Valve guide clearance question

[ATAl]

Should a valve move side to side at all when it is lifted out of its seat any amount?

Mine are moving less than 1mm, and all the ones I have taken off seem to move about the same amount.

The valve springs and all that stuff has been removed.

[fivebob]

Should a valve move side to side at all when it is lifted out of its seat any amount?

Mine are moving less than 1mm, and all the ones I have taken off seem to move about the same amount.

The valve springs and all that stuff has been removed.

Shouldn't move that much, but the correct way to measure clearance (if you have the proper tools) is to measure the valve guide diameter and subtract the valve stem thickness, e.g. on a 4A-G it should be
Intake - .0010"-.0024" (.025mm-.061mm), max limit is .0031" (.079 mm)
Exhaust - .0012"-.0026" (.031mm-.066mm), max limit is .0039" (.10 mm)

[ATAl]

Thanks, but I don't have the right tools so I'm just trying to get a rough idea of how much it should move.

[fivebob]

Making some basic assumptions like the valve guide length being approx 1/2 of the valve stem length, then at full extension they should move <0.2mm. but you'll still need something like a dial gauge to measure it. If it's anywhere close to that then the valves/guides probably need replacing, but get them checked by someone who has the right tools to confirm this.

Guesstimates made using the eyecrometer are usually a complete waste of time unless something so far out of spec it's really noticable. The tolereances are very fine and need to be measured with the correct equipment.

[ATAl]

Ok, guess I'll take it down to the mechanic tomorrow

[matt dunn]

Guesstimates made using the eyecrometer are usually a complete waste of time unless something so far out of spec it's really noticable. The tolereances are very fine and need to be measured with the correct equipment.

yeah,

I measured my cams using a degree wheel and vernier calipers and some other bit's, but when i tracked down a dial gauge and did it properly you would not believe how far out my other measurments were.
If you haven't got the right tools for a job like that, your wasting your time.

Matt

[matt dunn]

Guesstimates made using the eyecrometer are usually a complete waste of time unless something so far out of spec it's really noticable. The tolereances are very fine and need to be measured with the correct equipment.

yeah,

I measured my cams using a degree wheel and vernier calipers and some other bit's, but when i tracked down a dial gauge and did it properly you would not believe how far out my other measurments were.
If you haven't got the right tools for a job like that, your wasting your time.

Matt