Q:The valve on my mountain bike tire has a leak, so I want to go buy a new valve (and maybe a couple spares)... how much is the average cost?Thanks!

Just buy a new tube, I don't even think you can/want to replace the valve on a bike tube. $5 maybe.

Q:I pulled the vaccuum line off the valve and nothing happened. I revved the engine and held it a higher rpm and still nothing happened(no vaccuum). Does this mean that the egr valve is bad. I have been having a problem with rough idle, and keeping the car running at a stop sign. I have already changed the pcv valve and that seemed to help a little. Thanks

You have likely got a bit of carbon in the EGR that you can clean after you remove it, I usually spray some penetrating oil into the valve hold my finger over the hole that I sprayed into and turn the valve over, if it leaks the seat is dirty and cleaning the carbon out may help. also push up on the plunger several times to be sure that it doesn't stick alternate carb cleaner with penetrating oil until the valve is free and no longer leaks when inverted. As far as your question the test you described doesn't test the EGR or the EGR solenoid correctly at all. On some the car needs to be in gear to actuate the EGR, all you need to do is check that there is vacuum to the solenoid and that the EGR valve works freely. If the EGR fails to work the check engine light should be on and you can check the code to get a clue as to why.

Q:I got a 318 V8.. I cant seem to locate the valve cover to replace... but I did notice that some of the replacement gaskets/filters are from the 91-93 dodge ramcharger.. Is it possible for an newer model to fit exactly on my 1989? are all dodge 318 the same size?

Virtually speaking yes, the engine size or displacement is the same on all 318 engines. You can obtain a newer valve cover which will fit your 89.

Q:The shutoff valve for the hot water under my bathroom sink has a very tiny leak. It is coming from where the turn knob meets the valve.So long as the valve is either all the way open or all the way closed, all I get is a single drop every couple seconds. But if it is anywhere in-between, it is a pretty steady drip.What's the simple/quick fix for this? Replacing the entire shutoff valve is probably not an option because it is an apartment complex.

The packing around the compression nut where the valve stem enters the valve body needs a twist or two clockwise. Take a small crescent adjustable wrench, and tighten this nut to the right. Should stop the leak. If not, you may have to replace valve but usually this simple fix works. NOTE: If you tighten it to much, you won't be able to open or close the valve, so use just enough effort to stop the leak without needing the incredible hulk to budge the valve.

Q:My new Trek 1000 has a type of valve stem different from the standard (car type) stem on my mountain bike. Do I need an adaptor to fit it to a pump or do I need a whole new pump? Also, have you seen a tire gauge that fits this stem type?

You can buy a little adaptor that screws onto the valve stem so that you can use your present pump and gauge with this type of stem. The adaptors cost about $1 or so. Get two because if you're like me, you'll lose one.

Q:large veins contain one way valves, which keep the blood flowing in one direction. why dont large arteries need similar valves?

In depth answer is: The Arterial Valves The semilunar valves are mere membranous pockets, and have no tendinous cords attached to them; but on account of the extent of their convex attachment, when their free margin is made tense by the pocket being filled from the artery, the valves can only pass a given distance from the wall of the vessel and are thus held firmly in position. The force of the blood leaving the ventricle distends the vessel and pushes its wall away from the less elastic valve. When the force begins to diminish, the blood passes behind the semilunar flaps and raises them from the wall of the distended artery. The moment the current from the ventricle has ceased to flow, the pockets are forced back by the aortic blood pressure and bulge into the lumen of the vessel, so that the convex surface of the lunated portions of each valve is pressed against corresponding parts of its neighbors. Their union, which is accomplished by their overlapping to some extent, forms three straight radiating lines, and is a perfectly impervious barrier to any backward flow of blood

Q:my valve cap is leaking slowing how do i fix it what part do i need

The cap on the valve is just a dust cap designed to keep dirt out of the valve. To determine if the valve is leaking, move the car until the valve is at the bottom pointing up. Put a little water into the valve and watch for bubbles. Bubbles confirm the valve is leaking. You could try replacing the core with a little valve wrench (you will lose all the air in the process) or go to a service center and have them replace the valve. You cannot replace the valve yourself. If no bubbles, you have a leak in the tire or where the tire joins the wheel. Any tire service center can find and fix the leak.

Q:what is the reason for a 30 degree angle valve cut ? should i have this done on a Street performer 351 windsor with stock street heads and a mild cam?

Makes the intake and exhaust flow smoother.

Q:Some trombones have Thayer valves? What are those for compaired to the regular standard open wraps?

open wrap is a design for less backpressure through the valve,....the thayer valve reduces that backpressure even more. go play different pro horns side by side, vary the brand/valve combinations and see what plays the most free (especially in the low to pedal range).personally i play an old bach 42k and i love it.

Q:The hot water in my bathroom is leaking from the faucet. I've shut off the valve below the sink, but it continues to dribble out. Also, there appears to be some rust build-up. Could that account for a failing valve?

It sounds like your shutoff valve is not working properly. You need to shut off the hot water at the main valve where it comes out of the water heater (this will shut off all hot water in the house); drain the line (there's a little knob on the main shutoff valve you can twist that will allow the water in the pipe to drip out), then replace the shutoff valve. The shutoff valve is probably threaded pipe and can be loosened using two wrenches (hold the pipe with one wrench and twist the nut with the other - you want to conteract the twisting motion on the pipe so the pipe does not weaken and burst, which is why the one wrench needs to hold the pipe). once the valve is removed, clean the pipe threads with a wire brush and cleaning solvent to remove the rust and install the new valve. Be sure to read the manufacturer's directions to see if you need to wrap the threads with teflon tape first. When the valve is replaced, you can turn on the main hot water valve at the water heater; then use the new shutoff valve when you prepare to repair or replace the faucet. I would expect the faucet is leaking due to worn out washers, you can take it apart and tell. I susupect the rust you see is a result of the leak and not the other way around.