Engine K Member to motor mount nuts

limp · Aug 20, 2022

Ok, the two large nuts that hold the motor mount to the K member, anyone use a large washer under the nut??

My manual shows a washer, but when I tried one today I did not get enough thread engagement for the lock nut to work very well.... Just a couple of threads out the top of the nut... I can see where a large grade 8 washer would help distibute the load, but I don't see it happening.....

Mstng93SSP · Aug 20, 2022

No, I have never used a washer. I have installed numerous engines and when removing original engines I have never seen a washer from the factory.

96pushrod · Aug 20, 2022

A washer really wouldn’t hurt, but if thread engagement isn’t there then I wouldn’t bother.

With the nylock that sucker isn’t going to come loose, so I wouldn’t worry about a washer.

limp · Aug 21, 2022

96pushrod said:
A washer really wouldn’t hurt, but if thread engagement isn’t there then I wouldn’t bother.

With the nylock that sucker isn’t going to come loose, so I wouldn’t worry about a washer.

My concern was not coming loose, I just thought that slot in the K Member is pretty good sized, the motor mount stud comes through, and a nice fat washer would spread the clamping force out some.....
AS said, not enough thread engagement......

96pushrod · Aug 21, 2022

limp said:
My concern was not coming loose, I just thought that slot in the K Member is pretty good sized, the motor mount stud comes through, and a nice fat washer would spread the clamping force out some.....
AS said, not enough thread engagement......

Then use a flat washer or hit an ace hardware and pick up a flanged nut.

limp · Aug 21, 2022

96pushrod said:
Then use a flat washer or hit an ace hardware and pick up a flanged nut.

The nut I purchased in the LMR kit is a flanged nut....
Use a flat washer?? I thought that is what I started this post about???

96pushrod · Aug 21, 2022

limp said:
The nut I purchased in the LMR kit is a flanged nut....
Use a flat washer?? I thought that is what I started this post about???

This really isn’t complicated. If it’s a flanged nut don’t worry about a washer.

limp · Aug 21, 2022

96pushrod said:
This really isn’t complicated. If it’s a flanged nut don’t worry about a washer.

hey, I am trying to out think the overpaid engineers that spent millions on this design......LOL

Mustang5L5 · Aug 21, 2022

Edit: oops

limp · Aug 21, 2022

Mustang5L5 said:
I bought new hardware. I used new bolts and flanged nuts with a washer on each end…

Only pic I could find
View attachment 700721

You are showing the K member bolts to frame, I was asking about the engine mounts to K member....

Mustang5L5 · Aug 22, 2022

limp said:
You are showing the K member bolts to frame, I was asking about the engine mounts to K member....

Sorry. Too many beers out on the lake

limp · Aug 22, 2022

Mustang5L5 said:
Sorry. Too many beers out on the lake

You are forgiven then.... LOL

Wayne Waldrep · Aug 27, 2022

You said "just a couple threads out the top of the nut"....If the bolt threads reach the top of the nut then it's reached it's max holding. If I understand that comment correctly. Either way, a flanged nut is the only way I've ever seen too.

limp · Aug 27, 2022

Wayne Waldrep said:
You said "just a couple threads out the top of the nut"....If the bolt threads reach the top of the nut then it's reached it's max holding. If I understand that comment correctly. Either way, a flanged nut is the only way I've ever seen too.

Always seems to me that the first couple of threads are not full size so they don't count..... Not always, but these studs sure seem to be that way..... Flanged nuts torqued to 60 ft lbs so were good to go there......
Thanks for the responses...

Wayne Waldrep · Aug 27, 2022

limp said:
Always seems to me that the first couple of threads are not full size so they don't count..... Not always, but these studs sure seem to be that way..... Flanged nuts torqued to 60 ft lbs so were good to go there......
Thanks for the responses...

So did you mean only the first 2 threads engaged? That's different. For example, on a 1" diameter bolt, once the bolt is in 1" it's reached it's max strength from thread engagement. More is just more. So if the motor mount stud (can't remember diameter) makes it's thru the nut even flush to the other side you are good. It doesn't have to protrude at all.

jrichker · Aug 27, 2022

limp said:
Ok, the two large nuts that hold the motor mount to the K member, anyone use a large washer under the nut??

My manual shows a washer, but when I tried one today I did not get enough thread engagement for the lock nut to work very well.... Just a couple of threads out the top of the nut... I can see where a large grade 8 washer would help distribute the load, but I don't see it happening.....

All you need is 2 full threads showing past the end of the nut.

The threads on the motor mount stud are an interference fit with the nuts that come with the car. I guess that keeps them from coming loose. I could not get then to tighten down so that nut firmly contacted the K member, even with the big air impact wrench running on 160 PSI. I had to use one thick washer on each side to get the nut to tighten down completely. Even then a pipe cheater bar on the ratchet was needed to tighten or loosen the nuts.

The motor mounts that I purchased were not marked left or right, and although they look similar, they are different. Be very careful to replace one mount at a time and compare the new mount against the original one to be sure that they are the same.

limp · Aug 28, 2022

My experience with any type of locking nut is you need to have a few threads showing for it to work...... This was NOT happening when I used a washer.....

Engine K Member to motor mount nuts

limp

wrap a little cheese around it and its a done

Mstng93SSP

You have a nice rear end there Dave.

96pushrod

I think they're a little easier to get off

limp

wrap a little cheese around it and its a done

96pushrod

I think they're a little easier to get off

limp

wrap a little cheese around it and its a done

96pushrod

I think they're a little easier to get off

limp

wrap a little cheese around it and its a done

Mustang5L5

That is…until I whipped out my Bissell

limp

wrap a little cheese around it and its a done

Mustang5L5

That is…until I whipped out my Bissell

limp

wrap a little cheese around it and its a done

Wayne Waldrep

Before I post a pic, do you have one of yours?

limp

wrap a little cheese around it and its a done

Wayne Waldrep

Before I post a pic, do you have one of yours?

jrichker

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limp

wrap a little cheese around it and its a done

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Engine K Member to motor mount nuts

wrap a little cheese around it and its a done

You have a nice rear end there Dave.

I think they're a little easier to get off

wrap a little cheese around it and its a done

I think they're a little easier to get off

wrap a little cheese around it and its a done

I think they're a little easier to get off

wrap a little cheese around it and its a done

That is…until I whipped out my Bissell

wrap a little cheese around it and its a done

That is…until I whipped out my Bissell

wrap a little cheese around it and its a done

Before I post a pic, do you have one of yours?

wrap a little cheese around it and its a done

Before I post a pic, do you have one of yours?

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wrap a little cheese around it and its a done

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