Broken valve spring retainers found while doing valve adjustments - Kawasaki ZX-10R.net
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post #1 of 139 Old 03-05-2010, 10:53 PM Thread Starter
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Broken valve spring retainers found while doing valve adjustments

Well, went to check the shim sizes and finish up the valve adjustment we've been working on the last few days.. I had one intake valve that was on the tight side (still in spec though) so I figured I'd re-shim it and put it back to stock spec.

Well, come to find all but one of the valve spring retainers on the intake valves are busted.

I don't understand what could have caused this.

Luckily, it didn't drop any valves but now I've got a bunch of work to do.

Does anyone know if you can pull the retainers off of the valves without removing the head?

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post #2 of 139 Old 03-05-2010, 10:56 PM
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Mother of god. How the fck does that happen?
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post #3 of 139 Old 03-05-2010, 10:58 PM Thread Starter
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I have no idea :(

In one way, i'm glad i found it before it dropped a valve, but WTF caused it?
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post #4 of 139 Old 03-05-2010, 11:11 PM
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I don't know what causes it (faulty design?) but I've read about a few guys discovering it. It really makes the Carpenter keepers look attractive.
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post #5 of 139 Old 03-05-2010, 11:13 PM
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[QUOTE=Vio;1402612]
Does anyone know if you can pull the retainers off of the valves without removing the head?



Yes. Compress the cylinder with air. Make sure to drop the oil pan , clean the pick up, and flush the motor . Need to get the pieces of retainer out.
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post #6 of 139 Old 03-05-2010, 11:21 PM Thread Starter
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Any tricks to removing the retainers after compressing the cylinders with air?

Also, any ideas why only the intake valve retainers would be broken? None of the exhaust valve retainers were affected.

Last edited by Vio; 03-05-2010 at 11:24 PM.
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post #7 of 139 Old 03-05-2010, 11:52 PM
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Another trick I used on other engines while replacing valve stem seals is to push a couple feet of clothesline through the spark plug hole, then turn the crank shaft until the piston pushes up the clothesline against the valve face.

Less complicated if you don't have shop air.
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post #8 of 139 Old 03-06-2010, 12:03 AM
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Quote:
Originally Posted by Vio View Post
Any tricks to removing the retainers after compressing the cylinders with air?

Also, any ideas why only the intake valve retainers would be broken? None of the exhaust valve retainers were affected.
Get a valve spring compressor or do it the old school way. Get a deep socket and put a magnet in it. If the head was off the bike you put the socket with extension over the retainer and TAP with a hammer. When the spring compresses, the magnet will pull the keeper out and free up the retainer. Takes a little practice to figure out how much to Tap the socket but it works like a charm and a lot faster than a compressor. Since your using compressed air i would put some ass behind it and just push down so you don't have problems with the valve dropping in the cylinder. If it does its not a big deal . Just pull it back up with some needle nose. Put a rag over the oil passages(and spark plug holes ) so you don't drop a keeper(or pieces of retainer) down in the motor. Trust me, that sux. Good luck.
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post #9 of 139 Old 03-06-2010, 12:14 AM Thread Starter
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any ideas why only the intake valve retainers would be broken? None of the exhaust valve retainers were affected.

Interestingly, ALL of the intake (broken) valve clearances were in spec...
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post #10 of 139 Old 03-06-2010, 12:22 AM
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My GUESS would be the intake came has more lift than the exhaust so it has more stress on it. But its only a guess.
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