stuck seats

[Sawatch8N]

Working on my 50s 8n engine for overhaul, have a delima. I can't get the valve seats to release so I can pull the pins/clips. Have made a tool to pry and can only access the exhaust ports and have only moved one and even then not enough to pull the clip free. A couple of thoughts, a pin held under the valve head with it in the open position & on the seat top & hammer down on the valve, cut the valve top off to access seat with a punch. Yes they're soaking in penetrating oil and yes it means new valve assemblies when done.

 

[Bob]

Valve GUIDES.

Penetrating oil and a bent punch/prybar are your friends.

 

[Sawatch8N]

Ment GUIDES...

 

[NOXJohn]

Valves can be a real pain to break loose. PB Blaster and time has always done it for me. Time maybe days. Soak, pry and wait. If you try to hard you may break something and make the situation worst.

 

[Hobo,NC]

As a experiment I wanted to see how long it would take to spray/loosen a set with PB,,, took a year...

If in a hurry I go with a automotive valve spring compressor,,, treat the block as if it were a head,,,

 

[mhb@ufe]

You can use a pair of vise grips and pull the clips out without moving the guide down. The clips are soft enough to pull out without damaging the block.

Mark

 

[ZANE]

Remove the manifold. Fabricate a tool from a big long screwdriver by grinding a portion off just behind the flat tip of the screwdriver so that you can insert the tool into the port in the block and pry down on the top of the valve guide. The portion you ground away will allow the guide to go down far enough to easily remove the horse shoe keeper. I use the same big old screwdriver tool to hammer the whole valve assembly with guide spring and valve up and out of the block. Done it a thousand times at least!

Zane

 

[mobydick]

You can use a C-Clamp to remove the keepers then pry out the springs with a large screw driver, now you can raise the valves high enough to get a punch or screw drive from the top to pound down the guides, then you can remove the horseshoes. Now you can pound out the guides.

 

[Sawatch8N]

I got the video and saw how the modified screwdriver is ground/used. Too tight for that. Will try releasing the lower clips and I am taking my time. don't need to crack the block.

 

[ooticamitica]

i doubt you will crack the block with a screwdriver unless you are a real animal with it.