Llittle_Llama Posted June 15, 2009 Report Share Posted June 15, 2009 Has anyone done this, and is it recommended? I need to get my truck running right before I lose my new job :( Quote Link to comment
Farmer Joe Posted June 15, 2009 Report Share Posted June 15, 2009 you have to take the head off to remove a valve. theres no other way to do it. Quote Link to comment
sssr20det510 Posted June 15, 2009 Report Share Posted June 15, 2009 you can replace springs but not valves with head on Quote Link to comment
Llittle_Llama Posted June 16, 2009 Author Report Share Posted June 16, 2009 you can replace springs but not valves with head on thats what I was kind of thinking, I had never heard of that before but a guy at drill said he does it all the time. Doesn't the removal tool clamp thing kinda have to go on the underside of the head too?!? Quote Link to comment
RatRod25 Posted June 16, 2009 Report Share Posted June 16, 2009 You use compressed air to hold the vale up while you pull the springs Quote Link to comment
yellowdatsun Posted June 16, 2009 Report Share Posted June 16, 2009 Yeh, obviously you can't replace a valve without removing the head, there would be no way to retrieve the valve. If he meant just replacing valve seals, this can be done as mentioned before by pressurizing the cylinder to hold the valve up. But, if something goes wrong, you'll end up having to pull the head anyways to finish the work. So you can try it, and see what happens. Quote Link to comment
moparvwfreak Posted June 16, 2009 Report Share Posted June 16, 2009 or pull the ENTIRE bottom end apart, pull the pistons and drop the valveds out the bottom. but then yyou would be better off yanking hte head, its easier to do that. Quote Link to comment
Llittle_Llama Posted June 16, 2009 Author Report Share Posted June 16, 2009 or pull the ENTIRE bottom end apart, pull the pistons and drop the valveds out the bottom. but then yyou would be better off yanking hte head, its easier to do that. think I might do it this way, can you make a video like hainz did for me first though ;):lol::lol: Quote Link to comment
groatd Posted June 16, 2009 Report Share Posted June 16, 2009 just make sure you put the intake valve into the intake spot and not mix it up with the exhaust or u will have to do it all over again, and allso get the tourqe specs for ur head to toourqe them right or u might blow a head gasket Quote Link to comment
kennysgreen280z Posted June 16, 2009 Report Share Posted June 16, 2009 or pull the ENTIRE bottom end apart, pull the pistons and drop the valveds out the bottom. but then yyou would be better off yanking hte head, its easier to do that. Pistons don't fit out the bottom:lol: Quote Link to comment
Skib Posted June 16, 2009 Report Share Posted June 16, 2009 Pistons don't fit out the bottom:lol: lol guess your stuck just pulling the head. some times the right way is the quickest way :lol: Quote Link to comment
datzenmike Posted June 16, 2009 Report Share Posted June 16, 2009 A better, cheaper, easier and less complicated method than compressed air is to get some nylon rope and poke several feet down the spark plug hole. Crank the motor by hand toward TDC to compress the rope against the valves. Now you are free to remove springs with no chance of dropping one down the cylinder. You don't need a compressed air source or lines and fittings and you can quit for the night and just leave it. Be sure you are on the compression stroke of the cylinder you are working on. Quote Link to comment
g-mam Posted June 16, 2009 Report Share Posted June 16, 2009 replacing valves without removing the head?!? That would be like getting a tooth pulled via the rectum :eek: Quote Link to comment
Skib Posted June 16, 2009 Report Share Posted June 16, 2009 That would be like getting a tooth pulled via the rectum :eek: hahahahaha :lol: quoting that shit Quote Link to comment
banzai510(hainz) Posted June 16, 2009 Report Share Posted June 16, 2009 That would be like getting a tooth pulled via the rectum I like that one!!!!!!!!!!!!!!!! Quote Link to comment
BarryA Posted June 16, 2009 Report Share Posted June 16, 2009 Yeh, obviously you can't replace a valve without removing the head, there would be no way to retrieve the valve. If he meant just replacing valve seals, this can be done as mentioned before by pressurizing the cylinder to hold the valve up. But, if something goes wrong, you'll end up having to pull the head anyways to finish the work. So you can try it, and see what happens. the compression stroke of the cylinder where you're changing springs. You want the piston all the way up to insure that the valve can't fall into the cylinder with the spring removed, and you want it on the compression stroke so both valves are fully closed to seal the combustion chamber to keep air pressure in. The higher the continous air pressure your compressor can supply, the better the odds that the valve will stay seated while you're changing springs........ Quote Link to comment
hang_510 Posted June 16, 2009 Report Share Posted June 16, 2009 Has anyone done this, and is it recommended? no and no. but there is a first time for everything Quote Link to comment
Madness Posted June 17, 2009 Report Share Posted June 17, 2009 Jesus, just pull the head. Its not that hard. Read the chiltons manual. Quote Link to comment
72wagun Posted June 17, 2009 Report Share Posted June 17, 2009 (edited) That would be like getting a tooth pulled via the rectum :eek: :lol::lol: This is the funniest thing I read today. Exactly what I was thinking although I wouldn't have thought of putting it that way. btw, no offense to the op. I can see how you could get confused hearing a vague reference to the compressed air trick to remove valve springs. On the other hand, it might be a good idea to get some help working on the head until you get a little more basic knowledge. Edited June 17, 2009 by 72wagun Quote Link to comment
Llittle_Llama Posted June 17, 2009 Author Report Share Posted June 17, 2009 Jesus, just pull the head. Its not that hard. Read the chiltons manual. was only wanting to do one valve....kinda a reason for this ;) Quote Link to comment
Madness Posted June 17, 2009 Report Share Posted June 17, 2009 valve seal or valve? Valve, no way in hell. And if your going to be in there you may as well do them all. Quote Link to comment
Madness Posted June 18, 2009 Report Share Posted June 18, 2009 :lol: my first thought Quote Link to comment
polski ogorki Posted June 20, 2009 Report Share Posted June 20, 2009 yo shifty i just had a u67 rebuilt with new springs and everything for 280 canadian. it was done in 3 days.if your valves (or one valve?) is messed up just do the whole head!your truck deserves it and needs yer help!as kick ass as datsuns are they cant fix themselves!you owe it to yer truck to do the right thing and when yer done she will give you so much more in return! oh ya get yer self colin messers book how to keep your datsun alive! Quote Link to comment
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