
do you think the rusted driveshaft should be addressed? do you think replacing the bushing will resolve the knock? do you think the shiny area on the shaft indicates the shaft is smaller from the wear?
thanks for any help on this
![1721243195456.png 1721243195456.png](https://forums.iboats.com/data/attachments/400/400582-16221a73aff7fd1a3771ed13c45fc415.jpg)
![1721243170847.png 1721243170847.png](https://forums.iboats.com/data/attachments/400/400581-770e15655fbe238d89d8e3a48858dbcc.jpg)
![1721243222983.png 1721243222983.png](https://forums.iboats.com/data/attachments/400/400583-c99ea360d55ed0140af41d603c29b79e.jpg)
New video by Paul Evans
i pulled the lower section and the noise is no longer present and i spection found that the driveshaft is
1: rusty
2 has a very shiney spot about 6.5" up which corrospinds to the area that a bushing sits in the upper unit
do you think the rusted driveshaft should be addressed? do you think replacing the bushing will resolve the knock? do you think the shiny area on the shaft indicates the shaft is smaller from the wear?
thanks for any help on this
![1721243195456.png 1721243195456.png](https://forums.iboats.com/data/attachments/400/400582-16221a73aff7fd1a3771ed13c45fc415.jpg)
![1721243170847.png 1721243170847.png](https://forums.iboats.com/data/attachments/400/400581-770e15655fbe238d89d8e3a48858dbcc.jpg)
![1721243222983.png 1721243222983.png](https://forums.iboats.com/data/attachments/400/400583-c99ea360d55ed0140af41d603c29b79e.jpg)