DW Posted March 22, 2005 Share Posted March 22, 2005 Is there a way to replace the valves and oil seals without taking the cylinder head off? David 1700XF - http://groups.msn.com/WilkesCaterhamPages Link to comment Share on other sites More sharing options...
oilyhands Posted March 22, 2005 Share Posted March 22, 2005 Stem seals, yes... valves.. no Dave Link to comment Share on other sites More sharing options...
V7 SLR Posted March 22, 2005 Share Posted March 22, 2005 Ooh, now you see you've piqued my curiosity... how do you get new stem seals on without taking the head off? How do you clamp the valve enough to get the springs off? I'm seriously intrigued. I can't even imagine a sci-fi solution to that. Link to comment Share on other sites More sharing options...
DW Posted March 22, 2005 Author Share Posted March 22, 2005 Can you compress the springs then without taking the cylinder head off? Link to comment Share on other sites More sharing options...
V7 SLR Posted March 22, 2005 Share Posted March 22, 2005 That's what I just asked. Link to comment Share on other sites More sharing options...
Bare Posted March 22, 2005 Share Posted March 22, 2005 Using an Air compressor and a suitable fitting, pressurising the cylinder allows springs and seals to be replaced. Some have managed similar using a length of flexible (poly?) rope inserted thru the plug hole. Obviously the Valves cannot come out without removing the head :-) Link to comment Share on other sites More sharing options...
oilyhands Posted March 22, 2005 Share Posted March 22, 2005 Both methods suggested by Bare are workable, but the poly rope doesn't rely on the valves sealing 100%. Oily Link to comment Share on other sites More sharing options...
Paul D Jones Posted March 23, 2005 Share Posted March 23, 2005 But by the time you have done a few you will wish you had removed the head Paul. See My Car Here Link to comment Share on other sites More sharing options...
chrisddl Posted March 23, 2005 Share Posted March 23, 2005 The stem seals can be replaced without taking the head off. You will need an special valve spring compressor ( see your local autofactors). The clamp grabes hold of the valve spring and compresses the spring, leaving you to remove the collets. Be aware, it's the piston in it's top position which prevents the related valve from slipping down into the cylinder. Obviously, you do the removal / replacement one valve at a time. ChrisL Link to comment Share on other sites More sharing options...
Big Brother Posted March 23, 2005 Share Posted March 23, 2005 My valve springs were changed using the compressed air method. (thanks to Steve F) It was all pretty straight forward if a little nerve wracking. The colletts are so small and the oilways look do big (especialy when the collet is held over them!) Steve SE7EN-UP! Incorporating the Caterham Links Database Link to comment Share on other sites More sharing options...
DW Posted March 26, 2005 Author Share Posted March 26, 2005 Instead of using string to see if the valves are shut, if the piston is at the top of the cylinder, doe that achieve the same effect? Link to comment Share on other sites More sharing options...
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