I will be replacing valve springs soon on my 98.5 24v and was wondering if the is a way of doing it without head removal? I know you can pressurize the cylinder but does it need to be regulated or could I just put that cylinder in tdc?

 

There is a tool that can compress all the valve springs at the same time so you can replace them at the same time.
You can put in a price request in the vender section here for one. Or talk to a shop and see if they can loan you one.

 

I already have one. I just need to know how to keep the valves from falling in

 

If you put it at tdc and the pressurize the cylinder the air will push the piston down. Just pressurize it and let it rotate to the bottom of the stroke. I would guess there is a tool for airing up the cylinder or you could make one out of an old injector I suppose.

 

If I just put it at tdc and dont pressurize it would it be dangerous using the piston to rest the valves on?