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Old 25-07-2017, 19:30   #1
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What is the Name of the Tool to Remove this Nut?

Is there an off-the-shelf tool that is correct for this style of nut; if so, what is it called? It is on a Yanmar YSE8.

You can see my cold chisel has proved ineffectual so far and I figured it was a good time to stop and reconsider my options. Penetrating oils, rust "dissolvers" and gentle heat have already been applied.

You will note that it is recessed into the pulley hub so a socket style tool seems appropriate. I'm not ready to buy some Yanmar specific tool but might have to consider making a custom tool if the CF gurus can't advise a better option.
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Old 25-07-2017, 19:43   #2
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Re: What is the Name of the Tool to Remove this Nut?

First thing, though, would be to follow the threads from the very beginning at the top and verify it is not a reverse thread.

The tool ? Wouldn't know. But stubborn exhaust manifold bolts as well as seized carburetor bolts(aluminum) have been removed by putting the whole thing in the freezer and working gradually. The freezer was a last resort after, like your pulley, heat and all the penetrating oils were used.

Good luck.
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Old 25-07-2017, 19:57   #3
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Re: What is the Name of the Tool to Remove this Nut?

Is Yanmar not helpful in questions like this?
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Old 25-07-2017, 20:04   #4
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Re: What is the Name of the Tool to Remove this Nut?

"Gentle" heat won't work, to break a corrosion bond requires a very hot concentrated heat source of heat. An aceteline torch or at least a MAP gas torch would be more appropriate, rapid heat on a concentrated area will usually do the trick. But if there are rubber gaskets or hub bushings that's not an option. Freezer suggestion sounds like a good alternative.
However, if there are no rubber parts and it's a steel hub with a frozen nut, poor the heat on the nut hard and heavy until it is smoking hot, then try to remove it. Your trying to make the nut expand faster than the threaded shaft it's on to break the corrosion / torque bond it's stuck on with. Slow heat tends to expand the nut and the shaft with no dimensional advantage.
I worked in spinning mills in high school that used 1850's vintage equipment, then into working as a millwright in chemical plants, in both cases I took apart some extremely corrosion bonded parts.
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Old 25-07-2017, 20:05   #5
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Re: What is the Name of the Tool to Remove this Nut?

Hello,

What is the pulley that is held by the nut used for? Water pump?
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Old 25-07-2017, 20:12   #6
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Re: What is the Name of the Tool to Remove this Nut?

Worst case, use a dremel... I can cut that off in about 20 minutes. Once cut in half, use a chisel and hammer. Replace with a grade 8 regular nut.


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Old 25-07-2017, 20:19   #7
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Re: What is the Name of the Tool to Remove this Nut?

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Originally Posted by Three Sisters View Post
First thing, though, would be to follow the threads from the very beginning at the top and verify it is not a reverse thread.

........
Good luck.
The thread direction appears to standard (i.e. RH); at least to my eyes!
The rotation of the pulley is CCW
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Old 25-07-2017, 20:22   #8
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Re: What is the Name of the Tool to Remove this Nut?

In this case as well as rounded nuts I would use a gator grip socket and breaker bar.
https://www.amazon.com/Original-Univ.../dp/B000065CJ8
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Old 25-07-2017, 20:24   #9
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Re: What is the Name of the Tool to Remove this Nut?

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Originally Posted by redbeard1 View Post
Hello,

What is the pulley that is held by the nut used for? Water pump?
Alternator & water pump">raw water pump.
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Old 25-07-2017, 20:26   #10
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Re: What is the Name of the Tool to Remove this Nut?

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Originally Posted by Wotname View Post
The thread direction appears to standard (i.e. RH); at least to my eyes!
Might sound silly but what are you attempting to undo it from, that is to say are you securing the pulley and trying to undo the nut or are you securing the shaft and trying to undo the nut from it, perhaps removing pulley at the same time.
As I said, may sound silly.
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Old 25-07-2017, 20:30   #11
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Re: What is the Name of the Tool to Remove this Nut?

May help http://www.boatservicehaarlem.nl/man...ar-yse8-12.pdf

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Old 25-07-2017, 20:32   #12
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Re: What is the Name of the Tool to Remove this Nut?

Quote:
Originally Posted by meatservo View Post
Worst case, use a dremel... I can cut that off in about 20 minutes. Once cut in half, use a chisel and hammer. Replace with a grade 8 regular nut.


meatservo

I'm hoping for better than worst case but yes, that will work - if push comes to shove!
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Old 25-07-2017, 20:42   #13
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Re: What is the Name of the Tool to Remove this Nut?

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Originally Posted by newhaul View Post
In this case as well as rounded nuts I would use a gator grip socket and breaker bar.
https://www.amazon.com/Original-Univ.../dp/B000065CJ8
Hmm... yes, this is a tool that might work. The OD of the nut 1.25" and I note the largest Gator Grip is good for 1.25"; presumably that is 1.25" AF, so it should fit.
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Old 25-07-2017, 20:44   #14
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Re: What is the Name of the Tool to Remove this Nut?

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Originally Posted by Uncle Bob View Post
Might sound silly but what are you attempting to undo it from, that is to say are you securing the pulley and trying to undo the nut or are you securing the shaft and trying to undo the nut from it, perhaps removing pulley at the same time.
As I said, may sound silly.
No, not silly as it does make a difference IME.
I'm securing the shaft and trying to undo the nut from it, perhaps removing pulley at the same time.
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Old 25-07-2017, 20:46   #15
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Re: What is the Name of the Tool to Remove this Nut?

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Originally Posted by deblen View Post
Thanks, I do have this manual but unfortunately it doesn't make any mention of any special tooling for this nut.
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