Use of "Jam Nut" on Rocker Arm Tappets

[KVH]

Use of "Jam Nut" on Rocker Arm Tappets

The jam nuts on my rocker arm look too worn or rounded, so I have new ones from Moss.

Is there a top or bottom??

How do these things actually work?

Thanks, all.

 

[TR3driver]

Re: Use of "Jam Nut" on Rocker Arm Tappets

Usually no top or bottom, but look to see if one side is rounded or has a raised round area. The rounded side would go up, the raised side would go down.

Just an ordinary nut, really, except for somewhat thinner. Same principle as double-nutting a stud to install it, the threads in the nut fight against the threads in the rocker arm and lock the adjuster from turning.

 

[DNK]

Re: Use of "Jam Nut" on Rocker Arm Tappets

How a bout a hardware store. I can get it in stainless if you want

 

[TR6BILL]

Re: Use of "Jam Nut" on Rocker Arm Tappets

Stainless is too soft for this application. And the whole area is bathed in oil constantly. Rust is not an issue.

 

[DNK]

Re: Use of "Jam Nut" on Rocker Arm Tappets

I'm just saying I probably could get it in Cadmium too.

Just making a point Bill.
Hardware store. Probably .25

 

[TR6BILL]

Re: Use of "Jam Nut" on Rocker Arm Tappets

Don't ever do that again....

 

[tdskip]

Re: Use of "Jam Nut" on Rocker Arm Tappets

And the whole area is bathed in oil constantly. Rust is not an issue.

Hopefully anyway!

 

[TR3driver]

Re: Use of "Jam Nut" on Rocker Arm Tappets

How a bout a hardware store. I can get it in stainless if you want

Sure. I've used hardware store nuts in a pinch. But they are taller than the original jam nuts, and look funny. Probably add undesirable reciprocating mass to the valve train as well.

 

[DNK]

Re: Use of "Jam Nut" on Rocker Arm Tappets

But they are taller than the original jam nuts, and look funny.

I guess your right. Real important in those see thru valve covers.