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Old 01-06-2019, 08:20 PM   #1
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Gibble bearing

Quick question, the gibble bearing on our 30' Sundowner was replaced in 2015, yesterday on a 5 hr. cruise we took a temperature with a heat gun. The shaft was 98 on the forward side of the bearing, the stern side was 103, the housing of the bearing itself was 122, does that fall within "normal"?
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Old 01-06-2019, 08:27 PM   #2
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What is a gibble bearing? Never heard that term except to mean something wrecked or damaged. Hope you haven't gibbled your shaft.

Do you mean the prop shaft stuffing box? Those temps sound alright to me for the stuffing/packing box. As a general guidline if you can hold your hand on the metal part of the stuffing box then the temp is ok.
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Old 01-06-2019, 08:34 PM   #3
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Originally Posted by C lectric View Post
What is a gibble bearing? Never heard that term except to mean something wrecked or damaged. Hope you haven't gibbled your shaft.

Do you mean the prop shaft stuffing box? Those temps sound alright to me for the stuffing/packing box. As a general guidline if you can hold your hand on the metal part of the stuffing box then the temp is ok.
My understanding is the gibble bearing is the bearing that supports the middle of the shaft inside the boat the stuffing housing measured 86.
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Old 01-06-2019, 08:34 PM   #4
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Gimble bearing.
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Old 01-06-2019, 08:37 PM   #5
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Thanks for correcting me!
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Old 01-06-2019, 08:52 PM   #6
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No such thing as a gibble or gimble bearing.

A "gimbal" is a bearing that allows something to tilt or swing to stay level such as some a gimballed stove, some gimballed compass bearings or an i/o drive to tilt etc.

I can't see why you would have one of these on your shaft unless your shaft was in two pieces and it was somehow tied in with a universal joint ... something like the old "dis-pro (disappearing propeller) boats

I suspect you mean a pillow block bearing but given your limited description I wouldn't bet on that because I've never seen a Sundowner 30 with a pillow block bearing either as thee shaft is too short to need one.

I suggest you Google these terms and let us know what you are talking about.
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Old 01-06-2019, 09:00 PM   #7
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Sounds like a Sundancer with an IO and a gimbal bearing which makes sense.
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Old 01-06-2019, 09:10 PM   #8
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Sounds like a Sundancer with an IO and a gimbal bearing which makes sense.
Don't think so. An i/o does not have a stuffing box and no way to feel the temp of the shaft.
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Old 01-06-2019, 09:31 PM   #9
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Gibble bearing

Here's a picture of the bearing I am referring to located 1/2 way between engine and the hacking housingClick image for larger version

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Old 01-06-2019, 09:59 PM   #10
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The temps are well within a safe temperature range. As long as the bearing has proper grease.

If you want to lower the temps, try this grease from Archoil. They are leaders in nano lubrication. Your bearing will spin easier and cooler. I use most of their products.
https://www.archoil.com/collections/...12421963350098
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Old 01-06-2019, 10:35 PM   #11
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Agree gimble bearings are in stern drives. Maybe a photo of the bearing you are talking about.
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Old 01-07-2019, 12:55 AM   #12
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Turner,

Found this in a google search...

https://www.sailangle.com/group-foru...ge/1/sort/desc

Its an old discussion about a pillow block bearing on Sundowner 30's and whether it is needed due to the length of unsupported shaft. Don't know whether I'd recommend removing it, but it looks like others have had concerns about them.
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Old 01-07-2019, 08:24 AM   #13
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Quote:
Originally Posted by Lepke View Post
The temps are well within a safe temperature range. As long as the bearing has proper grease.

If you want to lower the temps, try this grease from Archoil. They are leaders in nano lubrication. Your bearing will spin easier and cooler. I use most of their products.
https://www.archoil.com/collections/...12421963350098
Good suggestion and reassuring comment on temperature. The temps didn't seem to be bad, just wanted thoughts from the forum. As a group the TF people provide so much knowledge to each other. Thanks.
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Old 01-07-2019, 08:46 AM   #14
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Put an automatic grease system on like this (McMaster Carr) and you won't have to worry about it.

I put one of these on my "ex" an old 34 Mainship as the fitting was hard to get to. I used a length of hydraulic hose to get it to a handy location.

I also had on of those go bad...it squeaked (when I went into reverse) and rumbled. If it's quiet don't worry about it.
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Old 01-07-2019, 09:03 AM   #15
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Based on the input I've received I've decided that all is well for now. Maybe we are just over thinking, we just installed a new Beta Marine engine and making sure we don't neglect a problem if there is one.
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Old 01-07-2019, 09:33 AM   #16
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If the engine is new and the bushing was not hot prior to the new installation, perhaps there is an alignment issue? When the work was performed was alignment checked on the hard or in the water? Having the hull supported by blocks in a few locations is very different from being supported by water.
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Old 01-07-2019, 04:04 PM   #17
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Late I see.
My BIL had a 30 Sundowner and that boat had the bearing in the picture.
I called it an intermediate bearing although the type was a pillow block.
We would grease it once a year with a waterproof lithium based grease.

As discussed the temps are OK, Good.
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Old 01-07-2019, 04:09 PM   #18
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How are the muffler bearings?
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Old 01-07-2019, 06:40 PM   #19
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Quote:
Originally Posted by Turner View Post
Here's a picture of the bearing I am referring to located 1/2 way between engine and the hacking housingAttachment 83966

That appears to be a "self aligning pillow block steady bearing".
The self aligning happens because the actual ball/roller cage can gimbal within the cast iron pillow,allowing the ball/roller cage to automatically align squarely with the shaft longitudinally.
There are 4 bolt/nut jacks to allow the whole assembly to be raised/lowered/moved sideways to align with the shaft centerline.
From your description,I don't believe you have any problem with it at present.Grease it once or twice a year. / Len


link to an example of the older style non-self aligning babbit steady bearing
https://www.marinesource.ca/products...-bearing-1-1-2
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Old 01-07-2019, 06:49 PM   #20
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Originally Posted by deblen View Post
That appears to be a "self aligning pillow block steady bearing".
The self aligning happens because the actual ball/roller cage can gimbal within the cast iron pillow,allowing the ball/roller cage to automatically align squarely with the shaft longitudinally.
There are 4 bolt/nut jacks to allow the whole assembly to be raised/lowered/moved sideways to align with the shaft centerline.
From your description,I don't believe you have any problem with it at present.Grease it once or twice a year. / Len


link to an example of the older style non-self aligning babbit steady bearing
https://www.marinesource.ca/products...-bearing-1-1-2
Really appreciate all the info you provided! The longer I'm on this site the more I learn and the more I realize how much more there is to learn, thanks.
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