Ok, so the above transmission
has been flawless for me for about ten years. No problems whatsoever. A couple of months ago, there was a pronounced growling and accompanying vibration at higher RPM's that has persisted until today. At first I thought it was a bad bushing or maybe even a bent prop (the noise
originally sounded like it was coming from near the bushing/hull area), but when I was motoring for a few hours the other day (at low RPM's, getting maybe 4.5knots), I accidentally grounded on mud. I put it into reverse, revved it up to maybe 2,000 RPMS and I got myself unstuck.
The catch is that the vibration and noise
seemed to disappear while I was in reverse. I wasn't positive that it had disappeared, because I was acting a bit hastily to get off the ground, but the same thing happened a few days later when I got myself stuck in a bit of mud in a local bay with which I was unfamiliar. So, I put it into reverse and backed off, and again..no growling or vibration that I could notice.
So far, the problem only seems
to occur in forward gear
, and it gets progressively worse the higher the RPM's go, starting as an angry growl and becoming a full-on vibration around 1800 RPM
. I'm stupid on motors, so any advice is appreciated. Things I've done so far:
-Visually inspected the prop underwater. It doesn't look like it's bent, to my eyes.
-Checked fluid levels on the transmission
. The fluid on the stick is the proper clearish/red color that it is when new, and the level is right where it should be at, according to the stick.
I'm not convinced it is the transmission for certain, and I'm also not 100% sure that the problem disappears entirely in reverse (although I'm between 80-90% sure that it does) because my total time in reverse has been less than one minute since noticing the problem. Sorry for such a vague question/post, but I'm simply no expert on diesel
motors and/or their transmissions, so it casts all kinds of doubt.