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No3 spark plug thread stripped
Moderators: KeithZ1R, chrisu, paul doran, Taffus
this is the kit i use it does have the pilot nose tap which makes it a piece of cake to use. if you want to do other work on the motor by all means go ahead & remove the head otherwise it will be expensive & time consuming job when there is no need to remove the head. if you follow my instructions trust me it will be fine its the difference between a 15 minute job or a 3 hour job plus parts for an expert 8 hours for your average enthusiast & 2 days for a numpty & possible more when he puts it back together without timing it up & bending the valves
zed1015 wrote:
Just go slowly , set the piston as close as to tdc as possible while the ex valve is still open and periodically give it a blow out with the air line.
Lightly use some cutting fluid on the tap but not grease that can stick swarf inside the cylinder and prevent it from getting blown out.
Spot on!..Did this on mine,absolutely no problems.
DavidZ1R wrote:My Z550 project had exactly the same problem, on the same cylinder, the previous owner left the plug in sealed, when I took the head off the piston was pitted to fcuk, new piston and rings, then I had the thread helicoiled, been ok to date.
Yep a guy in Wigan did it for me, charged £5, bargain
CB125 GT380 CB750F1 Z1R GPZ 750 Turbo Z1R
Heard of a technique once for changing valve stem seals without taking off the head seem to recollect was to do with feeding rope into the plug hole to keep the valve up while you changed the seal? sure some one will be able to elaborate....
PAULJAC47,,,,,"She may not look like much, but she's got it where it counts, kid."
-Han Solo
You can't polish a turd, but you can roll it in glitter
Salad is what real food eats.
Anon
PUM 673
-Han Solo
You can't polish a turd, but you can roll it in glitter
Salad is what real food eats.
Anon
PUM 673
Heres another technique using balloons....
Changing a valve spring doesn't have to be a nightmare. It doesn't mean you have to take the heads and intake off. In fact, most people simply use one of several methods to do this and keep the heads on the car. The valve springs control the valve rising back up to the closed position. A weak, tilted, or broken spring can mean the difference between a healthy engine and one that gets very messed up. A valve spring that breaks can even drop your valve into the engine while it is running, which is catastrophic. Good preventative maintenance can help this. This article will specifically relate to older Chevrolet engines.
There are several ways you can change a valve spring without removing the heads. The first is with almost no specialty tools at all. Simply remove the valve cover as normal, generally with four bolts holding it in place. Then remove all spark plug wires and spark plugs. Next, you have to manually rotate the engine using the 5/8" bolt on the front of the harmonic balancer. The objective here is to get each piston to top dead center, or TDC. While you are changing the spring, if each piston is at TDC and the valve falls, it will not have enough clearance to fall completely into the engine. It is difficult to tell when the piston is at TDC if you are working alone, so there is a simple trick. Any auto parts store sells an adapter to plug into an air compressor and your spark plug hole. By taping a balloon on the end, you can tell which way the piston is moving. If the balloon is getting air sucked out, you can be sure the piston is on the way down, and vice versa. Therefore, when the balloon fills up, keep rotating the engine by hand until the balloon starts to get the air pulled back out. The second this happens, stop turning. The piston is at TDC.
The other method involves the same air compressor to spark plug socket adapter. Simply plug in an air compressor, turn it on, and let the 80-90 PSI inside the chamber hold the valve up. The only problem is that the air compressor has to maintain at least 30-40 PSI to hold the valve up the entire time you are changing each spring. Any less, and you will be removing the heads to retrieve the valve.
Now, we can proceed with the valve springs. Remove all the rocker arms and pushrods, and inspect them all to make sure they are straight. Next, you will need a tool known as a valve spring compressor. They make these in all shapes and sizes, and the simplest one is around ten dollars. It bolts onto the rocker stud and uses simple leverage to compress the spring while being removed. Simply bolt this on and compress the spring. There are two half-moon retainer clips on the sides of the valves that hold the valve spring in place. A telescoping magnet is almost required to make sure you don't lose these. Also, since the retainers can get stuck, a socket and a small hammer can be used to loosen them. Put the socket around the retainer and tap with the hammer.
When the retainers come out, simply pull the spring out and inspect it. Replace it with the new one, put the retainers back in (also very annoying) and reassemble and readjust the rocker arms and pushrods. When you are done, put everything back together and enjoy the great feeling of a well-running engine.
Changing a valve spring doesn't have to be a nightmare. It doesn't mean you have to take the heads and intake off. In fact, most people simply use one of several methods to do this and keep the heads on the car. The valve springs control the valve rising back up to the closed position. A weak, tilted, or broken spring can mean the difference between a healthy engine and one that gets very messed up. A valve spring that breaks can even drop your valve into the engine while it is running, which is catastrophic. Good preventative maintenance can help this. This article will specifically relate to older Chevrolet engines.
There are several ways you can change a valve spring without removing the heads. The first is with almost no specialty tools at all. Simply remove the valve cover as normal, generally with four bolts holding it in place. Then remove all spark plug wires and spark plugs. Next, you have to manually rotate the engine using the 5/8" bolt on the front of the harmonic balancer. The objective here is to get each piston to top dead center, or TDC. While you are changing the spring, if each piston is at TDC and the valve falls, it will not have enough clearance to fall completely into the engine. It is difficult to tell when the piston is at TDC if you are working alone, so there is a simple trick. Any auto parts store sells an adapter to plug into an air compressor and your spark plug hole. By taping a balloon on the end, you can tell which way the piston is moving. If the balloon is getting air sucked out, you can be sure the piston is on the way down, and vice versa. Therefore, when the balloon fills up, keep rotating the engine by hand until the balloon starts to get the air pulled back out. The second this happens, stop turning. The piston is at TDC.
The other method involves the same air compressor to spark plug socket adapter. Simply plug in an air compressor, turn it on, and let the 80-90 PSI inside the chamber hold the valve up. The only problem is that the air compressor has to maintain at least 30-40 PSI to hold the valve up the entire time you are changing each spring. Any less, and you will be removing the heads to retrieve the valve.
Now, we can proceed with the valve springs. Remove all the rocker arms and pushrods, and inspect them all to make sure they are straight. Next, you will need a tool known as a valve spring compressor. They make these in all shapes and sizes, and the simplest one is around ten dollars. It bolts onto the rocker stud and uses simple leverage to compress the spring while being removed. Simply bolt this on and compress the spring. There are two half-moon retainer clips on the sides of the valves that hold the valve spring in place. A telescoping magnet is almost required to make sure you don't lose these. Also, since the retainers can get stuck, a socket and a small hammer can be used to loosen them. Put the socket around the retainer and tap with the hammer.
When the retainers come out, simply pull the spring out and inspect it. Replace it with the new one, put the retainers back in (also very annoying) and reassemble and readjust the rocker arms and pushrods. When you are done, put everything back together and enjoy the great feeling of a well-running engine.
PAULJAC47,,,,,"She may not look like much, but she's got it where it counts, kid."
-Han Solo
You can't polish a turd, but you can roll it in glitter
Salad is what real food eats.
Anon
PUM 673
-Han Solo
You can't polish a turd, but you can roll it in glitter
Salad is what real food eats.
Anon
PUM 673
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