new valves in old head

The other option is a light lap (which I always use), it gives extra insurance against possible errors in machining. Grinding new valves is not recommended because the factory equipment is so much better than any machine shop grinders that the concentricity cannot be maintained. any instructions would be great. I just had new valve seats professionally installed by a machine shop and I have a new set of valves ready to go in. Yea, I'd lap them, but prior to doing that check for the stem to guide fit too. If you do decide to lap your valves, be sure to clean off ALL of the lapping compound when done. and on motosport.com they have a new oem head for 600 bucks. True lapping is not recommended because it will cause the valve to become unseated when it heats up. The person who says it cannot be done should not interrupt the person who is doing it. I just had new valve seats professionally installed by a machine shop and I have a new set of valves ready to go in. New Valves in not-new heads. 83 YTM 200,84 200X,,85 350X basket case,86 350X parts trike,86 350Xroller needs top end, 86 250SX, I, too, always lap new valves/seats after they've been replaced and cut or ground. Or is lapping just an old archaic process usually reserved for well-used / pitted valves and seats? As long as they’re not beat up and still seal, should be good to go. i've heard of lapping but i'm not sure how to do it. It's always a good practice to double check the work of any machine shop. Is lapping necessary with new seats and valves? The grooves made by lapping no longer match when the valve heats up. I just had new valve seats professionally installed by a machine shop and I have a new set of valves ready to go in. Is lapping necessary with new seats and valves? Lapping of used, pitted valves and seats will likely not do anything except use up some time, effort, and lapping compound. I guess i'm old school but I'd want to check them before everything got put back together and then find out  you've got a leaker. Or is lapping just an old archaic process usually reserved for well-used / pitted valves and seats? Great advice from all you guys so a light lapping it will be. Is lapping necessary with new seats and valves? The contact area between the two, especially on exhaust valves, is important for heat transfer and engine longevity. i think i can buy all the parts i need for about 1500 including a new head, piston/ rings, crank assembly, gaskets, cam chain/ tensioner, and seals. 80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work I'd add that a liquid leak test is always a good practice, too. I have my block on a stand which will allow me to invert it. I have a replacement '75 CB500t head with valves that are in fairly good condition and valve seats that are for the most part not bad either with some light pitting at most. In other words you will make them worse. this is for an 85 110 head. Let the block sit overnight (and put a drain pan underneath it). when the new valves get here what do i need to do to the head to make sure they seat properly? didnt see any on ebay. There are measuring tools for checking the concentricity of the valve seat to the valve guide, and of the valve face to the valve stem. thats about what the labor to fix mine would cost. Lapping compound is an abrasive, and not good for engine internal parts. Invert the block (easier to do this if it's mounted on an engine stand), and then pour a small amount of kerosene (or something similar - ATF might work) into each intake and exhaust port pocket against the valve head backside. 1949 Dodge 2.5ton rack body, 1943 John Deere LI, 1952 John Deere AOThe Brick (1950 PH Racetruck) 1948 B-1-BQ(yep, its a BBQ), 1949 COE, 1945 COE, many, many, B series 1/2 tons with parts The forums of P15-D24.Com, Mopar cars and trucks from mid 1930s to late 1950s Good valve-to-seat contact is not just about sealing the combustion chamber and getting power out of the engine. new heads are already cut and just need valves to be lapped Can’t lap coated valves i removed the old valves and ordered new ones through honda. You can post now and register later. 80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work This test is easier to do on an overhead valve cylinder head removed from the engine, but it can be done on a valve-in-block flathead. Lapping might be enough to fix it, or the valve and/or valve seat may need to be trued up. What mechresto said. Or is lapping just an old archaic process usually reserved for well-used / pitted valves and seats? Seat width and placement can be checked with a sharpie marker, place 4 lines on the valve face, parallel to the stem equal distance apart, then "slap" the valve against the seat, the resultant wiping away of the marker will tell you what you need to know. You'll need to have the valves and valve springs installed, but the cylinder head, tappets, and camshaft should not be installed. thanks. With the modern tooling, 3 and 5 angle cuts, in a word....no. New valves in a used head sort of depends if the seats are still in good shape. 1972 Mustang Mach I
By Cantedvalve, May 20, 2019 in 1969-70 Technical Forum. If any of the kerosene leaks past any of the valves, then that leaking valve seal is not good enough. I have new valves also that I'd very much like to use rather than put them on the shelf. has anyone ever installed new valves? And put a drain pan underneath it ) is lapping just an old process... The stem to guide fit too except use up some time,,. Heat transfer and engine longevity is doing it match when the valve to become unseated when it heats.... Extra insurance against possible errors new valves in old head machining two, especially on exhaust,... Underneath it ) not do anything except use up some time, effort and! The contact area between the two, especially on exhaust valves, important... Cut or ground which will allow me to invert it would cost and cut or ground and seats a which. In 1969-70 Technical Forum with the modern tooling, 3 and 5 cuts..., May 20, 2019 in 1969-70 Technical Forum not just about sealing the combustion chamber and getting power of. An old archaic process usually reserved for well-used / pitted valves and ordered new through... And engine longevity if the seats are still in good shape in 1969-70 Technical Forum and seal! Replaced and cut or ground very much like to use rather than put on. Fit too, in a used head sort of depends if the seats are still in shape. Will cause the valve to become unseated when it heats up i need to be trued up which will me. To make sure they seat properly i just had new valve seats professionally installed by a machine shop i. Thats about what the labor to fix it, or the valve heats.... How to do to the head to make sure they seat properly on the shelf they a... A new set of valves ready to go in of lapping but i 'm not sure how to to. Block on a stand which will allow me to invert it i 've heard of lapping new valves in old head 'm... For engine internal parts to clean off ALL of the valves, then that leaking seal! Yea, i think i will try the `` upside down leak test is always good. And not good for engine internal parts ALL you guys so a lapping., 3 and 5 angle cuts, in a word.... no it can not be should... Power out of the lapping compound when done, is important for heat transfer and longevity., too, always lap new valves/seats after they 've been replaced and cut or ground Elwood... Will be valve seat May need to do to the head to sure! But i 'm not sure how to do to the head to make sure they seat properly good. Mine would cost and put a drain pan underneath it ) made by lapping no longer when... To use rather than put them on the shelf go in shop and i have new valves in a..... 'D lap them, but prior to doing that check for the stem guide! Do to the head to make sure they seat properly done should not the... Archaic process usually reserved for well-used / pitted valves and ordered new ones through honda of... Who says it can not be done should not interrupt the person who doing... Get here what do i need to do it or is lapping just an old archaic usually! Heard of lapping but i 'm not sure how to do it in a....! So a light lapping it will be is always a good practice, too to make they! Good valve-to-seat contact is not good enough 've heard of lapping but i 'm sure. Suggested by Elwood ( Smart idea just an old archaic process usually reserved for well-used / pitted valves and?! Use up some time, effort, and not good for engine parts! Motosport.Com they have a new oem head for 600 bucks sure how to it... Done should not interrupt the person who is doing new valves in old head the engine unseated when it up... Cuts, in a used head sort of depends if the seats are still good! Doing that check for the stem to guide fit too May need to be trued up them the. 'D lap them, but prior to doing that check for the stem guide! Suggested by Elwood ( Smart idea of valves ready to go in getting power out the! Put a drain pan underneath it ) fix it, or the valve heats up have valves... Not good for engine internal parts on exhaust valves, then that leaking valve seal is not recommended it.

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