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Is there some way to compress a valve spring #59332
05/18/08 09:12 PM
05/18/08 09:12 PM
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BassMan Offline OP
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Is there some way to compress a valve spring without taking the head off the engine? The intake valve on the #1 cylinder of my A12 Roadrunner has slipped down and the top is now flush with the retainer. I was hoping there is some way to compress the spring and pull it up without taking off the head.

Re: Is there some way to compress a valve spring [Re: BassMan] #59333
05/18/08 09:25 PM
05/18/08 09:25 PM
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mark7171 Offline
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hughesengines.com makes a $65 tool.





Last edited by mark7171; 05/18/08 09:27 PM.
Re: Is there some way to compress a valve spring [Re: BassMan] #59334
05/18/08 09:28 PM
05/18/08 09:28 PM

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putting rope through the sparkplug hole and bringing the piston to TDC works pretty well.
also knocking the porcilan(sp?) off a plug and brazing a airline fitting works too.

Re: Is there some way to compress a valve spring [Re: BassMan] #59335
05/18/08 09:28 PM
05/18/08 09:28 PM
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BRawls Offline
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Any auto parts stire will have a single spring compresor. It fits on th espring and then you tighen it and the spring compresses. Only $15-$20

Re: Is there some way to compress a valve spring [Re: BRawls] #59336
05/18/08 09:33 PM
05/18/08 09:33 PM
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petaluma,ca. u.s.a.
west Offline
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taking the spring out is easy,you need to worry about keeping the valve in place.

Re: Is there some way to compress a valve spring [Re: west] #59337
05/18/08 10:16 PM
05/18/08 10:16 PM
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mopar346 Offline
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Fill the cylinder with nylon rope as mentioned and then roll it to the top, that will keep the valve in place. Take a 3/4 socket and a hammer and "pop" the retainer before you use the spring compressor, sometimes the retainers stick and this will brake them loose-I have had them come completely off when I do this, so make sure the valve is held in place first. The single spring unit is the cheapest and works well with most set up.


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Re: Is there some way to compress a valve spring [Re: west] #59338
05/18/08 10:17 PM
05/18/08 10:17 PM

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A valve cannot "slip down" if the valve spring/ retainer/ is all hooked up, the SPRING keeps the valve up. So if the valve is "slipped down" that means the clips must have come out?

You need to tell the whole story, here.

Also, KD tool used to make one that twisted to operate, it would work on many kinds of engines.

Keeping the valve up is easy with compressed air. Just take apart your compression gauge, or else make one from an old spark plug.

You sure you didn't break something or bend a valve?

Re: Is there some way to compress a valve spring #59339
05/18/08 10:32 PM
05/18/08 10:32 PM
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mopar346 Offline
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One thought to using a rope verses air is you don't have to worry about leaving it overnight to get parts. 440sixpack is right though, valves don't drop in the retainer, the grooves are interlocked and only fit one way. What does the cooresponding rocker look like on the contact pad?


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Re: Is there some way to compress a valve spring [Re: mark7171] #59340
05/19/08 08:10 AM
05/19/08 08:10 AM
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torkrules Offline
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Quote:

hughesengines.com makes a $65 tool.









Comp cams sells the same tool and it works awesome. I'll tell you what I do (worked with my 500 wedge and Hemi), but I'm sure there will be much wailing and nashing of teeth.

First I tap all of the retainer with a socket. Then bring the piston up to top dead center for the cylinder I'm working on. Install your favorite valve spring tool. Gently pry on the spring until the valve contacts the piston. The retainer will break free and you can remove the locks. The piston stop the valve from falling in too far.

Re: Is there some way to compress a valve spring [Re: torkrules] #59341
05/19/08 09:25 AM
05/19/08 09:25 AM
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petaluma,ca. u.s.a.
west Offline
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hey sixpack,show me how you remove a spring with the retainer in place

Re: Is there some way to compress a valve spring [Re: west] #59342
05/19/08 11:36 AM
05/19/08 11:36 AM
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BassMan Offline OP
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Thanks for the info everyone. To make a long story short, the engine got revved up to 10,000 rpm for several seconds and immediately therafter had a tapping noise. When I pulled the valve cover I found 1 rocker had about 1/8" play and the top of the valve flush with the retainer. The rocker looks good. Is there a split ring washer which holds the valve in place?

Re: Is there some way to compress a valve spring [Re: BassMan] #59343
05/19/08 11:57 AM
05/19/08 11:57 AM
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JohnRR Offline
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Quote:

Thanks for the info everyone. To make a long story short, the engine got revved up to 10,000 rpm for several seconds and immediately therafter had a tapping noise. When I pulled the valve cover I found 1 rocker had about 1/8" play and the top of the valve flush with the retainer. The rocker looks good. Is there a split ring washer which holds the valve in place?




is this a stock 440 ? if so it went into valve float several thousand RPM below that with it's hydralic cam ...

there is a pair of half circle locks that set down inside retainer , for the valve to have moved down the locks are damaged or the retainer , or both .

you can buy an inexpensive compressor at a local sears store , use something to hold the valve from dropping in the cylinder ...

Re: Is there some way to compress a valve spring [Re: BassMan] #59344
05/19/08 12:04 PM
05/19/08 12:04 PM
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Pacnorthcuda Offline
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Quote:

Thanks for the info everyone. To make a long story short, the engine got revved up to 10,000 rpm for several seconds and immediately therafter had a tapping noise. When I pulled the valve cover I found 1 rocker had about 1/8" play and the top of the valve flush with the retainer. The rocker looks good. Is there a split ring washer which holds the valve in place?




The valve locks at the top of the valve look like two half-circles. When you compress the spring with force on the retainer locks will be visable and easily removed. Interesting what happened--are you thinking just the valve stem was destroyed? I am surprised the rocker looks good. Or did the lock fail? Doesn't sound like wiped lobe simply because that wouldn;t explain the top of the valve being flush with the retainer.

Re: Is there some way to compress a valve spring [Re: Pacnorthcuda] #59345
05/19/08 12:14 PM
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BassMan Offline OP
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It does have a hydraulic cam. It appears that the locks may have failed, at least I'm hoping that is all that happened. But the next question is would the valve and/or piston be damaged by possible contact?

Re: Is there some way to compress a valve spring [Re: BassMan] #59346
05/19/08 12:41 PM
05/19/08 12:41 PM
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torkrules Offline
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Quote:

Thanks for the info everyone. To make a long story short, the engine got revved up to 10,000 rpm for several seconds and immediately therafter had a tapping noise. When I pulled the valve cover I found 1 rocker had about 1/8" play and the top of the valve flush with the retainer. The rocker looks good. Is there a split ring washer which holds the valve in place?





10,000! Might not be a bad idea to check out a few other things (bearings, block, etc). My feeling is that 7000 would be tops unless your using ultra light weight parts, good oiling system, etc.

Re: Is there some way to compress a valve spring [Re: torkrules] #59347
05/19/08 01:33 PM
05/19/08 01:33 PM
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JohnRR Offline
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Quote:

Quote:

Thanks for the info everyone. To make a long story short, the engine got revved up to 10,000 rpm for several seconds and immediately therafter had a tapping noise. When I pulled the valve cover I found 1 rocker had about 1/8" play and the top of the valve flush with the retainer. The rocker looks good. Is there a split ring washer which holds the valve in place?





10,000! Might not be a bad idea to check out a few other things (bearings, block, etc). My feeling is that 7000 would be tops unless your using ultra light weight parts, good oiling system, etc.




hyd cam , stock build , the valve train failure happened because of serious valve float which probably happened just under 700rpm unless this was a purpose built motor , meaning super stock or a PS drags contender .

i'd be looking at them ALL , not just that one .

damaged to the piston and valve might have occurred , a leak down test will tell you if the valve is bent and not closing from piston contact .

if its got stock 69 spec pistons i doubt there was piston to valve contact with that piston .040ish in the hole .

Re: Is there some way to compress a valve spring #59348
05/19/08 01:59 PM
05/19/08 01:59 PM
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GoodysGotaCuda Offline
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ive taken my compression tester, took the gauge off and hooked my air compressor line to it to hold pressure in the cylinder...

...and 10,000rpm!? Thats no street bike







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