Valve seals...

CSIPSD · Oct 18, 2012

What am I going to gain if anything by replacing the valve seals? Less blow by? Compression? Anything?

Should have done them when I had the motor out, but was in a hurry and so...

SDstroker · Oct 18, 2012

Are you talking the ones under the valve springs? If yours are leaking you will burn less oil I suppose with new ones.

golfer · Oct 18, 2012

we don't run valve seals on our high-ish hp engines...

the only time a (turbocharged) diesel would 'suck' oil through the (worn or non existant) seals would be at idle...if then

valve stem wear is pretty ridiculous on these engines...so removing the seals can increase lubrication of the stem...which is also why even our "stock" engine's get bronze valve guides...

less wear...less valve stem/valve face "rock"..a more square seating for the valves/seats...more longevity.

CSIPSD · Oct 18, 2012

golfer said:
we don't run valve seals on our high-ish hp engines...

the only time a (turbocharged) diesel would 'suck' oil through the (worn or non existant) seals would be at idle...if then

valve stem wear is pretty ridiculous on these engines...so removing the seals can increase lubrication of the stem...which is also why even our "stock" engine's get bronze valve guides...

less wear...less valve stem/valve face "rock"..a more square seating for the valves/seats...more longevity.

So would a motor with around 250k on it and unknown history for the first 180k be a good candidate to just leave it the hell alone?

golfer · Oct 18, 2012

yeah, LOL...

I can't see it doing a damn thing for you, Joe.

CSIPSD · Oct 18, 2012

LOL... Will do.

Derek@Vision Diesel · Oct 18, 2012

if it isnt broken....dont touch it.

04stroker · Oct 18, 2012

Derek@Vision Diesel said:
if it isnt broken....dont touch it.

Add power until it is.

lincolnlocker · Oct 18, 2012

good to know golfer!

KBMKVIII · Oct 19, 2012

im going to attempt these while changing out my valvesprings and pushrods.
any vendors on here that sell them?

OSCS · Oct 19, 2012

KBMKVIII said:
im going to attempt these while changing out my valvesprings and pushrods.
any vendors on here that sell them?

Attempt? It's pretty strait forward. Old one out new one in

OSCS · Oct 19, 2012

golfer said:
we don't run valve seals on our high-ish hp engines...

the only time a (turbocharged) diesel would 'suck' oil through the (worn or non existant) seals would be at idle...if then

valve stem wear is pretty ridiculous on these engines...so removing the seals can increase lubrication of the stem...which is also why even our "stock" engine's get bronze valve guides...

less wear...less valve stem/valve face "rock"..a more square seating for the valves/seats...more longevity.

I'm curious to know why a turbo diesel won't suck down oil at the seals but gasses do?

Hotrodtractor · Oct 19, 2012

OSCS said:
I'm curious to know why a turbo diesel won't suck down oil at the seals but gasses do?

Well.... one has a constant and varying vacuum on the intake runner typically (gas engine) - the other might have a vacuum at idle, but it quickly becomes neutral to positive pressure as the turbo comes on... (turbo diesel) without the vacuum there is nothing in the intake runner to suck the oil down out of the head. Its really more of a difference between naturally aspirated and forced induction - but most gas engines that people are familiar with are naturally aspirated and most modern diesels that we care about a forced induction.

KBMKVIII · Oct 19, 2012

OSCS said:
Attempt? It's pretty strait forward. Old one out new one in

Never done them before.

SDstroker · Oct 19, 2012

KBMKVIII said:
im going to attempt these while changing out my valvesprings and pushrods.
any vendors on here that sell them?

I got mine from riffraff. I figured while I was putting in valve springs and push rods to do them too.

OSCS · Oct 19, 2012

Hotrodtractor said:
Well.... one has a constant and varying vacuum on the intake runner typically (gas engine) - the other might have a vacuum at idle, but it quickly becomes neutral to positive pressure as the turbo comes on... (turbo diesel) without the vacuum there is nothing in the intake runner to suck the oil down out of the head. Its really more of a difference between naturally aspirated and forced induction - but most gas engines that people are familiar with are naturally aspirated and most modern diesels that we care about a forced induction.

Thank you