Dr. Velocity
Cadet
- Joined
- Jul 24, 2007
- Messages
- 24
Boat: 1982 Bayliner 19' Capri
Engine: Volvo AQ125A (tired and old!)
Stern Drive: Volvo 270
After getting the engine to run well, we had some decent times in the boat. However, a higher pitched whine started to develop and it's gradually become louder. As far as I can tell, it emanates from the rear of the engine bay (closest to the transom). It increases in pitch with engine speed regardless of whether the drive is in forward, neutral, or reverse. It is not dependent on engine temperature either - from the second the boat is started, the noise begins. It does not go away with higher engine speeds.
I checked the oil in the drive and it is murky white in color. I'm not sure that the oil has ever been changed. I'll be changing it later today (have to find an impact wrench with a flat head bit as the oil drain plug won't budge).
Also, we have one other problem associated with the drive. After giving the boat slight throttle with the drive in forward, the drive propels the boat decently. However, after a few seconds and often depending on engine speed (usually happens around 1900 rpm), we'll feel a hard thump and the boat surges forward for a split second - engine speed does not change.
I was starting to suspect the manual trim mechanism, as the the catch does not engage when in reverse or forward. When reversing, the drive bounces up and down. Me theory was/is that when there is enough force on the drive against the transom while moving forwards, the catch finally grabs the trim bar.
Due to recent storms, our peer broke and the transom rotated towards a rocky shore. The prop is pretty dinged up and I suspect the rocks had their way with the lower unit, but there isn't much damage that would suggest this.
Any and all help is much appreciated. The end of the season is drawing near, but we're trying to get the most out of this boat as possible. Thanks in advance.
Engine: Volvo AQ125A (tired and old!)
Stern Drive: Volvo 270
After getting the engine to run well, we had some decent times in the boat. However, a higher pitched whine started to develop and it's gradually become louder. As far as I can tell, it emanates from the rear of the engine bay (closest to the transom). It increases in pitch with engine speed regardless of whether the drive is in forward, neutral, or reverse. It is not dependent on engine temperature either - from the second the boat is started, the noise begins. It does not go away with higher engine speeds.
I checked the oil in the drive and it is murky white in color. I'm not sure that the oil has ever been changed. I'll be changing it later today (have to find an impact wrench with a flat head bit as the oil drain plug won't budge).
Also, we have one other problem associated with the drive. After giving the boat slight throttle with the drive in forward, the drive propels the boat decently. However, after a few seconds and often depending on engine speed (usually happens around 1900 rpm), we'll feel a hard thump and the boat surges forward for a split second - engine speed does not change.
I was starting to suspect the manual trim mechanism, as the the catch does not engage when in reverse or forward. When reversing, the drive bounces up and down. Me theory was/is that when there is enough force on the drive against the transom while moving forwards, the catch finally grabs the trim bar.
Due to recent storms, our peer broke and the transom rotated towards a rocky shore. The prop is pretty dinged up and I suspect the rocks had their way with the lower unit, but there isn't much damage that would suggest this.
Any and all help is much appreciated. The end of the season is drawing near, but we're trying to get the most out of this boat as possible. Thanks in advance.
