Lock vs. Castle nuts

[Peter J]

Before I put my block back together, I'd like to go with a lock nut setup rather and the castle nut cotter pin arrangement for both mains and rods. Lots of locknut designs out there (Marsedn, top lock etc.). Has anyone gone this route? Would seem that the torque specs. would be a lot more accurate.
Any thoughts or recommendations appreciated.
Pete

[Brian T]

Hello Peter,
There was a discusion regarding using lock nuts in Feb this year, seems any are OK except for Nylock in high temp use.

https://www.fordbarn.com/forum/showth...ight=lock+nuts

[Peter J]

Thanks Brian,
I checked out the discussion and I was pretty much answered my questions. I'll give NAPA a try.
Pete

[CarlG]

Wouldn't using locknuts skew the torque values?

[dave in australia]

Originally Posted by CarlG

Wouldn't using locknuts skew the torque values?

You calculate the running torque of the nut by using your torque wrench at a low setting and slowly increase the setting until the nut starts to turn on the thread. Then you add this to the required torque for the total torque required. This ensures you get the required clamping force from the nut.

[Marco Tahtaras]

Sponsored Links (Register now to hide all advertisements)

Originally Posted by CarlG

Wouldn't using locknuts skew the torque values?

Since torque values are modern day estimates with unknown factors I think it's a moot point. For rods for example, I've seen "specs" writtem anywhere from 30 to 55 over the years by different authors. Which one will you choose? What if you end up with something closer to a different author than the one you intended? Is your engine going to fail?