valve seal

[sam JFM]

What's acceptable as leaking from the head when checking for valve fit with solvent after valve replacement?

I am ahuming none what so ever?

 

[sam JFM]

Filled all of the dishes in the head with valves and springs installed, filled with thinners and over the period of about 3-4 hours I think I might have lost a ml or so

Is that acceptable as a good seal?

 

[Mr R.]

Thinners evaporates, you are meant to use paraffin.

 

[sam JFM]

I was under the impression it didn't matter aslong as it was searching?

 

[sam JFM]

Anyone? someone must have some experience with this?

 

[Laine_16v]

Im going to go ahead and say you shouldn't be accepting anything less than 0 leakage! I diesel tested my builds none of them have ever passed a drip when left overnight.

 

[sam JFM]

I feared that might be the case! what a ball ache!

 

[Chip-mk1]

Zero, but you can check by looking in the ports too dont forget, if you are worried its just evaporated not leaked.

a ml in 3-4 hours doesnt sound like its leaking to me.

 

[sam JFM]

You cant really see much in the exhaust ports because of the carbon build up! I will have another look later on but I think im going to have to spend a little more time on it!

 

[Chip-mk1]

If in doubt, just lap them again.

 

[sam JFM]

Some red diesel will be ok to do the test wont it? thinners is bloody expensive!

 

[Chip-mk1]

yes it will be fine

 

[sam JFM]

Bloody valves! Some of the inlet valves are still passing a small amount despite this being the second time I have lapped them!

Each valve head has a continuous dull ring all the way round so I'm not sure what I'm doing wrong? Maybe invest in one of those drill valve lapping tools and give it more beef?

 

[Chip-mk1]

If they arent lapping by hand, is there any damage to the seats?

 

[sam JFM]

Not that I can see, maybe I just need to keep going?

I left the head filled over night and lost perhaps 1-2ml out of two cylinders, so its not all escaping!


Its not pouring out my any means just a little seep - I will have another go later I suppose!