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OUPV 25 Ton
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Discussion Starter #1 (Edited)
So I went out for a sail today up to Lost Isle and caught a great sunset. The San Joaquin Delta has some of the best sunsets in my opinion. The wind died so I decided to fire up the iron jib and motor back. As I approached my Harbor entrance I slowed down and heard an awful rattling sound coming from what seemed like my transmission. I sped back up and the sound was gone. Slowed down again and there was that sound again. I'm thinking Wtf? So I get into my slip and put it in gear again at low idle and it's starts rattling again. Took off the engine cover and it seems to be my tranny making the noise, it goes away out of gear. Anyone have an idea what I'm dealing with? Throw out bearing possibly? It's a westerbeke 30 with a Paragon transmission and Walter V drive and yes the oil lvl is full.

Thanks
Smooth Sailing _/) _/)
Ron
 

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my first guess is the damper plate. it connects to the flywheel and dampens vibration to the transmission. there may be a inspection port where you can see in there but still may be hard to see if this is the problem
 

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OUPV 25 Ton
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Discussion Starter #4 (Edited)
my first guess is the damper plate. it connects to the flywheel and dampens vibration to the transmission. there may be a inspection port where you can see in there but still may be hard to see if this is the problem
Well it wasn't actually vibrating. Everything worked fine it was just rattling at low Rpm while it gear and it was pretty loud.
 

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i mentoned vibration only to describe what the purpose of the damper plate is
not to say that it would be vibrating now. broken springs in the damper plate can make a helacious noise and would be most likely to make the noise at idle
 

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OUPV 25 Ton
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Discussion Starter #6
i mentoned vibration only to describe what the purpose of the damper plate is
not to say that it would be vibrating now. broken springs in the damper plate can make a helacious noise and would be most likely to make the noise at idle
So would it still operate normally with broken springs?
 

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Get yourself a stethoscope with metal probe and listen at various points on the engine, transmission etc to isolate where the noise is coming from. You can also use a long screwdriver, broom handle etc instead go a stethoscope; hold the blunt end end tight to your (good if applicable) ear and probe with the other end. Just listening with an open engine cover can be deceiving. Be very careful that you don't get tangled up in anything that's moving ( pulley, belt, shaft etc) while probing.
 

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So I went out for a sail today up to Lost Isle and caught a great sunset. The San Joaquin Delta has some of the best sunsets in my opinion. The wind died so I decided to fire up the iron jib and motor back. As I approached my Harbor entrance I slowed down and heard an awful rattling sound coming from what seemed like my transmission. I sped back up and the sound was gone. Slowed down again and there was that sound again. I'm thinking Wtf? So I get into my slip and put it in gear again at low idle and it's starts rattling again. Took off the engine cover and it seems to be my tranny making the noise, it goes away out of gear. Anyone have an idea what I'm dealing with? Throw out bearing possibly? It's a westerbeke 30 with a Paragon transmission and Walter V drive and yes the oil lvl is full.

Thanks
Smooth Sailing _/) _/)
Ron
Sounds like a damper plate. They run under $200.00 clams but take many hours to replace.... Not difficult, about a 4 on a scale of 10, but can be awkward because the bell housing has to come off to access it..
 

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OUPV 25 Ton
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Discussion Starter #16
Don't want to sound too stupid here but check the prop and shaft for debris.
You know I was thinking that too, because I could hear it outside in the cockpit clearly. At first it sounded like it could be under the boat . Shivering thinking about getting into that water though.
I'll try it today.
 

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OUPV 25 Ton
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Discussion Starter #18

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Had the same symptoms with a propeller blade slightly damaged!
Damage was so small that not visible when diving !
A tiny damage on a blade can cause big vibrations at low rpm
 

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No. When the damping plate finally lets go, you lose all propulsion. I would strongly recommend checking it BEFORE running too much more (or at least before finding the cause of the problem). When ours blew, the springs sheared into many pieces and really banged around inside the engine. They lodged in the starter and burned out the starter, they tore up the bell housing, and they damaged the rear seal on the engine. It's really not the kind of thing you want to have happen when you're out, especially in bad weather.

While I certainly defer to MainSail's opinion, I'm a bit surprised that the damping plate would let go in the conditions you describe. I guess, once the metal is fatigued, it doesn't take much for it to break. I would have expected more violent conditions (e.g., sheets tangled in your prop, running the prop aground, lots of pounding due to steep chop, etc.) to have occurred at the same time.

I'll also tell you that getting the bell housing off on my engine (Universal M16) wasn't the easiest thing in the world, in part due to the way my engine compartment was laid out. It was easier to disconnect the engine and move it out of the engine compartment than to try to work on it in place. In the end, I chickened out and let the marina do the work.
 
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