Valve spring (2 Viewers)

[Mark W]

I’m not understanding about how wear will create tighter clearance. Wear on the shims sure. But wear everywhere else will cause a looser clearance which In turn causes noise. Tighter clearance is generally caused by a bad rebuild

In this case, the valve face and valve seat will be the highest wear points. This will allow the valve to sit deeper in the head as it wears (closer to the top of the head than the bottom) to a very very small degree. this will reduce clearance between the cam lobes and the valve shims/followers. Not much not much at all. But by a very small amount over time.

Mark...

 

[manofthewoods]

In this case, the valve face and valve seat will be the highest wear points. This will allow the valve to sit deeper in the head as it wears (closer to the top of the head than the bottom) to a very very small degree. this will reduce clearance between the cam lobes and the valve shims/followers. Not much not much at all. But by a very small amount over time.

Mark...

Exactly!

Shims are super hard = unlikely wear
Head is aluminum = more likely wear, albeit minimal (normally)

 

[Mark W]

Exactly!

Shims are super hard = unlikely wear
Head is aluminum = more likely wear, albeit minimal (normally)

The valves do not seat on the aluminum of the head. That would last a few weeks most likely. The valves seat on... valve seats. Hardened steel.
Still the primary wear point.

Mark...

 

[manofthewoods]

The valves do not seat on the aluminum of the head. That would last a few weeks most likely. The valves seat on... valve seats. Hardened steel.
Still the primary wear point.

Mark...

Good catch.
I shall wait behind the MUD woodshed for my obligatory beating

 

[Mark W]

Good catch.
I shall wait behind the MUD woodshed for my obligatory beating

OMG! A brain fart on Mud! I am soooo glad I have never had that happen. Nope, never. Not at all. never never never.

Mark...

 

[DodgeH8TER]

In this case, the valve face and valve seat will be the highest wear points. This will allow the valve to sit deeper in the head as it wears (closer to the top of the head than the bottom) to a very very small degree. this will reduce clearance between the cam lobes and the valve shims/followers. Not much not much at all. But by a very small amount over time.

Mark...

That makes sense. I’ll take this stuff into consideration