replacing valve spring

[dukedusterwrx]

Hey whats up i am wondering if there is any way to replace the valve spring with removing the head from the block? anyone know

[OneQuickV6]

Absolutely! Get the spring compressor tool, and the air fitting to pressurize the cylinder(s). Plug into the compressor with the fitting that goes into the spark plug hole. And then change it. The rear ones can be a pain, but a little patience goes a long way!

[Seppo Kaitainen]

It is realitively easy. Go to Napa or someplace and get a valvespring compressor tool(should be about 30 bux). Also a telescoping magnet is helpful in grabbing the retainer locks.

I have changed mine w/o the handy air fitting. Just need to make sure the cyl is at top dead center.

[OneQuickV6]

Yep, TDC is good too, but for some harder to find than it is to plug in the compressor and fitting [img]smile.gif[/img]

[dukedusterwrx]

thanks guys i really appreciate the feedback

[AZ3.8Camaro]

Yep it is easy, I just did all my valve stem seals on the car. If you use the air fitting, its quite simple.

[Turbo V6 Camaro]

Originally posted by OneQuickV6:
Yep, TDC is good too, but for some harder to find than it is to plug in the compressor and fitting [img]smile.gif[/img]

wouldn't it have to be at top dead center to hold the PSI back (vuale would need to be sealed right ?

[OneQuickV6]

When the car isn't running, the valves are sealed [img]smile.gif[/img] That's the way hydraulic motors work, only at bigger RPM's are the lifters "extended" to give you the lift. At idle when they bleed off, the spring has more pressure and closes the valve. So no, you don't have to be at TDC to pressurize the cylinder.

[Turbo V6 Camaro]

Originally posted by OneQuickV6:
When the car isn't running, the valves are sealed [img]smile.gif[/img] That's the way hydraulic motors work, only at bigger RPM's are the lifters "extended" to give you the lift. At idle when they bleed off, the spring has more pressure and closes the valve. So no, you don't have to be at TDC to pressurize the cylinder.

now im confused there is no way i seen into my exuast port when ithe motor was out of the car, i could see light that we put in the plug hole theres no way that would hold back air

[AZ3.8Camaro]

When the car isn't running the valves aren't sealed.
What I think happens is that the air will push the piston down until it reaches a point so that the valve is almost ready to open, but the chamber is pressurized from the air, and so the valve has enough pressure on it to make the cam just hard enough to turn so that the pressure on the piston is not enough to turn the cam to open the valve. I don't think the piston goes to BDC exactly. This is my guess.

When the car isn't running, the lifters do bleed off, and at idle they do it too. That is to let you run a bigger cam with a smoother idle. They don't bleed off enough to keep the valves from opening with the motor off.

[98Camaro3.8]

The last engine I worked on was a 94 3.1 in an Oldsmobile Cutlass. It had hydraulic lifters, and the valves would open if the cam was in the correct spot. Anywhere on the combustion or power stroke, however, the valves would be sealed. It doesn't have to be exactly at TDC, but just on either the combustion or power stroke. Just turn the motor over by hand until both valves fully close.

[Turbo V6 Camaro]

Originally posted by AZ3.8Camaro:
When the car isn't running the valves aren't sealed.
What I think happens is that the air will push the piston down until it reaches a point so that the valve is almost ready to open, but the chamber is pressurized from the air, and so the valve has enough pressure on it to make the cam just hard enough to turn so that the pressure on the piston is not enough to turn the cam to open the valve. I don't think the piston goes to BDC exactly. This is my guess.

When the car isn't running, the lifters do bleed off, and at idle they do it too. That is to let you run a bigger cam with a smoother idle. They don't bleed off enough to keep the valves from opening with the motor off.

hes using "OER" thers not going to bleed off to much, or at least i hope to hell not [img]graemlins/stickpoke.gif[/img]

[dukedusterwrx]

wow thanks for all the inforamtion guys this will definitly be a handy thread to search on when ssomeone has trouble but anyways gonna try to do the spring friday ive been too damn busy with college LOL but if there is any other information shoot it at me!!

[dukedusterwrx]

I cant get the air fitting to fit very well so i am goiong to do the TDC procedure ARe you absolutlry sure i wont lose my valve in the cylinder please respond quickly! thanks

[dukedusterwrx]

i really dont wanna pull off my head again so if i can put the piston at tdc and the valve will rest on it right?