Hunter 326 - Yanmar Engine Vibration - New mounts and maybe more??

[Breezy1]

Here's where I got mine. Price varies with material chosen. Don't forget to have the new coupling fit and faced to the shaft.

Stainless Steel Inboard Propeller Shafts | Deep Blue Yacht Supply

Order stainless steel inboard propeller shafts from Deep Blue Yacht Supply. Our Aqualoy propeller shafts undergo more quality controls than any other brand!

www.deepblueyachtsupply.com

Perfect. Thank you - they have a much better selection. Buck Algonquin!! That was a name that was given to me to look up and when I googled it, the results were deepblue......!

 

[Breezy1]

Well.....It's been a while but I have had good results. To summarize - the prop and shaft were all good. The cutlass was worn in such a manner that the engine was low. The cutlass was worn on the bottom end facing the bow and the top end facing the stern. I took one mount off and it was pliable and seemed fine so I figured I'd take my chances and realign with the old mounts.
Once I replaced the cutlass and centered the shaft going into the shaft log, I found the engine needed to be raised approx 1/4". I adjusted the mounts to accommodate, aligned coupler to .010" and bolted it back together. I wanted to install a flex coupler to help the situation however there isn't enough clearance to do so.

Put her in the water several weeks ago, fingers crossed, the vibration and cluncking are gone!! Let's see how long it lasts!
Thanks for all of your help and advice!!

Oh - I can't seem to find the post with the link to all the Hunter 326 manuals! I thought I bookmarked it but if anyone has it please reply! Thank you all again!
Smooth Sailing,
Ken

 

[kappykaplan]

Oh - I can't seem to find the post with the link to all the Hunter 326 manuals!

Hunter resources, by model

Hunter resources, by model

hunter.sailboatowners.com

 

[Ralph Johnstone]

I adjusted the mounts to accommodate, aligned coupler to .010" and bolted it back together.

So I guess what you're saying is that you didn't read the article on shaft alignment. Actually, I'm quite surprised that it's that far out of alignment now and you find it running much better than before :

Put her in the water several weeks ago, fingers crossed, the vibration and cluncking are gone!!

It must have been really rough before.

Let's see how long it lasts!

Yes, I think that's where you'll be disappointed after a few years.

 

[Breezy1]

So I guess what you're saying is that you didn't read the article on shaft alignment. Actually, I'm quite surprised that it's that far out of alignment now and you find it running much better than before :

I'm not exactly sure what you mean, I'm nearly in perfect alignment now. What I meant to say is that I used a .010 feeler gauge all around the coupling for adjustment and it was near perfect.


It must have been really rough before.

Yes! It was horrible at 1800 RPM - it must have been a resonant frequency of the system with it out of alignment.


Yes, I think that's where you'll be disappointed after a few years.

Probably - but I'll worry about that in a few years. lol

 

[Ralph Johnstone]

"I'm not exactly sure what you mean, I'm nearly in perfect alignment now. What I meant to say is that I used a .010 feeler gauge all around the coupling for adjustment and it was near perfect."

What a difference a few words make.

"Yes, I think that's where you'll be disappointed after a few years.

Probably - but I'll worry about that in a few years. lol"

If you've aligned your two couplings to within 0.004" angularity on, I'm guessing 4" flanges, you should be in good shape for many years to come.
My first alignment from brand new was from around 0.010" down to 0.002" and I've only made two adjustment in 24 years to keep it as close to 0.002" as I can. It doesn't change much and then very slowly as it does so.