IF you fabricate(compression gauge fitting) a way to put compressed air into the spark plug hole, it will keep the valve closed so you can remove the keepers. Check with Autozone, Pep Boys ect. for a valve spring tool to do it with.
can you change the injector tubes and seals without removing the cylinder head on a 1.7 cdti Vauxhall combi and is it much of a job
Replace them. This can be done without removing the heads. Talk to your mechanic about this.
It is used to replace valve seals on many automotive engines without removing the cylinder head from the block.
You need to change the seals. You can buy a complete set of seals, or just change the seal that leaks. it is pretty simple and can be done with no special tools. But be aware not to get any dirt into the pump.
most auto parts stores sell a kit with everything you need for this task. Including instructions.
The valve seals most likely.
Lots of labor but can be done without removing heads. If doing it yourself, not much cost -- seals plus valve cover gaskets. Shop cost if not doing it yourself -- prohibitive.
if your talking about the oil seals that go around the valve stems, you can do it with some specialized tools. But if your talking about removing the valves which include the stems then your going to have to pull the heads to get them out.
They are in the water because the sealions chased them away.
Sea lions have earlobes, but seals have ears without lobes.
like a boss
The valve seals in the head are bad.