Hi. This video shows - step by step - making and replacement of valve seat. Material for the new valve seat - 42CrMo4+QT . . . for more interesting videos click ,, HERE " / @paulxchannel
Świetny pokaz naprawy głowicy. Szczegółowo, nie ukrywając szczegółów. Ogromnie przydatny. Przekazano wiedzę, której trudno znaleźć w książkach. Ten film to rodzynek !!! Nie spotkałem takich nigdy. Podziwiam, pozdrawiam i dziękuję.
The precision tool for measuring valve seat counter bore diameters is excellent. Never realized such a tool existed and figured you'd just use verniers.
Nice video, thank you. Your tools make me envious. I have a flow bench and you were in a great place to improve the flow simply by boring the valve insert seat to .9 diamanté's of the valve and then do a back cut on the valve seat. That would give you a bigger flow gain than porting the head. cheers and nice tools.
@@muushkin Most people when porting a 4 stroke head focus on the port and narrowing the boss around the guide. but the biggest flow improvement comes from the valve seat area. Measure the valve OD diameter then bore in past the insert about 5mm exactly 0.9 of that valve diameter OD and blend into the port with grinder. Then cut the 45 degree seats and use the 30 deg top cut to position the head valve seat where you want on the valve. Then a very important step is to back cut or grind the inlet valve to 30 deg from the 45 deg seat edge towards the stem so that the valve ends up with 3 angles and the inlet seat seat ends up with 3 angles. Clear as mud I bet😁. Flows like a stream train 👍
@@mikerieck306 Small world Mike lol. I linked into your dyno Vid, impressive stuff, it sounds really quick in the higher RPM, kept the dyno operator reflexes on the ball.
Хорошо бы перед таким серьезным ремонтом заменить направляющую втулку клапана, что бы базирование пилоты было более точным, и полностью восстановить ресурс сопряженных пар трения.
I have done hundreds n hundreds of these trx heads guides also shift get loose A easier way of removing seat is to shrink it with weld basically falls out i use to use kerzan valve inserts kz3819 they are extra thinker than the average seat insert the valve height out the back is 37-37.5mm from spring bass to valve tip i also make oversized guides
I use PC air duster to freeze parts. Costs less than half of those "freeze sprays" and does the same thing. Just hold the can upside down so the liquid comes out.
I enjoyed the video and the presentation it was excellent. Not sure how accurate the machine can hold a concentric tolerance. The most important critical thing is valve seat to valve guide concentricity. What tolerance are you able to get the seat and guide to? Otherwise known as valve seat run out. Do you measure it after cutting the valve seat? There is a measuring tool that fits into the valve guide and places a finger clock DTI on valve seat and you rotate it to measure if the valve guide is concentric to the valve seat.
Valve seat concentricity can never be better than the concentricity between the valve guide and the cutter arbour. If the guide hole is worn oval, then it is better to replace the guide, and start afresh. Expensive head machines use compressed air to create a self centering effect between the tool arbour and the valve guide. When cutting starts, the tool and the work "define their own centres", and the concentricity is produced automatically. (Allowing for clearances) It isn't overwhelmingly critical, unless the parts are grossly miss-aligned, because the two working faces are conical, and tend to self align, at the expense of a little extra friction and possible valve stem and guide wear. If the oil seal on the guide is good, then you wouldn't even notice, especially on a generator.
