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Old 03-25-2012, 07:24 PM   #1
matteo OP
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Stuck Piston - help

I have a R51/3 engine that I am tearing apart. The engine is the same as the /2 engines. One of the pistons is stuck in the cylinder. The engine does not turn over. I got one of the cylinders off, but the other has the piston completely stuck.

I can unbolt the cylinder from the case and turn the crank, but again the piston will not move within the cylinder.

I tried soaking it with some penetrating oil for a couple of hours. I also applied heat to the cylinder (got it to the point it was too hot to touch), but absolutely no luck. I tapped the cylinder lightly with a mallet to see if I can get it to break loose, but it did not work.

Any suggestions?
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Old 03-25-2012, 07:49 PM   #2
Hedge36
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I know a guy who freed one like that by bolting the head on, pouring a half cup of penetrating oil down the plug hole, then chucking an air line to the plug hole and letting it sit with about 25 psi on it. The next morning he heard a muted "pffft" as the loosened piston made its way down the bore.

There may be better ways, but it was effective and safe.
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Old 03-25-2012, 07:54 PM   #3
elite-less
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I used this simple tool to remove the stuck piston on my r75. I tapped the metal bar for a threaded rod and bolted it to the head. Double nutted the threaded rod and wrenched away. Popped the piston free in a few moments.

Not sure how the head is on a /3... but you might glean an idea from this.

IMG_3854
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elite-less screwed with this post 03-25-2012 at 08:02 PM
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Old 03-25-2012, 08:33 PM   #4
knary
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Quote:
Originally Posted by elite-less View Post
I used this simple tool to remove the stuck piston on my r75. I tapped the metal bar for a threaded rod and bolted it to the head. Double nutted the threaded rod and wrenched away. Popped the piston free in a few moments.

Not sure how the head is on a /3... but you might glean an idea from this.

IMG_3854
That cylinder is the prettiest shade of rust.
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Old 03-25-2012, 09:01 PM   #5
fishkens
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That cylinder is the prettiest shade of rust.


I hear it never sleeps.
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Old 03-26-2012, 08:14 AM   #6
mykill
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My buddy has used Coca cola successfully in stuck Hondas. You need to be more patient than a couple hours. I like the sound of the penetrating oil and compressed air trick.
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Old 03-26-2012, 08:18 PM   #7
matteo OP
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Quote:
Originally Posted by elite-less View Post
I used this simple tool to remove the stuck piston on my r75. I tapped the metal bar for a threaded rod and bolted it to the head. Double nutted the threaded rod and wrenched away. Popped the piston free in a few moments.

Not sure how the head is on a /3... but you might glean an idea from this.

IMG_3854
Thanks. I'll try a similar setup.
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Old 03-26-2012, 08:58 PM   #8
knary
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Quote:
Originally Posted by fishkens View Post


I hear it never sleeps.
Like my hunger for doughnuts.
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