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General Category => General Discussion => Topic started by: Martindf on May 19, 2018, 09:44:38 PM

Title: Stuck piston and barrel
Post by: Martindf on May 19, 2018, 09:44:38 PM

What's my next move?
(https://thumb.ibb.co/mfEfAo/20180519_143959.jpg) (https://ibb.co/mfEfAo)

(https://thumb.ibb.co/j6Fnqo/20180519_145038.jpg) (https://ibb.co/j6Fnqo)

Title: Re: Stuck piston and barrel
Post by: Antietam Classic Cycle on May 19, 2018, 10:43:48 PM

Remove the engine sump, unbolt the connecting rod cap and remove the piston with cylinder and rod as a unit. The only reusable part is going to be the rod anyway, so do whatever is necessary to separate that from the rest.

Title: Re: Stuck piston and barrel
Post by: Dukedesmo on May 20, 2018, 05:00:00 AM

The above sounds like good advice.


I had a KTM 2-stroke that ingested the rollers from the little end bearing, they came up through the ports and got jammed into the cylinder/piston walls.


Had to remove the piston from the cylinder with a large hammer...

Title: Re: Stuck piston and barrel
Post by: Sasquatch Jim on May 20, 2018, 09:41:49 AM

 Remove the rod as described above.  Stand the cylinder up and pour water into it.
add a couple of heaping spoonfuls of Drano crystals.  (Sodium hydroxide)
 This will dissolve the aluminum and eventually you will be able to pound it out and remove the rings.
 You didn't want that piston anyway, and now you can overbore the cylinder and use it.

Title: Re: Stuck piston and barrel
Post by: nc43bsa on May 20, 2018, 10:50:17 AM

Chrome bore?

Title: Re: Stuck piston and barrel
Post by: Martindf on May 22, 2018, 05:04:07 AM

(https://thumb.ibb.co/kWgy1T/20180520_122826.jpg) (https://ibb.co/kWgy1T)

(https://thumb.ibb.co/fdHSvo/20180520_141536.jpg) (https://ibb.co/fdHSvo)

Title: Re: Stuck piston and barrel
Post by: Martindf on May 22, 2018, 05:06:44 AM

This bike Is a text book case of neglect.

Title: Re: Stuck piston and barrel
Post by: nc43bsa on May 22, 2018, 11:03:28 AM

Was it found in a creek?

Title: Re: Stuck piston and barrel
Post by: tris on May 22, 2018, 11:06:17 AM

Quote from: Martindf on May 19, 2018, 09:44:38 PM

What's my next move?
(https://thumb.ibb.co/mfEfAo/20180519_143959.jpg) (https://ibb.co/mfEfAo)

(https://thumb.ibb.co/j6Fnqo/20180519_145038.jpg) (https://ibb.co/j6Fnqo)

C-4

Title: Re: Stuck piston and barrel
Post by: Toecutter on May 22, 2018, 01:12:38 PM

A metric shit-ton of penetrating oil, a 2x4 and a sledgehammer.

Title: Re: Stuck piston and barrel
Post by: Don G on May 22, 2018, 02:14:19 PM

Don't even contemplate beating on the con rod, best to use an hydraulic press and push on the piston, place some thing like a piece of plate on top of the piston first to prevent pushing through the crown.  DonG

Title: Re: Stuck piston and barrel
Post by: Rebochi on May 22, 2018, 02:16:59 PM

  Heat and penetrating oil.

Title: Re: Stuck piston and barrel
Post by: nc43bsa on May 22, 2018, 04:32:45 PM

I had a similar situation with a BSA A-65 a few decades ago.  The pistons were stuck near the top of the cylinders, and being a BSA I couldn't remove the barrels from the crankcases or the rods from the crank.

I eventually drilled a bunch of holes in the pistons near the piston rings and broke the pistons into pieces.  I spared the rods and the cylinders, which needed a rebore, obviously.

As it turned out, the crank was in excellent condition.

Title: Re: Stuck piston and barrel
Post by: rodekyll on May 22, 2018, 05:21:57 PM

Am I the only one who is wondering why?

Title: Re: Stuck piston and barrel
Post by: John A on May 22, 2018, 06:13:47 PM

I don't think so ,David, with the amount of better junk going in the scrap pile, it makes me wonder

Title: Re: Stuck piston and barrel
Post by: rodekyll on May 22, 2018, 07:39:26 PM

I'm surrounded by good core engines that I can't sell.