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I will be replacing my valve springs soon. I am going to hook up my compressor with 150 psi, to the spark plug hole. Has anybody ever had a valve drop into the cylinder using that much pressure?
Thank you. Did you keep the piston at, top dead center?
I did not because it depends on what type of "keeper" release tool you are using. I used a spring compressor that does not place any load on the retainer or the valve , I did not spin the crank at all using this type as I was confident that the air would hold up the valve and it was much easier because I did not have to bring each piston up to TDC , See below
But some of the others are like a lever that push down on the top of retainer to release the keepers , if you are using one of those I would spin the crank if you are worried about dropping a valve
I have 20,000 on my new engine so i am probably going to be doing the same soon
once you put air into the cylinder it is going to push the piston to the bottom it wont matter if it starts at tdc just dont loose air pressure or the valve will drop
once you put air into the cylinder it is going to push the piston to the bottom it wont matter if it starts at tdc just dont loose air pressure or the valve will drop
It's important to keep constant air in the cylinder while changing the springs...!!! If it makes you feel more comfortable, you can definitely put the pistons at Top Dead Center, however it's not necessary. I've done it many times over the past 25 years.
It's important to keep constant air in the cylinder while changing the springs...!!! If it makes you feel more comfortable, you can definitely put the pistons at Top Dead Center, however it's not necessary. I've done it many times over the past 25 years.
Yep , same here .....
Even if you remove all the sparkplugs ... 100 to 160 pounds of air will NOT push the piston down lol lol
I did not because it depends on what type of "keeper" release tool you are using. I used a spring compressor that does not place any load on the retainer or the valve , I did not spin the crank at all using this type as I was confident that the air would hold up the valve and it was much easier because I did not have to bring each piston up to TDC , See below
But some of the others are like a lever that push down on the top of retainer to release the keepers , if you are using one of those I would spin the crank if you are worried about dropping a valve
I have 20,000 on my new engine so i am probably going to be doing the same soon
Good Luck ,
Dave
What is the issue that makes you want to change the springs on your "new engine"?
What is the issue that makes you want to change the springs on your "new engine"?
Jim , I drive my car everywhere plus I race it. I just dont trust the springs , original motor popped a yellow spring at around 30,000 miles and I am at 64,000 , and while they are blues ..... I am a little bit worried
If you have an upgraded cam, you race it, and hit high RPM, it's always a good idea to change valve springs around 15,000, miles. On my drag car that makes 900 horsepower, and sees 8,000 RPM, I change valve springs every 250 passes. On my street car that makes 750 NA horsepower, every 15,000 mi they will be changed. If you break a valve spring and don't catch it in time, you'll most likely wipe out the lifter and possibly camshaft, that is if you are running double valve springs like I always do! Obviously if you're running single valve springs a broken valve spring equals a broken motor!
I tested the air hose hooked up to cylinder 1, all I got was air bypassing the valves. Obviously, the piston needs to be in a specific position. I get the correct wrench today to adjust the crank position. The piston needs to be on the power stroke with both valves closed. Looking at the pushrods, both would be full down.
2014 with 38,000 miles. Mobil 1 0W-40 Supercar oil. Changed every year. I put about 4000 miles a year on the car, so I just do it yearly.
I don't use Top Tier gas, that has the required, extra cleaning agents in it, so I use a few ounces of Techron fuel system cleaner every time I fill up.
2014 with 38,000 miles. Mobil 1 0W-40 Supercar oil. Changed every year. I put about 4000 miles a year on the car, so I just do it yearly.
I don't use Top Tier gas, that has the required, extra cleaning agents in it, so I use a few ounces of Techron fuel system cleaner every time I fill up.
Thanks for the info, your technique is obviously keeping things clean. I follow the OLI or a little more often if the timing is more convenient, and that gets me a change every 4k-6k miles, so about twice per year.
Currently at 66k miles. I'll be pleased if mine is as clean as yours but hoping to never find out. I too switched to the 0W-40 when it was approved, since I do autocross and an occasional track day.
Yes, obviously the Valves need to be closed when we insert air into the cylinders before changes springs!...
Good job doing your own maintenance! ...👍🏻👊🏻🏁🏁
Valve spring replacement.
