Valve Spring Compressor - Wrist Twisters
 
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post #1 of 16 Old 03-14-2009, 06:34 PM Thread Starter
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Valve Spring Compressor

I have a 74 Z1, that is getting it's 35 year "cleaning". The no.2 exhaust valve seal is bad, so I would like to change them all, with out taking off the head. Does anybody know of a valve spring compressor that would work for this?
Dave

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post #2 of 16 Old 03-17-2009, 03:46 PM
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Quote:
Originally Posted by daveb View Post
I have a 74 Z1, that is getting it's 35 year "cleaning". The no.2 exhaust valve seal is bad, so I would like to change them all, with out taking off the head. Does anybody know of a valve spring compressor that would work for this?
Dave
If I recall correctly KD tools used to make a small tool with two jaws that would grab the lower portion of the spring and you would screw the top down compressing the retainer. An adapter was used in the spark plug hole and compressed air was pumped in the cylinder at TDC to hold the valves on their seats. Of couse this only works if the valves are sealing. I did this a couple of times about thirty years ago. I don't own the tool, and I can't remember who I borrowed it from when I did it. Good luck, Chris.

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post #3 of 16 Old 03-19-2009, 10:10 AM Thread Starter
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Thanks Chris, but the tool you are thinking of is for automotive applications. I've used it many times. The valves are deep in the head so that tool won't fit

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post #4 of 16 Old 03-19-2009, 11:07 AM
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Plan B?

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post #5 of 16 Old 03-19-2009, 11:30 AM
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Dave, I can't recall what the inside of those Kawasaki heads look like. If you can find some fixed point, ideally threaded areas in proximity to the valve, maybe something homemade that would allow you to compress the retainer while the valve is held closed by air pressure would do the job. Even if these threaded areas are useable, one would still have to be concerned with aluminum threads that have been thermally cycled for over thirty years and the relative diameter and depth of the holes, and whether they could handle the tension necessary to compress the spring and free the retainer.

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post #6 of 16 Old 03-20-2009, 07:43 PM Thread Starter
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I'm going to try to fabricate something tomorrow. No turning back now, I took the cams out last night. Plan B is taking off the head, which I don't want to do at this point. I did order a complete gasket set last night, just in case.

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post #7 of 16 Old 03-22-2009, 06:56 AM
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Good Luck!

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post #8 of 16 Old 03-24-2009, 12:44 PM Thread Starter
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All done! We made a tool out of 1" PVC pipe. It's a 2 man job, and you need a air compressor, and adapter for the spark plug hole to keep the valves shut. We turned down the outside to make a shoulder that just fit in the valve spring pocket.
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post #9 of 16 Old 03-24-2009, 12:51 PM
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We... as in Spinelli? Any pics of the age old seals?
Glad you were able to get the job done

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post #10 of 16 Old 03-24-2009, 01:20 PM Thread Starter
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Tomorrow I can post some. They were real hard to get off, and also the rubber was hard around the valve

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post #11 of 16 Old 03-24-2009, 09:58 PM Thread Starter
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And yes, "we" were Spinelli. The man's a genius. As promised the old seals.
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post #12 of 16 Old 03-25-2009, 07:41 AM
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Nice job Dave! Sometimes the jobs are more satisfying when we complete them with fabricated tools.

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post #13 of 16 Old 03-25-2009, 07:44 AM
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Spinelli is a genius when it comes to anything mechanical. I hear the Z1 is looking real good...

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post #14 of 16 Old 03-25-2009, 11:28 AM Thread Starter
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This is what it looked like as I was taking it apart. A lot isn't rust it's cement dust from my garage.
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post #15 of 16 Old 03-25-2009, 11:34 AM Thread Starter
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This is a poor view from the left side. I did a lot with 3M ScotchBrite
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post #16 of 16 Old 03-25-2009, 01:00 PM
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Another way to keep the valves closed besides compressed air is to feed a bunch of clean, small rope (cord) into the cylinder through the spark plug hole (leaving some sticking out so you can pull it back out later) and then rotating the crank to bring the piston up and lightly compress the rope in the cylinder, thereby holding the valves against their seats. I've done this in car & motorcyle engines when I didn't have the equipment to use compressed air.

I've also used a deep well socket and a hammer to remove the valve spring retainers easily and quickly, and have made spring compressors to re-assemble them from flat bar stock, making a "pry bar" type compressor that works pretty well.

Good job on your solution, the most important part of any tool is that it works!

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