after lapping them in you should get a powerful led torch and shine it through the port and see if any light is escaping from the valve...this method is better than pouring brake fluid on the valve for leakage test...light is more penetrating than anything!
I have a question I'm lapping new valves on a used cylinder head how do I know when I have right? And also I made sure to oil my valve stem and not get any griding paste on it but my valve stem still got a bit scuffed up will that affect it in any way?
How long do you gring them for? And how hard do you press? I was told it only needed a few passes but looked like you was really going at it. Got to rebuild a head on trafic 2.5dci
Depends. Many modern compounds break down and you listen for the grinding pitch to change. You’re looking to seal so if it passes then you’re good to go. No real set time to lap
+Frans Dijckmeester you need to always have a clean rag and check the stem every time you apply paste, always keep the stem oiled. The paste will only stay where u apply it
I've cut my valve seats and when I went to lap my calves in I used the rough paste and then the finer paste and it looks great, but when I add mineral spirits and the Chamber will the valve goes when it's all set up with the spring and valve keepers Etc it's still leaks a little bit and I can't seem to get the leaking to stop. Any suggestions
William penrose if you use a seat cutter that has a set angle you will end up with the same angle as the tool. They make 45 degree or 46 degree seat cutters
When you use a drill, rather than lapping- you can end up with oval shaped surface if the vale guide is not perfectly centered. Single direction Rotation is not good.
by sound,and after that checking for leaking.Type this in youtube-"cylinder head 105 valve job basics" and watch the first video,you will get a lot of info about that type of job.
Sims Simms make sure all carbon has been cleaned from the valve face and then dip the suction cup in water before sticking it to the valve. Should definitely help
Lapping is the smallest part of a proper valve job. Wayyy too many incorrect videos leading people to believe a valve job can be done properly for a $5 tube of paste and a cordless drill.. Maybe you're lapping correctly and minding the specifications from the manufacturer but most of these videos ignore contact width spec and lead people to destroy what may be a perfectly good valve job to start with!
You have to have very tight and perfectly straight guide bores to begin with, and before that you should have the new guides pulled in concentric to the existing seat, not hammered in. That's where it all begins, otherwise you're lapping a valve in off-center and it will wear out the guide very quickly.
![Save Money And Lap Your Own Valves! [Measured Results]](http://i.ytimg.com/vi/TPCrR-R7cTY/mqdefault.jpg)
![Save Money And Lap Your Own Valves! [Measured Results]](/img/tr.png)
![BLACK BAG - Official Trailer [HD] - Only in Theaters March 14](http://i.ytimg.com/vi/Du0Xp8WX_7I/mqdefault.jpg)
after lapping them in you should get a powerful led torch and shine it through the port and see if any light is escaping from the valve...this method is better than pouring brake fluid on the valve for leakage test...light is more penetrating than anything!
Or blue it
i have a questions, how long did you take to grinding the valve with hands for one valve?
Brilliant video I’m doing mine today as part of my engine rebuild
Really helpful video mate, thank you
I work in machine shop in kuwait doing 15 head grind per day nice to see your work.
Thank you for this video, this is the best and only way to do it. Thanks again!
I have a question I'm lapping new valves on a used cylinder head how do I know when I have right? And also I made sure to oil my valve stem and not get any griding paste on it but my valve stem still got a bit scuffed up will that affect it in any way?
How long do you gring them for? And how hard do you press? I was told it only needed a few passes but looked like you was really going at it. Got to rebuild a head on trafic 2.5dci
Depends. Many modern compounds break down and you listen for the grinding pitch to change. You’re looking to seal so if it passes then you’re good to go. No real set time to lap
How do you make sure the grinding paste doesn't get in your valve stem hole?
+Frans Dijckmeester you need to always have a clean rag and check the stem every time you apply paste, always keep the stem oiled. The paste will only stay where u apply it
By turning your brain to the ¨ON¨ position. Sorry, I had to. lol
What grit would the fine paste be?
Grease the stems first to keep any grit out of the guides or it will embed itself and wear them out very quickly.
It's the hard work that scares them
Hi. Do you have any videos of changing the valve guides?
No I normally get my machine shop to fit them
@@AaronUnknownPerformance Hi, so how does one know when to change the guides?
Great video 👌🏽
Thanks man!
Great videos
I've cut my valve seats and when I went to lap my calves in I used the rough paste and then the finer paste and it looks great, but when I add mineral spirits and the Chamber will the valve goes when it's all set up with the spring and valve keepers Etc it's still leaks a little bit and I can't seem to get the leaking to stop. Any suggestions
+William penrose did you get seats cut at machine shop? Are the valves pitted at all? Try using petrol rather then spirits. What engine is this
The engine is for a Yamaha waverunner vx110 model (all engines are the same) and I cut the valve seats myself, and the valves are brand new..
I also tried petrol and it still leaks
How can I tell if my valve seat is 45 degrees?
William penrose if you use a seat cutter that has a set angle you will end up with the same angle as the tool. They make 45 degree or 46 degree seat cutters
Is there a reason you didn’t use a drill to speed it up on slow setting.
Great video by the way 👍
When you use a drill, rather than lapping- you can end up with oval shaped surface if the vale guide is not perfectly centered. Single direction Rotation is not good.
Yes because it stuffs up the seat on both
How do you when to stop grinding them
by sound,and after that checking for leaking.Type this in youtube-"cylinder head 105 valve job basics" and watch the first video,you will get a lot of info about that type of job.
Thank you
thanks man
This is a prosperous what is the new?????
My lap tool wont grip the valve
Sims Simms make sure all carbon has been cleaned from the valve face and then dip the suction cup in water before sticking it to the valve. Should definitely help
use super glue, it's the pros choice..
amazon link to the coarse and fine paste please?
Cheers m8
Lapping is the smallest part of a proper valve job. Wayyy too many incorrect videos leading people to believe a valve job can be done properly for a $5 tube of paste and a cordless drill..
Maybe you're lapping correctly and minding the specifications from the manufacturer but most of these videos ignore contact width spec and lead people to destroy what may be a perfectly good valve job to start with!
You have to have very tight and perfectly straight guide bores to begin with, and before that you should have the new guides pulled in concentric to the existing seat, not hammered in. That's where it all begins, otherwise you're lapping a valve in off-center and it will wear out the guide very quickly.