Problem removing inner valve springs

Small Block Mopar Engine

  1. Dusten

    Dusten Active Member

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    I will be breaking in a new cam (292\ .501) so I am trying to remove the inner valve spring per recommendation. So I bought the air hose that screws into the spark plug hole, and the proform rocker shaft mounted valve spring compressor for small block mopars. My air compressor pumps the cylinder up to about 80-90 psi and the valve spring compressor tool is easy to use. My problem is when I compress the spring the valve goes down with it and blows highly compressed air out the intake/exhaust port. How much psi do you need to hold the valve stem in place? 90 is the max my air compressor goes up to. I would think 80-90 psi would be enough. Is there something I am missing? Any other way to hold the valve stem in place when I compress the spring down. I really don't want to take the heads off to remove them. 340 with x heads.
     
  2. RustyRatRod

    RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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    You have to unlock the valve locks first. You do this by tapping on the valve spring retainer a few times with a small hammer. The retainer. Not the valve stem. Tapping the stem just locks the valve in harder. Tap the retainer and then try it again. Make sure the piston is at TDC on the cylinder you are on in case the valve falls.
     
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    • 72Dart6pack

      72Dart6pack Harder Better Faster Stronger.

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      Put a rope in the spark plug hole. And bring the piston up slowly. Now the valve won't fall in the hole.
       
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      • brian6pac

        brian6pac Well-Known Member

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        It's hard to keep it at TDC it has to be perfect. Put the piston down and fill the cyl with air 90 PSI is great. Then tap the edge of the retainer till it pops loose, you will hear the difference. Now you can compress the spring. DON'T remove the air or the valve will fall into the cyl.
         
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        • Arron tate

          Arron tate T B L

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          Hello Dusten,
          Just as info use a nylon hammer to tap with so as not to dammage any thing.
          8 oz. Soft Face Hammer-57-594 - The Home Depot
          Happy Mopar :)
          Arron
           
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          • Tooljunkie

            Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

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            I heard using a socket over the spring cap and a rap with a hammer works. I like the rope idea. Thats old school
             
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            • 72Dart6pack

              72Dart6pack Harder Better Faster Stronger.

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              Old school still works like a charm and no compressed air needed either.
               
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              • 1994redram

                1994redram FABO Gold Member FABO Gold Member

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                I've always put rope in the cylinder and spun the crank until the piston stopped. No worries of losing the valve that way and you can hit the retainer as hard as needed without the valve moving.
                 
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                • my5thmopar

                  my5thmopar Life Long MOPAR Owner FABO Gold Member

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                  And....Make sure you put rags in the holes so those little buggers don’t fall in your engine. A magnet helps to contain them. I like using a socket like Tooljunkie mentioned.
                   
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                  • Dusten

                    Dusten Active Member

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                    How long of a rope does it take?
                     
                  • 72Dart6pack

                    72Dart6pack Harder Better Faster Stronger.

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                    Maybe a 12 to 18 inches.
                     
                  • RustyRatRod

                    RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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                    THe rope does work fine, but yall are makin this so difficult. He HAS air. AIr works great as long as he brings the piston up to TDC on the cylinder he's working on. It's not hard at all.
                     
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                    • JBurch

                      JBurch Well-Known Member

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                      Keep a real close eye on the valve keepers when you shock the retainer, they have been known to fly off in directions unknown, use the rope deal. It will take longer to do, but it is a much more positive way to NOT loose the valve.
                       
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                      • brian6pac

                        brian6pac Well-Known Member

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                        Why does it matter top or bottom the rockers are off and there is no f!@#ing around just hook up the air, the piston will go down and there will be the same air pressure.
                         
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                        • Wyrmrider

                          Wyrmrider Well-Known Member

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                          sometime the engine spins when on air
                          then the valves fall
                          then...
                           
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                          • brian6pac

                            brian6pac Well-Known Member

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                          • RustyRatRod

                            RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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                            SO he won't have to pull the head off to get a valve out that's dropped all the way down in the cylinder. If he turns each piston up to TDC as he's working on them, he needs no rope and really no air. BUt since he HAS the air, he may as well use it.
                             
                          • RustyRatRod

                            RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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                            I have never once in my life ever seen shop air in ONE cylinder turn an entire engine.
                             
                          • oldkimmer

                            oldkimmer FABO Gold Member FABO Gold Member

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                            I have had lots of engines turn over with air applied to 1 cylinder when I was doing valve seals. Ofcourse they had lots of miles. Kim
                             
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                            • oldkimmer

                              oldkimmer FABO Gold Member FABO Gold Member

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                              R u trying to remove the inner spring or the Dampner. I use the socket trick. Kim.
                               
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                              • Murray

                                Murray FABO Gold Member FABO Gold Member

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                                Just a side note- when you tap the retainer with the hammer, it should be on one side of it, not on all sides like using a socket. The idea is to 'cock' it slightly to one side to "break" any seal formed by the retainer/keeper. Now they can be removed easily.
                                 
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                                • RustyRatRod

                                  RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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                                  With the plugs still in? I'd have to see that with my own one good eye.
                                   
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                                  • TrailBeast

                                    TrailBeast Slightly Twisted Member

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                                    When I was diagnosing a leaking exhaust valve in a Ford 352 engine I hit it with air and the engine turned.
                                    The rope is soooo much safer, especially for someone not really familiar with doing it.
                                    Couple of feet of 1/4 nylon rope works perfect.
                                    I have done it just using the piston at TDC and no air or rope either one, but it was a little bit more of a pain in the backside because you have to keep the valve up when putting the springs back on.
                                    Just a little pressure to one side on the stem helps, but the rope is fail proof.

                                    If you want ship your eye over and I'll show it.:rofl:
                                     
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                                    • yellow rose

                                      yellow rose Doctor of Thinkology.

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                                      All this work for that little cam?

                                      Screw that. Get the timing set and fuel in the bowls and crack it off.
                                       
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                                      • 4spdragtop

                                        4spdragtop FABO Gold Member FABO Gold Member

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                                        I wonder what the formula would be to equate 90 psi to force? :lol:
                                         
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