Cylinder Base Nut Wrench, M14-P
When does a tool become...a precision instrument?
You actually know the moment you pick it up.
This wrench is a pattern of the field service tool included in Yak 52 toolboxes. The test of accuracy in reproduction wrench geometry is the cylinder base nut next to the sump, shown here.
But surely adding a half inch drive couldn’t hurt for accurate torque wrenching?
The factory spec for cylinder base nuts is 27.5 ft lbs ( Source: Termikas engine manual) but an informal survey we made of several well-respected Yak mechanics suggests many people are using closer to 45 ft lbs - the value for Lycoming cylinder base nuts. We tested this wrench to failure at beyond double that value.
Will you be able to break yours ?
If that’s what you set out to do, then certainly.
But if you treat this instrument with the same care as the other tools in your toolbox, then most likely it will neither break nor the socket’s 12 points become dull.
Not going to lie, we went down the Rabbit hole with metallurgy and heat treating on this one.
Want us to go into all the blah blah blah about grain structure and Brinell Hardness?
No, of course you don’t
You’ve already got a drawer-full of busted Chinese ones.
The Yak Collection - tools for a lifetime