Valve compressor

[NickandNeil]

Does anyone have one of these that I can borrow or buy? It is the sort of tool I would only use once, so borrowing one would be great.  Ilive in Plymouth.  See picture.

[phaeton]

Never seen one like that before, how do you stop the valve moving down when you compress the spring?

[NickandNeil]

This tool allows you to change the valve seals without removing the head.

You can buy an airline adaptor to fit into the plughole and pressurise the chamber and the valves will stay up.  The other way is to remove the sparking plug and with the stroke at its lowest point insert 'rope.'or thick twine.  When you have got as much in as possible turn the crankshaft by hand until it sqashes the rope up against the valves, and hopefully it will stop the valves falling in.

The benefits are that you do not have to change head gaskets etc, also it is much quciker.