Valve stem seals, without removing the cylinder head

[bccap]

Just found this quote on another forum.

It is a procedure done on motorcycles with overhead valves all the time. Compressed air at even 25 psi will exert a pressure of almost 50 lbs on the valve--plenty to hold the valve in place while you compress the springs and remove the keepers. It is a good way to check the condition of the rings and valve seats as well. Another method is to stuff a small rope into the plug hole and then turn the piston up against the valve to hold it in place. Compressing the springs puts very little down pressure on the valve itself. Have done it many times.
The OP asked for the least expensive approach, and what I told him was about it.

[bccap]

The oldtimer, who owns my local Suzuki shop was telling me about doing it with compressed air. He's in Hawaii right now, but I'll try to get the details when he gets back.

[Nessism]

Sorry, but don't understand.

Your first post says the head is still on the engine, but the second says the head is off. Which is it?

It's easy to remove the valves with the head off the engine, not so easy the other way around.

If you figure out how to remove and replace the seals with the head on the engine please take a bunch of photos and share.

why would'nt the classic ring type work? its still in the bucket bores with the head off.

see attached pic (not mine) imagine the theaded end cut off and bolted to some sort of fabricated mount on the head. (thinking the cam bearing bolt holes)


Not saying its easy, but it would save heaps, over a tear down,gaskets cost alone would be worth it.

[john82q]

Does anyone have a strong opinon, or reason as to why I cant change the stem seals with out removing the head?

Say I use either rope or compressed air to hold the valve up, and make a custom spring compressor.


any thoughts?