Hey,
I have a Yanmar 3gm in my Hughes 36. At idle, I can rev the engine right up to 3000rpm with no abnormal vibration. The same can be said for when the boat is in reverse. However, when I shift into forward I can only get up to around 1100rpm before I notice significant vibration and engine rocking.
I attempted to align the engine - I don't think its perfect yet, but I also haven't noticed a significant improvement.
Also, yesterday after putting it into reverse for a few minutes and then putting it into forward at slightly higher than usual rpm, the engine performed well in forward. This was until I decreased the rpms again, and then increased them, at which point the rocking vibration returned.
I'm wondering if you guys think it's just an alignment issue, cutlas bearing, transmission issue, spacer issue (there is a red, plastic looking spacer in between the prop shaft and engine), or if it could be something else entirely.
I should also note I only bought this boat recently, so I don't have an overly detailed history on it.
Thanks,
Nik
I have a Yanmar 3gm in my Hughes 36. At idle, I can rev the engine right up to 3000rpm with no abnormal vibration. The same can be said for when the boat is in reverse. However, when I shift into forward I can only get up to around 1100rpm before I notice significant vibration and engine rocking.
I attempted to align the engine - I don't think its perfect yet, but I also haven't noticed a significant improvement.
Also, yesterday after putting it into reverse for a few minutes and then putting it into forward at slightly higher than usual rpm, the engine performed well in forward. This was until I decreased the rpms again, and then increased them, at which point the rocking vibration returned.
I'm wondering if you guys think it's just an alignment issue, cutlas bearing, transmission issue, spacer issue (there is a red, plastic looking spacer in between the prop shaft and engine), or if it could be something else entirely.
I should also note I only bought this boat recently, so I don't have an overly detailed history on it.
Thanks,
Nik