F-32 Rudder Vibration

Larrys78 · Post by **Larrys78** » Thu Jan 20, 2011 7:10 pm

I own a 78 F-32 Twin 360s It seems I to have alot of vibration comming from the rudders between 10 and 14 kts. Shafts and props appear to have no vibration just the rudders.
Anybody else have this problem? Maybe some answers?

fourreins · Post by **fourreins** » Thu Jan 20, 2011 7:14 pm

possibly cutlass bearing...

Larrys78 · Post by **Larrys78** » Thu Jan 20, 2011 7:29 pm

Nope Check them both and they a wearing nice and even and in good shape

prowlersfish · Post by **prowlersfish** » Thu Jan 20, 2011 7:34 pm

do you have any toe in or out on the rudders ? 0 toe can cause the rudders to vibrate . are you sure its not a prop balance issue ? or engine alignment.

Larrys78 · Post by **Larrys78** » Thu Jan 20, 2011 8:02 pm

I don't think is an engine or prop issue. When I lay my hand on the shafts while running there seems to be very little vibration if any at all but when i lift the rear hatch the cross bar between the rudders is vibrating alot and when i lift up on it it seem to reduce the vibration. I don't know about the toe in toe out issue but what I did notice last time I had the boat in dry dock that the rudders both wiggle back and forth about a 1/4 of an inch on the rudder shafts, thought this was probable a normal thing since both rudders acted the same.

ready123 · Post by **ready123** » Thu Jan 20, 2011 10:25 pm

Larrys78 wrote:I don't know about the toe in toe out issue but what I did notice last time I had the boat in dry dock that the rudders both wiggle back and forth about a 1/4 of an inch on the rudder shafts, thought this was probable a normal thing since both rudders acted the same.

Here is the rudder alignment info:

The rudder blades are pressed onto the rudder shafts and should be a tight fit, they should not move on the shafts. Are you sure you are seeing play between blade and shaft or are you seeing play of the combination moving vs the linkage arm connection?

Larrys78 · Post by **Larrys78** » Sat Jan 22, 2011 9:04 pm

Thanks ill check it out
you wouldn't happen to have the diagram of the rudder linkage would you

ready123 · Post by **ready123** » Sat Jan 22, 2011 9:25 pm

Larrys78 wrote:Thanks ill check it out
you wouldn't happen to have the diagram of the rudder linkage would you

You can see it on the left edge, it is quite simple really each tiller arm is connected to a threaded rod (allowing for toe in adjustment) which is moved by the steering hydraulic piston/cylinder.

Larrys78 · Post by **Larrys78** » Sat Jan 22, 2011 11:09 pm

I've takn alook and seems there is alot of play where the cross bar attaches to the tiller arm i wondering if there is a bushing that is worn out or if the slop is normal

ready123 · Post by **ready123** » Sun Jan 23, 2011 1:47 am

Larrys78 wrote:I've takn alook and seems there is alot of play where the cross bar attaches to the tiller arm i wondering if there is a bushing that is worn out or if the slop is normal

What do you mean by alot? There will be some movement. Can you post a picture of that area?
Now there should be no movement between blade and the rod it is pressed onto... I thought you said you had some there?

Larrys78 · Post by **Larrys78** » Sun Jan 23, 2011 2:11 am

The boat is in the water so I can't at moment confirm that the rudders are moving on the shafts, thats what I thought I saw laat time I had the boat on Drydock. But i can confirm there is alot of play inside the boat where the rod that connects both rudders together can be moved back and forth about a 3/8 of an inch before it actualy moves the rutter tiller arm. the picure you had is same as my boat.

rossjo · Post by **rossjo** » Sun Jan 23, 2011 12:25 pm

So, your tiller is loose on the rudder shaft?

Larrys78 · Post by **Larrys78** » Sun Jan 23, 2011 5:17 pm

No the slop is where the 6 foot long cross bar connects both rudders together and is pinned or bolted to the ends of the tiller arms Iwould send a picture but can not figure out how with this program[/img]

ready123 · Post by **ready123** » Sun Jan 23, 2011 7:27 pm

Larrys78 wrote:No the slop is where the 6 foot long cross bar connects both rudders together and is pinned or bolted to the ends of the tiller arms Iwould send a picture but can not figure out how with this program[/img]

Put the image on an Internet site then place the URL to the image between the clicks of the image button above when composing.

k9th · Post by **k9th** » Sun Jan 23, 2011 9:26 pm

Welcome to the forum.