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Broken intake valve spring


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#1 lyall ONLINE  

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Posted May 26, 2016 - 12:44 PM

I got a JD 214 that I am restoring. It was a rust bucket.

Got the rust and paint removed and repaint.

I started working on the K321 hp 14 motor.  Took the head off the the intake valve was stuck up.  Tapped it lightly and it was free.  Clean the outside of the motor, then removed the breather and look at the springs.

The exhaust looked okay, but the intake spring is broken into several pieces.

 

What would cause the the spring to break into several pieces?

 

I have worked on several Kohler motor and this is a first for me.

I have not removed the intake valve at this time, so I do not know the condition of the valve.

but it does move freely.  the valve looks like it like it does sets okay, so I think the valve is not bent.

 

Thanks for your ideas and input.


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#2 boyscout862 ONLINE  

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Posted May 26, 2016 - 12:47 PM

Sometimes springs aren't heat treated right and become brittle. While you have it this far apart, decarbon the combustion chamber and lap the valves. Use Marvel Mystery Oil in your gas. Good Luck, Rick
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#3 lyall ONLINE  

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Posted May 26, 2016 - 06:22 PM

that is what I was planning to do.

got the valve out and checked them over and they seen good with the specs.  The reason the intake was stuck because it had some rust holding it,

There was very little carbon build up it the motor.  So it will get a good cleaning and valves lapped.

 

Oh the spring was broken into 4 pieces.

The cylinder looks good and check the ring gap in the cylinder at 3 different spots and 3 different angles (0, 120, and 240 degrees ) the ring gap was around 0.035, and I got a new set of rings to go in it. A good hone job for the cylinder and recheck the motor again to make sure all is good to go.



#4 Tecumseh power OFFLINE  

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Posted May 26, 2016 - 10:33 PM

Spring failures can be caused by over speed and poor steel. And rust pits on the spring
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