ryanm91
New member
Okay so after a year i finally found the time to do some diagnoising on my boat.
boat is a 1968 larson lapline with 289 interceptor and eaton outdrive (has volvo tag and appears to be a aq270)
Assuming the pds housing is a borg warner because it was single PDS bearing with pilot bushing.
Things done so far
replaced bellows (ujoint bellow was cracked)
replaced ujoints and they rotate freely
replaced single sealed PDS bearing and pilot bushing
inspected flexplate and coupler. no slop in any after reinstall of engine and pds housing.
youtube video of noise
https://www.youtube.com/watch?v=KUDiz30Fukw
This leads me to believe that something in the upper unit transmission has gone bad.
Does the vertical shaft spin in neutral? I assume the input bearing what the yoke rides on could be the culprit or chipped teeth. I guess what im asking does anything in lower unit spin in neutral.
Fluid was full and didn't have any metal shavings in it or water contamination.
I will admit besides ujoint bellow being cracked and ujoints were full of water one other thing that leads me to believe it is the transmission. The day before the noise appeared i was backing out of the dock and didn't have drive fully down. As much as i explained to my father that the only way to prevent the drive from drifting upwards in reverse is to have it full down so intermediate locks on the pin in the transom. The stern drive smacked upwards that day and i believe the conical bearing that the yoke rides on could be the issue or it chipped a tooth. The boat has had minimal run time since trying to diagnose the issue.
Am i on the right track that im probably looking at rebuilding the transmission? unit makes noise in gear and in neutral and doesn't matter on turning movements and noise is with drive in full down position.
Just looking for some guidance on where to investigate next.
boat is a 1968 larson lapline with 289 interceptor and eaton outdrive (has volvo tag and appears to be a aq270)
Assuming the pds housing is a borg warner because it was single PDS bearing with pilot bushing.
Things done so far
replaced bellows (ujoint bellow was cracked)
replaced ujoints and they rotate freely
replaced single sealed PDS bearing and pilot bushing
inspected flexplate and coupler. no slop in any after reinstall of engine and pds housing.
youtube video of noise
https://www.youtube.com/watch?v=KUDiz30Fukw
This leads me to believe that something in the upper unit transmission has gone bad.
Does the vertical shaft spin in neutral? I assume the input bearing what the yoke rides on could be the culprit or chipped teeth. I guess what im asking does anything in lower unit spin in neutral.
Fluid was full and didn't have any metal shavings in it or water contamination.
I will admit besides ujoint bellow being cracked and ujoints were full of water one other thing that leads me to believe it is the transmission. The day before the noise appeared i was backing out of the dock and didn't have drive fully down. As much as i explained to my father that the only way to prevent the drive from drifting upwards in reverse is to have it full down so intermediate locks on the pin in the transom. The stern drive smacked upwards that day and i believe the conical bearing that the yoke rides on could be the issue or it chipped a tooth. The boat has had minimal run time since trying to diagnose the issue.
Am i on the right track that im probably looking at rebuilding the transmission? unit makes noise in gear and in neutral and doesn't matter on turning movements and noise is with drive in full down position.
Just looking for some guidance on where to investigate next.