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Author Topic: Old green head .15 question  (Read 502 times)

Offline Robert W

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Old green head .15 question
« on: October 28, 2009, 06:26:07 AM »
I have an old K&B green head .15 that had a stuck piston that I wanted to disassemble and used the case for another that was in good shape, except for the rear mounting holes. I got the piston unstuck, but am not sure how to get the cylinder off. I had thought that the cylinder was held to the case by the two longer head bolts, but when comparing them outside of the cylinder they do not look long enough to go into the case. This could be an optical illusion and I want to make sure it is not held in by an overlooked method. I have put it back into the crock-pot for more soak time.

Thanks
Robert
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Offline Marvin Denny

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Re: Old green head .15 question
« Reply #1 on: October 28, 2009, 08:27:39 AM »
  You are correct.  The cylinder is held to the case by the two long head bolts (the front and rear ones).
   If you have those two screws out the only thing holding the cylinder to the case is the gasket.  Sometimes the gasket is really stuck hard and is almost impossible to get unstuck.
  That is especially true if someone (like me) has substituted a "playing card" gasket for the regular factory gasket.  Giving the engine the Crock pot treatment may help loosen the gasket or you may have to use an exacto knife and wedge the blade between the case and cylinder and then take a small hammer and drive the blade on in between the cylinder and case to force the two apart.  If you do this--- BE CAREFUL and not gouge the aluminum case.

  Bigiron
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Offline Robert W

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Re: Old green head .15 question
« Reply #2 on: October 28, 2009, 03:08:57 PM »
Thanks Bigiron

I tried your suggestion and got the cylinder off. I also fond the reason the the long screws looked short and caused my confusion. Both of the long screws were broken approximately 1/8" above the case. When taking them out it did not feel like they broke, only hard to get out due to the crude. Once apart, the inside did not look that bad and this one may actually run when cleaned:)

Now for the next quest What thread size screw should I get for a replacement.

Regards
Robert
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Offline Marvin Denny

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Re: Old green head .15 question
« Reply #3 on: October 28, 2009, 08:04:56 PM »
  I believe they are 4-40.

  Bigiron
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Offline john e. holliday

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Re: Old green head .15 question
« Reply #4 on: October 29, 2009, 07:39:18 AM »
If in doubt do as I do.  Take the case and sleve to your local Ace Hardware and try the socket head screws until you find the one that works.  I have a good supply of 4-40 and only go for the ones I do not have in stock.  Have fun, DOC Holliday
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