А что он проверяет я не могу понять. На целостность головки подругому проверяют притертость клапанов просто керосином на самоток проверяют. Мне кажется что он рукапоп
The problem is that you’re checking it the wrong way. Go to a machine shop and have them pull a vacuum test on it or pour some solvent into each ex. and intake port then check for leaks.
For a indian video this method will suffice. I have seen worse but this method seems to work just fine as there is tension from the springs holding the valves against the seats. Seemed to work on the first one
I put solvent in the chamber after seat cutting. With proper sealing it can sit all night and not a drop will leak. I always slam the valve from the rocker side with a fist size hammer about 5 times to mimic the rocker opening and closing the valve This really seats the valve after assembly (it's a must) then I check with solvent. I do seat width by the book. Typical machine shops cut wide (often 2 or 3 times factory width) and rarely correct. Used to be a machinist in my area. Nickname was "45 degree Lee". Wide contact surfaces work but don't seal for long. Start narrow and they get wider with use. Start wide and ...
You would need more air pressure than spring rate. This head probably has over 150lbs of spring pressure. I do this same test all the time with about 25psi of air pressure. After the head is cleaned and the valves are lapped you will not see bubbles any longer.
That’s the wrong way to test it. You’re pushing against the valve spring. Of course it’s going to open slightly. The air has to go somewhere. The best way to test. It is to put water down the runners and see if it leaks out of the valves. If it does, then you have a valve issue. I just recently confirm this on my own Cylinder Head jeep wrangler 3.6. I had low compression and cylinder two so I pulled the head and the exhaust valve looked a little burnt up. When putting water on the compression side, there is no leak, but when I put water inside the runner and let it sit on its side I could see water pouring out of the exhaust valve with no added air pressure
@@oneplumpboi5317 yeah i was hand lapping my valves and was using this method.. if bumped or moved the slightest would bubble but for the most part even the weight of the valve itself with no spring wouldnt bubble.. if i applied the slightest hand pressure it wouldnt.. anyone that seemed iffy ( like one intake i poured water on top and immediately got dripping) I would just re lap and it seems doing this a second time got much smoother. Seems like you can easily have grind compound on the seat or valve to so when water is in the chamber i will spin the valve and it gets nice and smooth. I'm using like 35 year old heads so cant be too careful lol But I think for the most part as long as liquid ( best to use a thin solvent like gas ) can just sit in the chamber especially with the valve un sprung compression is fine... Im pretty certain that valves slapping the seat also laps them in further anyway as they have a tool that does this. So if you get a good seal hand lapping i assume that after running the seal is better
@@DS-mo6md I'm no expert on valve lapping as I have yet to try it on my many engines, but I'm heavily invested in buying some new valve seat cutters to attempt it on my scrap heads before I move on to my high-performance engines. I believe the lifting and slapping motion is not necessarily slapping, but rotating the valve so it's not just lapping on one side per se, since spinning the valve is only a 180+ degree lap usually. There are some pretty good write-up information out there that gives you heads-up on things to watch for, such as the sealing surface only being 1/3 of the 45-degree valve angle and usually as close to the centre.
it doesn’t matter, it presses 5-8 bar in total, and in the combustion chamber at the moment of ignition it’s 60+ bar, and this is on a civil engine atmosphere, I blew into the combustion chamber, bubbles in the intake, poured it from above, then removed the cylinder head blew into the intake like this the same bubbles, while the dynamic compression index was 10-11, but it took a long time to turn the crankshaft.
@@thechum9653 I can not use otherwise))), I am a foreigner. with a different mother tongue. Аnd I conducted a similar experiment, with the cylinder head removed and installed
A Valve leak won't cause an overheating issue. You would need to have a crack between the water jacket and the combustion chamber or a bad head gasket that would cause the coolant to build excessive pressure.
David , I was thinking the same thing . Since compression pushes the valves the opposite direction . It seems it would not take much to push them open by applying pressure as in this clip . I used to pour gas in each chamber and then time it to see not only Wich one is leaking but to do a leak down test of sorts .
I’m pretty sure he’s attempting to test the amount of bubbling to see which one is worse big bubbles mean with a little bit of resistance the seals made bigger/more bubble
If there wasn't any pitting on the valves and valve seats,I would lap the valves. Pour break clean on the upside-down head. If it holds and there is no loss, you're good.
la pression créé par le piston et les cylindres renforcer la fermeture des soupapesle test se fait dans la chambre du gaz pas dans l'admission et l'échappement
it doesn’t matter which way hom blow, it presses 5-8 bar in total, and in the combustion chamber at the moment of ignition it’s 60+ bar, and this is on a civil engine atmosphere, I blew into the combustion chamber, bubbles in the intake, poured it from above, then removed the cylinder head blew into the intake like this the same bubbles, while the dynamic compression index was 10-11, but it took a long time to turn the crankshaft.
Pls tell them about it, they are your brothers, if you don't tell them explain to them why it's improper this way they might think you don't know what you're saying.
I’m not so sure this is a good test; when the engine is working, the pressure over the valve is in the opposite direction, and that helps to seal the combustion chamber. The pressure as your test is showing some kind of supercharging, like a turbo. In this case, you will need stronger valve springs in order to obtain a good seal… saludos!
We're not applying a lot of pressure here. It's not strong enough to push the valve springs. It's just causing some bubbles in the diesel to help us identify the leaking valve seals.
Valve seals only last about 200’000 miles under top conditions and maintenance. Aggressive driving and overheating will reduce the effectiveness and life of the seals also those valves need replacement
You need to do a valve job and make sure the valve seats hold vacuum. Valve job, then correct the valve lash. And you will want to check that your pistons pass the paper test as well
Your not supposed to use tape to seal the ports you just blow high pressure air into it. I work at a machine shop. You will be lapping those valves for hours if not replacing them for no reason
You literally have to use your whole body weight to compress those valve springs for locking them. We didn't apply that much of a high pressure here to blow it open.
I would say probably bad valve seats. The seats probably aren’t sealing. Also, I would look in the ports with an inspection camera to see if there are any cracks. The other thing is the valve guides maybe worn.
You are checking in the wrong direction. there is never pressure going in that direction. I'd fill the ports with diesel fuel and look for leaks. If they barely sweet I'd just tap on the valve in case there was a small peice of carbon stuck under the seat.
You fill the port side with diesel which comes out of the valves if there's a leak right? What's wrong if we blow air through the port side? There is no pressure built up on top of the valves so no chance of them blowing open. It will indicate the leak as well.
You pour liquid through the port side which comes out through the valves if there's a leak. What's wrong if we blow air through the port side? We're not building up any pressure on top of the valves.
Спасибо вам за вот такой способ проверки, я цука пол дня притирал и дул в клапана на воде,они один хуй пузырьки пускали. Когда заябался,по старинке пролил бензином и все держали на 💯%. Так что продолжаю пользоваться старым методом.
There's a lot more pressure than this in the intake manifold when the engine is running. So is the fresh charge always seeping into the combustion chamber? How would that affect the 4 stroke cycle?
@STAR BODY WORKS there is never "alot more pressure" than the compressed air you are using in an intake manifold while the engine is running... in most gasoline engines there is a vaccum in the intake unless you have a turbo or procharged system and then you will have a positive pressure in the intake but you will never have an instance where your intake has 100psi in it while your engine is running under normal conditions lol
@@starbodyworksindia yeah I know but normal when the piston goes up it pushes the valve even more than the spring it's doing and creates a better seal if the leak goes away after you press the valve with your finger than the valve is ok. But the springs is faulty,hope you get the point
Давление в цилиндре давит на клапан с другой стороны ( в сторону закрытия клапана) . А то что представлено на видео полная чушь. Большим давлением воздуха пружину поднимет по любому!!!
![เจ้าผู้เดียว - ดิด คิตตี้ [OFFICIAL MV]](http://i.ytimg.com/vi/q0NLCYKBOTo/mqdefault.jpg)
The wrong way round, if you do a vacuum test it's acceptable.
the wrong way around, if you do a vacuum test it's unacceptable.
If you vacuüm it it's clean
Just take it to a machinist braaahh
Yup
Agreed 🍻 compressing air in reverse could lift the valves even for a little bit but the springs would say no .. so it might be a new concept 🤷🏻♂️
Компрессия давит с другой стороны 😂
А что он проверяет я не могу понять. На целостность головки подругому проверяют притертость клапанов просто керосином на самоток проверяют. Мне кажется что он рукапоп
@@user-th5kg9vr6c клиентов он так разводит на баблодосы
@@user-th5kg9vr6c 😅
The problem is that you’re checking it the wrong way. Go to a machine shop and have them pull a vacuum test on it or pour some solvent into each ex. and intake port then check for leaks.
For a indian video this method will suffice. I have seen worse but this method seems to work just fine as there is tension from the springs holding the valves against the seats. Seemed to work on the first one
I put solvent in the chamber after seat cutting. With proper sealing it can sit all night and not a drop will leak. I always slam the valve from the rocker side with a fist size hammer about 5 times to mimic the rocker opening and closing the valve This really seats the valve after assembly (it's a must) then I check with solvent. I do seat width by the book. Typical machine shops cut wide (often 2 or 3 times factory width) and rarely correct. Used to be a machinist in my area. Nickname was "45 degree Lee".
Wide contact surfaces work but don't seal for long. Start narrow and they get wider with use. Start wide and ...
th-cam.com/users/shortsvsj0SecE2yY?feature=share
Я думаю если на ночь оставить растворитель он выветрится и после будешь чесать голову с мыслью "клапана не держат"
@@stasmihh1166тупые пиндосы😂
Считаю тест абсолютно неправильным так как давление воздуха давит
на клапан и приподнимает его поэтому при таком тесте любой клапан будет пропускать.
You would need more air pressure than spring rate. This head probably has over 150lbs of spring pressure. I do this same test all the time with about 25psi of air pressure. After the head is cleaned and the valves are lapped you will not see bubbles any longer.
Ну да
Согласен .
No tiene traducción al español
А ещё не учитывается нагрев при работе ДВС.
That’s the wrong way to test it. You’re pushing against the valve spring. Of course it’s going to open slightly. The air has to go somewhere. The best way to test. It is to put water down the runners and see if it leaks out of the valves. If it does, then you have a valve issue. I just recently confirm this on my own Cylinder Head jeep wrangler 3.6. I had low compression and cylinder two so I pulled the head and the exhaust valve looked a little burnt up. When putting water on the compression side, there is no leak, but when I put water inside the runner and let it sit on its side I could see water pouring out of the exhaust valve with no added air pressure
Valve spring seated pressure is greater than the air hose. I hate this logic with a passion. It's fine.
@@oneplumpboi5317 yeah i was hand lapping my valves and was using this method.. if bumped or moved the slightest would bubble but for the most part even the weight of the valve itself with no spring wouldnt bubble.. if i applied the slightest hand pressure it wouldnt.. anyone that seemed iffy ( like one intake i poured water on top and immediately got dripping) I would just re lap and it seems doing this a second time got much smoother. Seems like you can easily have grind compound on the seat or valve to so when water is in the chamber i will spin the valve and it gets nice and smooth. I'm using like 35 year old heads so cant be too careful lol But I think for the most part as long as liquid ( best to use a thin solvent like gas ) can just sit in the chamber especially with the valve un sprung compression is fine... Im pretty certain that valves slapping the seat also laps them in further anyway as they have a tool that does this. So if you get a good seal hand lapping i assume that after running the seal is better
@@DS-mo6md I'm no expert on valve lapping as I have yet to try it on my many engines, but I'm heavily invested in buying some new valve seat cutters to attempt it on my scrap heads before I move on to my high-performance engines.
I believe the lifting and slapping motion is not necessarily slapping, but rotating the valve so it's not just lapping on one side per se, since spinning the valve is only a 180+ degree lap usually.
There are some pretty good write-up information out there that gives you heads-up on things to watch for, such as the sealing surface only being 1/3 of the 45-degree valve angle and usually as close to the centre.
Be careful when putting pressure in the system it can make the valves to open
That's exactly what's happening. These guys don't know what they're doing.
The air pressure would have to overcome the valve seat pressure, which is unlikely in many engines.
No. Pressure is on wrong way .
Exactly. Vacuum goes in that side.
it doesn’t matter, it presses 5-8 bar in total, and in the combustion chamber at the moment of ignition it’s 60+ bar, and this is on a civil engine atmosphere, I blew into the combustion chamber, bubbles in the intake, poured it from above, then removed the cylinder head blew into the intake like this the same bubbles, while the dynamic compression index was 10-11, but it took a long time to turn the crankshaft.
@@user-ks9kv4en5r use smart words and maybe people will think your right
@@thechum9653 I can not use otherwise))), I am a foreigner. with a different mother tongue.
Аnd I conducted a similar experiment, with the cylinder head removed and installed
Yep, this is TH-cam mechanics .
A Valve leak won't cause an overheating issue. You would need to have a crack between the water jacket and the combustion chamber or a bad head gasket that would cause the coolant to build excessive pressure.
Would an overheating cause a valve leak issue?
I think they were trying to indicate that overheating resulted in warpage or deformation that caused the leak
@@manelmoyano7080 over heating causes most issues, if it gets hot don't drive it
under normal working conditions the pressure is on the other side so this is probably just sealing "ok"
I agree.
This would cause oil seeping into the combustion chamber
Need to lap in the valves.
Head polish + valve grinding +change valve seals
No!! that needs new springs and retainers!
;n
Nn
The valves aren’t sealing all the way around, either due to carbon buildup or the valves being burned.
Vaccum test is right,big air pressure will little open even a good valves..
David , I was thinking the same thing .
Since compression pushes the valves the opposite direction .
It seems it would not take much to push them open by applying pressure as in this clip .
I used to pour gas in each chamber and then time it to see not only Wich one is leaking but to do a leak down test of sorts .
Ходит слух,что он по сей день притирает клапана....
I’m pretty sure he’s attempting to test the amount of bubbling to see which one is worse big bubbles mean with a little bit of resistance the seals made bigger/more bubble
But the test needs to have consistent air pressure/distance and I don’t know if that happened
I wonder how many heads would leak like that if you tested them excellent way of checking thanks for sharing
Most would because what they are doing is totally useless ! Vacuum test is so much better
If there wasn't any pitting on the valves and valve seats,I would lap the valves. Pour break clean on the upside-down head. If it holds and there is no loss, you're good.
Your air pressure will open the valave boys.
если токое давление воздуха может открыть коапана значит там пружины из фальги
Then they got some weak ass springs ,son.
Lol
Grind sebulan nonstop xkan hilang buih tu kalau tembak angin😂
betull hahahaha
Indonesia I'm fan
@@RohanSanjith he’s not Indonesian
@@aqimjulayhi8798 then
la pression créé par le piston et les cylindres renforcer la fermeture des soupapesle test se fait dans la chambre du gaz pas dans l'admission et l'échappement
Je suis d'accord 👍
it doesn’t matter which way hom blow, it presses 5-8 bar in total, and in the combustion chamber at the moment of ignition it’s 60+ bar, and this is on a civil engine atmosphere, I blew into the combustion chamber, bubbles in the intake, poured it from above, then removed the cylinder head blew into the intake like this the same bubbles, while the dynamic compression index was 10-11, but it took a long time to turn the crankshaft.
Correctly
I've lapped a few valves in my younger years, 😊
오우 귀한 자료네요
밸브에도 스프링이 들어가는거 처음 알았어요
What did u expect if u put a pressure there?
So true because inside there there's spring
Pls tell them about it, they are your brothers, if you don't tell them explain to them why it's improper this way they might think you don't know what you're saying.
The closing of the valve is heard, the springs and the closing is very weak! You need new springs and seal the valves well!
that is not how these valves work. they should be airtight without springs.
Valve need to be knurled so they seat properly and don't hang up in guide
True
Felicitaciones muchachos inyecte más aire así vence el resorte y bota más burbujas. Así siempre por más acentando que estén las válvulas botara aire.
You should be holding the gun away from the port with low pressure in tested fresh valves and seat this way and they will do the same
I’m not so sure this is a good test; when the engine is working, the pressure over the valve is in the opposite direction, and that helps to seal the combustion chamber. The pressure as your test is showing some kind of supercharging, like a turbo. In this case, you will need stronger valve springs in order to obtain a good seal… saludos!
We're not applying a lot of pressure here. It's not strong enough to push the valve springs. It's just causing some bubbles in the diesel to help us identify the leaking valve seals.
Bro this is a real test practice
It's professionally used by many big companies
Nope, the valves are under extreme tension. And the little air they’re applying isn’t nearly enough to open up the valves.
Draw vacuum, or pour gas in the port and see if it leaks into combustion chamber. If so do a valve job
This is not the best method because the air will open the valve automatically
The pressure isn't enough to open the valve here.
@@starbodyworksindia ah okay but you gotta explain it to the others don't get them wrong
Unless those valve springs are made out of aluminum foil it’d take a lot more air to open them
Right bro
@@starbodyworksindia ur right because, the valves have strong spring tension, foam occure its normal even the valve is close
very useful knowledge. Thank You
1 solo cilindro safa ,el resto ay que esmerilar o cambiar asientos de válvulas
Si
It's a Bent valve,grand the cylinder and change the valves💪👍
bentuk design valve tu direka menahan compress dalam silinder. bukan di luar silinder
No tiene traducción.
You are making them leak by pressurizing the wrong side..you are essentially pneumatically opening the valves
They’re not locked. The other ones are just not seated.
Who did the last timing belt??
U would me some bubbles with that amount of pressure too 😂
New valve s.. there All bad.
Valve seals only last about 200’000 miles under top conditions and maintenance.
Aggressive driving and overheating will reduce the effectiveness and life of the seals also those valves need replacement
Самое лучшее, проверка керосином, налил в камеру сгорания, если 15--20 минут держит, --отлично!!!
You need to do a valve job and make sure the valve seats hold vacuum. Valve job, then correct the valve lash. And you will want to check that your pistons pass the paper test as well
Your not supposed to use tape to seal the ports you just blow high pressure air into it. I work at a machine shop. You will be lapping those valves for hours if not replacing them for no reason
You literally have to use your whole body weight to compress those valve springs for locking them. We didn't apply that much of a high pressure here to blow it open.
I would say probably bad valve seats. The seats probably aren’t sealing. Also, I would look in the ports with an inspection camera to see if there are any cracks. The other thing is the valve guides maybe worn.
You are checking in the wrong direction. there is never pressure going in that direction. I'd fill the ports with diesel fuel and look for leaks. If they barely sweet I'd just tap on the valve in case there was a small peice of carbon stuck under the seat.
You fill the port side with diesel which comes out of the valves if there's a leak right? What's wrong if we blow air through the port side? There is no pressure built up on top of the valves so no chance of them blowing open. It will indicate the leak as well.
Backwards test. That pressure is trying to open the valves. Why do this? Do a vacuum on the spark plug hole to see if it leaks down while on block.
тупая проверка .сильное давление может приподнимать клапан...просто демонстрация неразвитого ума.
La presion del aire normal que abre las valvulas ,incluso te demuestra que esta bien
la presion inversa vence el resorte,la presion que ejerce el cilindro sobre las valvulas ayuda a cellar.
Пружину отжимает. Это клиентам так показывать.
Jeszcze takiego testu nie widziałem 🤔
I hate people who try to rebuild an engine just swap it bro
Some are bent :( time to lap in some new valves and away ya go
A leaky valve or two. That one passes for sure
Agreed the compressed air opens the valves.
That's not how you check for leaking valves
Muito prático, vazamento está nas válvulas de escape?
Нужно лить керосин в каналы, и если клапан потеет, значит пропускает, а дуют от небольшого ума..
Тоже так подумал ведь с той стороны откуда дуют поршень сжатия не дает )))
Как долго можно ездить с подобной неисправностью ?
@@2to4n вечность, а может и прогореть клапан быстро, как повезёт
@@HuiloPu благодарю
@@2to4n он может и сотни км проехать, но большой расход будет, и слабее тяга.
Ни когда бы не поехал к этому мотористу
Just some carbon build up on the valves. People who saying it’s the wrong way never built a motor by hand without a machine shop
А ничё что ты давлением открываешь клапана🤣
Ase 30 años mi hermano en gloria está me lo enseñó así las revisaba el está chingón así no ay gerre saludos mi estimado bendiciones 🙏
Time to clean up those valves and seats!
No you need an entire new head
Who's to say the compressed air isn't just blowing the valve open a little bit??? Dude can't figure out why he keeps paying for so much machining lol
Valves need push in to seal not out
Did the same with a used z20let head befor relaping valves
vxr engine? vauxhall?
After watching this I think the engine needs a hone job and a new set of rings. 😂😂😂
It's fine.... pressure will press it down and seal it lol I think😅
I guess they really know what they are doing…..
😂😂 good thing the bang doesn't happen out there...😂😂
You pour liquid through the port side which comes out through the valves if there's a leak. What's wrong if we blow air through the port side? We're not building up any pressure on top of the valves.
Amazing
Слишком большое давление, при таком все клапана не будут держать, надо около 0,4 Bar
вакумировать нужно
👍
When the valves don't seat seal .
Wrong method
Works for us. 👍🏻
Guys he is looking for boost leaks.😂
Спасибо вам за вот такой способ проверки, я цука пол дня притирал и дул в клапана на воде,они один хуй пузырьки пускали. Когда заябался,по старинке пролил бензином и все держали на 💯%. Так что продолжаю пользоваться старым методом.
Керосин лучше
They arent meant to hold pressure on that side of them cheif... thats why all machine shops do vaccum testing to ensure proper valve seating...
There's a lot more pressure than this in the intake manifold when the engine is running. So is the fresh charge always seeping into the combustion chamber? How would that affect the 4 stroke cycle?
@STAR BODY WORKS there is never "alot more pressure" than the compressed air you are using in an intake manifold while the engine is running... in most gasoline engines there is a vaccum in the intake unless you have a turbo or procharged system and then you will have a positive pressure in the intake but you will never have an instance where your intake has 100psi in it while your engine is running under normal conditions lol
You need to grine all the valves
Grind*
@@riccicrozzie8204 ya,I supposed to type that word
so does it leak or not? ? no conclusion of the test
It's leaking hence the bubbles. If it were sealed, air wouldn't pass through it.
@@starbodyworksindia what can be done to seal all the leaks?
The process called Valve lapping.
You blind or sum 🤣
No it works absolutely splended infact you should become my mechanic
The other guy filled his with flammable liquids and vapors. I said he was doing it wrong. He still lit it on fire.
You are doing it the correct way.
At least one valve was good
Тупарезы. Проверяется керосином. А воздухом клапан и приподняться может.
Zabrdast idea ha valve check krny ka ❤
Wal lik neda bro
You’re doing it wrong..
Так разводят в автосервисах. Гидрокомпенсаторы работают от масла!
🧐🧐🧐 I’d call this weak springs more then anything 🤷🏾♂️
Full video link
영상 잘봤습니다
구독과좋아요
누르고 갑니다.
Good
Air pressure is lifting the valve buddy!
Maybe a better test would be to press on valve with you finger as much as you can and than see if it is still leaking
We didn't remove the springs. 👍🏻
@@starbodyworksindia yeah I know but normal when the piston goes up it pushes the valve even more than the spring it's doing and creates a better seal if the leak goes away after you press the valve with your finger than the valve is ok. But the springs is faulty,hope you get the point
Yeah I see your point.
المشكلة هنا
انه لا يوجد احكام للفالف وعلى هذا الأساس المحرك سيكون غير صافي وفيه صرفية بنزين زائدة
Wrong way lol. The taper of the valve seat is designed for cylinder pressure...
So why is it okay when people pour penetrating liquid from the port side?
@@starbodyworksindia its not
test them with a vacuum!!!not with pressure,...you can take them out 1by one and check the valve seats and the valve surface,,,,,
You either need to do a vavle job or you have cracks which means get a new head
Pointless, they are designed to seal the other way.
A leakage is a leakage. Also, the springs won't lift with just air pressure.
Давление в цилиндре давит на клапан с другой стороны ( в сторону закрытия клапана) . А то что представлено на видео полная чушь. Большим давлением воздуха пружину поднимет по любому!!!
Valve guide seals maybe
That how you know if good or not!
No it ain’t lol