C'est juste charbon, tu peux nettoyer le tête des soupapes.
Le plus important c'est sieze du soupape
Le plus important c'est sieze du soupape
You do
roule
Active Member
Je n'avais pas mis la bonne photo, je voulais parler de la portée des soupapes...je vais devoir en remplacer quelques unes car après mon test d'étanchéité (air compressé et chambre de combustion remplie d'eau), j'ai des petites bulles. J'espère que ce n'est pas le siège qui est abimé...
roule
Active Member
I hadn't put the right photo, I wanted to talk about the seat of the valves...I'm going to have to replace a few of them because after my leak test (compressed air and combustion chamber filled with water), I I have small bubbles. I hope it's not the seat that's damaged...
Datatek
Well-Known Member
Those valves look good to me. Maybe a bit more work with the grinding paste for the seats.
I think what he's saying is with the head removed & upside down with the valves in place is fill the dished area with water & blow compressed air into the respective inlet & exhaust ports whilst looking for bubbles in the water to see how well the valves are sealing.
I agree
Perhaps using a bit of engineer's blue to identify any problems.
roule
Active Member
That's it !
Don't forget the compression forces the valves to shut tighter. Reverse pressure from inlet or exhaust ports will seep past the seats as they aren't designed to seal efficiency in that direction
Put the plugs back in the head and pour a little petrol onto the valve area. Petrol will find it's way out straight away due to it being a thinner fluid. A polish on the seats wouldn't go a miss to refresh them.
You should see a continuous line on the valve and the seat if they are sealing properlyA polish on the seats wouldn't go a miss to refresh them.
roule
Active Member
already did it...
roule
Active Member
I'm a little worried with this cylinder: I have a vertical scratch, not a groove but rather a thickness; a piece of my camshaft that came off and melted?? should I sand it with 800 sandpaper?
