thrust bearings

[steveo]

who here is running these bearings on the motor

[Rumdog]

A lot of people do. With some motors it is unnecessary.

[BHChieftain]

A lot of people do. With some motors it is unnecessary.

Which motor types don't really need these?

Chief

[Fluid]

A thrust bearing is not required on the "real" Neu motors because their bearings are designed to take axial thrust, and because their end bells are pinned in place. Plus it is almost impossible to get the correct pre-load on a thrust bearing with the lack of axial play on the Neus.

Thrust bearings are not a bad idea on the Feigao motors and other with glued endbells. There is enough end play on these motors to allow correct adjustment of the thrust bearings.


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[BHChieftain]

A thrust bearing is not required on the "real" Neu motors because their bearings are designed to take axial thrust, and because their end bells are pinned in place. Plus it is almost impossible to get the correct pre-load on a thrust bearing with the lack of axial play on the Neus.

Thrust bearings are not a bad idea on the Feigao motors and other with glued endbells. There is enough end play on these motors to allow correct adjustment of the thrust bearings.


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What do you think about the castle creations motors? I have a new cc1518 and in order to get the couper to sit snug against a thrust bearing will cause me a lot of rework... which I'm happy to avoid...

I have a neu 1515 and noticed there is hardly any axial play, while there is quite a bit on the cc1518.

One other question-- if there is too much space between the coupler and the bell housing, would it be ok to install 2 thrust bearings toghether to fill the gap?

Chief

[JMSCARD]

A thrust bearing is not required on the "real" Neu motors because their bearings are designed to take axial thrust, and because their end bells are pinned in place. Plus it is almost impossible to get the correct pre-load on a thrust bearing with the lack of axial play on the Neus.

Thrust bearings are not a bad idea on the Feigao motors and other with glued endbells. There is enough end play on these motors to allow correct adjustment of the thrust bearings.


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Fluid are you saying on my NEU 2215's in my cat I don't need em'? they are the newer versions... catboi didnt have thrusts on em but he never ran the boat.. I ran it once and have been worried that until I fool around and put them on I don't want to run it again... and i would have to cut the output shaft down some or put on 2 or 3 sets of thrust bearings on each bearing as the coupler doesn't slide down far enough for only one thrust.... hmmmm this is good info Fluid... I appreciate your knowledge and help on this.... and what you are saying makes since.... I ran other NEU's without thrusts for a bit and they never had an issue with endplay or premature bearing wear...

[BakedMopar]

I have an older Neu that doesn't have the endbell pinned. The new ones don't need them because their pinned like fluid states but the older ones weren't.

[Fluid]

What do you think about the castle creations motors?

I don't have one, nor have I inspected one closely so I can't comment. I specified the "real" Neu motors because I know they work without a thrust bearing. I have never used a thrust bearing on a Neu, even the old ones without the pinned endbell, and never had a problem. I suppose a worn old version might pop the endbell off.

...if there is too much space between the coupler and the bell housing, would it be ok to install 2 thrust bearings toghether to fill the gap?

It would be okay, but not really necessary. You can use a spacer made from thick walled tubing, etc. to take up the space. All it has to do is transfer the thrust from the coupler to the bearing.




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[BHChieftain]

It would be okay, but not really necessary. You can use a spacer made from thick walled tubing, etc. to take up the space. All it has to do is transfer the thrust from the coupler to the bearing.

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Nice tip, thanks,
Chief

[properchopper]

What do you think about the castle creations motors? I have a new cc1518 and in order to get the couper to sit snug against a thrust bearing will cause me a lot of rework... which I'm happy to avoid...

I have a neu 1515 and noticed there is hardly any axial play, while there is quite a bit on the cc1518.

One other question-- if there is too much space between the coupler and the bell housing, would it be ok to install 2 thrust bearings toghether to fill the gap?

Chief

Kintec has nice spacers just for this purpose.

[BakedMopar]

Or if your cheap you can drill out a wheel collar. That's what I use on my sv motors.

[m4a1usr]

who here is running these bearings on the motor

I run a thrust bearing in all of my builds. Its just second nature to me. Do all of them need it? Dont know for sure, but its cheap insurance the way I look at it. All one needs to do is leave a gap between the drive dog and the strut or stinger. Then all the force is put on the bearing. My feelings are they are normal for any build but thats just my opinion. One of the first things I do when I get a new motor is trim down the output shaft and fit a coupler and bearing to it. Even if the motor doesnt have a hull to go in yet!

John

[chummer]

Thrust bearings are not a bad idea on the Feigao motors and other with glued endbells. There is enough end play on these motors to allow correct adjustment of the thrust bearings.
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What is the correct adjustment? How do you correctly use a thrust bearing? Do you pull the motor shaft untill there is no more movement in either direction?

[Fluid]

To correctly pre-load a thrust bearing your motor has to have axial (end) play....the shaft slides in and out a little. You want to set the thrust bearing so that there is still a small amount of end play (but less than without the bearing) so that the thrust bearing takes it all under compression but is not in a bind.

If you just set the bearing so there is no play, then you have no idea of the pre-loading, and you may install the thrust bearing compressed too tight. This can increase the internal drag of both the thrust and motor bearings greatly and reducing bearing life. Or the thrust bearing may not be transferring any thrust at all. Since Neu motors usually have no end play, you can't accurately set the pre-load.



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[steveo]

on my cc 1518 say there is 1/16" of play which pushes foward toward the prop i will split the difference and set the thrust bearing to allow alittle play but the prop thrust to be absorbed by the thrust bearing and not the end bell bearing

is this correct