MY INSTAGRAM: / officialaaronaaron A Quick Tutorial How to video to Diy Lap your Valves by hand with simple tools, hope this helps people who are stuck, if you need advise drop a comment
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!
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 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?
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.
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
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.
