Range EFI valves replacement

J'ai 3 ou 4 clapets d'admission avec une légère corrosion (pas de trou) qui devrait disparaître avec le travail à la pâte. Je me demande si je dois conserver les originaux ou les remplacer par des neufs de rechange ?
thanks

C'est juste charbon, tu peux nettoyer le tête des soupapes.
Le plus important c'est sieze du soupape

They look fine to me

kermit_rr said:

They look fine to me

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You do

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 said:

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...

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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...

Original ones are Chrome-nickel-magnesium-steel made, vs OEM or aftermarket ???

Those valves look great.
If you have water in the combustion chamber then you have a head gasket failure or worse.
It's not caused by bad valves

roule said:

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...

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Those valves look good to me. Maybe a bit more work with the grinding paste for the seats.

kermit_rr said:

Those valves look great.
If you have water in the combustion chamber then you have a head gasket failure or worse.
It's not caused by bad valves

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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.

Datatek said:

Those valves look good to me. Maybe a bit more work with the grinding paste for the seats.

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I agree
Perhaps using a bit of engineer's blue to identify any problems.

Ratae said:

Je pense que ce qu'il dit, c'est qu'avec la tête retirée et à l'envers avec les vannes en place, il suffit de remplir la zone bombée avec de l'eau et de souffler de l'air comprimé dans les ports d'entrée et d'échappement respectifs tout en recherchant des bulles dans l'eau pour voir à quel point les vannes fonctionnent. scellage.

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That's it !

Ratae said:

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.

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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.

Mark Piercy said:

A polish on the seats wouldn't go a miss to refresh them.

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You should see a continuous line on the valve and the seat if they are sealing properly

Thanks for the answers, i shoukd finish the job with very thin grinding.

You can buy lapping paste on ebay etc, usually comes with a sucker stick

Je suis un peu déçu de ce cylindre : j'ai une rayure verticale, pas une rainure mais plutôt une épaisseur ; un morceau de mon arbre à cames qui s'est détaché et a fondu ?? dois-je le poncer avec un papier de verre 800 ?

kermit_rr said:

You can buy lapping paste on ebay etc, usually comes with a sucker stick

Click to expand...

already did it...

roule said:

e suis un peu déçu de ce cylindre : j'ai une rayure verticale, pas une rainure mais plutôt une épaisseur ; un morceau de mon arbre à cames qui s'est détaché et a fondu ?? dois-je le poncer avec un papier de verre 800 ?

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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?