scottc
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| posted on 9/4/07 at 11:28 AM |
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How to remove stuck Valve collets??
Hi Guys,
Trying to remove the valves from a porsche 924 head, and the collets are firmly stuck to the valve spring retainer. I've tried shocking
'em, left them overnight with oil soaking into them, but they're stuck solid. Solid enough to break the T shaped handle on my Valve spring
compressor.
I even tried hitting them with a screw driver to turn them while the spring was compressed
Any ideas? Should I put some heat on 'em?
Happy Easter
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britishtrident
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| posted on 9/4/07 at 11:32 AM |
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Valve collets don't stick --- you need a better valve spring compressor.
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Mr Whippy
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| posted on 9/4/07 at 11:35 AM |
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ahh stop! you are suppose to put a tube over the valve retainer and hit it with a hammer first. Just get a 17mm socket and use that. You will then
find the collets will come free when compressed.
here's a link for you, scrole down for the instructions
http://www.chain-auto-tools.com/engine_tools/AMR032V.htm
[Edited on 9/4/07 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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scottc
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| posted on 9/4/07 at 11:42 AM |
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I can compress the spring by hand using a socket and piece of wood. and you can see the valve moving with the retainer.
Cheers whippy, I've stuck a socket over the retainer making sure it doesn't touch the valve, and given it a good whack.
I managed to get one valve out using a pillar drill to compress the spring, but the other 7 valves move with the retainers.
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scottc
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| posted on 9/4/07 at 11:46 AM |
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I'm using one of these
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Mr Whippy
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| posted on 9/4/07 at 11:46 AM |
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well that's a rather fancy version but just give the spring retainer a whack, you will feel the cullet let go its grip.
[Edited on 9/4/07 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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scottc
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| posted on 9/4/07 at 11:49 AM |
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well the spring compressor keeps the valve in place.
The pillar drill I put the head on the base of it. Theres no combustion chamber in the head (well very slight) so the valve sits on the base of the
pillar drill.
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Mr Whippy
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| posted on 9/4/07 at 11:54 AM |
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I've just finished putting a 24 valve engine together and had to go through the same thing. Trust me, socket on the retainer and thump it, they
will let go
Fame is when your old car is plastered all over the internet
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scottc
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| posted on 9/4/07 at 12:01 PM |
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Maybe I just need a bigger hammer 
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Mr Whippy
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| posted on 9/4/07 at 12:09 PM |
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hmm I do use a large hammer
Fame is when your old car is plastered all over the internet
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scottc
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| posted on 9/4/07 at 01:58 PM |
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Well I've broken countless bits of wood that were protecting the socket, and my makeshift workbench.
Might just have a beer now. and worry about it next weekend. lol.
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stevec
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| posted on 9/4/07 at 02:55 PM |
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Make sure the valves cant hit anything when you knock them, If they are inclined valves you can bend them if the hit the bench,
Steve,
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britishtrident
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| posted on 9/4/07 at 02:58 PM |
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Using that type the T bar is only for adjustment to suit different heads, once adjudsted you compress the spring using the the lever action.
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Mr Whippy
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| posted on 9/4/07 at 03:02 PM |
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Hit them harder
Better find a piece of tube then.
Make sure the valve can't move far or it will simply bounce on the spring. Try a piece of wood on the valve (assuming that the valves project
straight up) and hit them down firmly. I've never known this to fail, just keep trying.
Fame is when your old car is plastered all over the internet
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Peteff
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| posted on 9/4/07 at 03:53 PM |
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We used to have an old Petter single cylinder diesel with a combined block and head. The only way to get the valves out was to stand the block on a
piece of wood that fitted in the bore and press the valve spring down with two hammer shafts while someone fetched the collets out with a screwdriver.
It was driving a circular saw and what fun we had looking for the collets in the sawdust with a magnet. I usually find that if the collets
aren't coming out the spring isn't compressed enough. It says on my compressor not to use an extension on the handle How is the valve
and retainer moving when the other end of the spring compressor is on the valve head ?
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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scottc
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| posted on 9/4/07 at 05:23 PM |
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With the Spring compressor on, it was just bending (opening up) the spring compressor. The friction between the collets and spring retainer was
stronger than the tool 
I've managed to break the seal using a piece of wood under the valves, a 27MM socket which fits nicely over the spring retainer, and a bloody
great hammer
Thanks for all the suggestions guys.
Edit: forgot to say once I'd hit it enough, the spring compressor worked perfectly!
[Edited on 9/4/07 by scottc]
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