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Using Rope when changing valve springs

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Old Nov 25, 2005 | 07:17 PM
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Default Using Rope when changing valve springs

Does the old rope trick still work on the LS1?

Pull the spark plug, put some rope in the cylinder, turn the motor over by hand.

When the piston gets near TDC, the rope squishes and keeps the valves from falling.

Anyone still do this?

The air fitting is OK, but this way used to be fool proof.
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Old Nov 25, 2005 | 08:19 PM
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Rope will work, but the air fitting is fullproof too, with 80 psi in a cylinder, there is not way your valve drops.
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Old Nov 25, 2005 | 09:31 PM
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Old Nov 26, 2005 | 08:55 AM
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I used the TDC method, no rope. Just make sure the piston is at the top and the valve will only drop 1/4" and you can change the springs. I don't like the compressor as I had a failure once and dropped a valve. I always used the rope until this last time on the Vette and used the TDC method. I have access to a boroscope though, so ensuring the piston is at the top is easy.
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Old Nov 26, 2005 | 08:58 AM
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never tried the TDC method, seems it would be quicer than install/removing the air fitting into each cylinder
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Old Nov 26, 2005 | 09:50 AM
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The rope method worked great for me!
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Old Nov 26, 2005 | 09:54 AM
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Originally Posted by vettenuts
I don't like the compressor as I had a failure once and dropped a valve.
How did it fail??? Power went out? Hose sprung a leak? Forgot to turn the compressor on? I Simply can't see how it could fail, but maybe I'm missing something???
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Old Nov 27, 2005 | 01:49 PM
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I had to run back to my house to get a tool (I was in a neighbor's garage), compressor stopped and valve dropped. Fortunately (this was my daughter's Nissan) I had gotten to the point with that particular car that pulling the head for me was like a NASCAR team changing tires, don't ask me why
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Old Nov 27, 2005 | 07:03 PM
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Originally Posted by CYA-Vett
How did it fail??? Power went out? Hose sprung a leak? Forgot to turn the compressor on? I Simply can't see how it could fail, but maybe I'm missing something???
It can fail if while screwing the spring compressor down the valve doesn't pop out of the locks. It opens enough to release the pressure just about the time the locks popout. It happened to me twice when doing my cam swap. Both times I was lucky enough that cylinder was high enough to keep the valve from completely dropping out.
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