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Frozen Pistons?
- boxershorts
- Posts: 15
- Joined: Wed Jul 20, 2011 9:15 pm
Frozen Pistons?
Any ideas as to what to do next would be appreciated.
Thanks, John
- schrader7032
- Posts: 9057
- Joined: Fri Oct 27, 2006 3:00 am
- Location: San Antonio, TX
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So, it should likes the
At what position are the pistons stuck? If they're all the way down, then there's a better chance that rust may have attacked the cylinder walls. If the pistons are up, that can help protect the walls from direct moisture.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- boxershorts
- Posts: 15
- Joined: Wed Jul 20, 2011 9:15 pm
Hi Kurt, Thanks for the
Thanks for the reply. You certainly are an an asset to the posters here seeing all the responses by you I have seen including my post a few weeks ago, thank you. I will try the penetrant in the spark plug holes. I assume by ATF you mean transmission fluid. The last post I read on this subject said Acetone and ATF?
Assuming this frees things up, do I need to remove the cylinder heads and cylinders to remove the excess penetrant and polish the walls with something like #0000 steel wool? In other words, what are the steps after the penetrant and if this doesn't work can I remove the cylinder heads and tap the pistons with a wood block? How about piston rings?
Thanks, John
- schrader7032
- Posts: 9057
- Joined: Fri Oct 27, 2006 3:00 am
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Thanks, and ooops..right,
If the pistons are stuck and you end up getting them freed, I would certainly thing you're in for a complete teardown. I would imagine that crank bearings, etc., will need some attention. After the top end is off, you should examine the cylinder walls for possible damage. Clean them up with soapy water and get some light on them. They might be good with just a honing. But you'll also need to measure the bore dimension as well as the ovality to see what you have to do on the rebuild, either go with stock, first over, etc.
If the pistons are stuck, then I think things begin to approach the destructive stage. If the pistons are near bottom dead center, you could remove each cylinder and with help, rotate the crank so that each cylinder/head moves away from the case, exposing a small portion of the connecting rod. As a last resort, you may be forced to cut the connecting rod so that you can remove the cylinder/head and really begin to work on the stuck piston. The cylinder/head is more valuable than the connection rod. Once free you can being working on the stuck piston from the back side.
Have you tried removing the head? If you can get the head off, then you can more effectively work on the top of the piston. You could try some heat or maybe even some dry ice in the top of the piston to shrink it and get it to free up.
I would continue with the penetrant and wait this out...only go to the last resort when that's the final straw. Work at this from the least destructive techniques to the most destructive...hopefully somewhere along the way, it will let go.
Maybe some others have some ideas you could try.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- TrophyMoto
- Posts: 78
- Joined: Sun Mar 29, 2009 9:41 am
I made this to get stuck
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- boxershorts
- Posts: 15
- Joined: Wed Jul 20, 2011 9:15 pm
Piston loosening device
Thanks
- TrophyMoto
- Posts: 78
- Joined: Sun Mar 29, 2009 9:41 am
Screw it (with heat!!) to
I should also add I have fitted it with a "foot" on the piston end, so as to not tear up the piston too bad.
- Dave Reina
- Posts: 106
- Joined: Sun Nov 21, 2010 11:23 am
Frozen Pistons
I would get some penetrant into the cylinders, Put an air hose nozzle in the spark plug hole with a rag around the nozzle and blow lots of penetrant around so that it gets pushed all around the joint where the cylinder and top ring meets. Maybe do this several times over a day. Then I would put the bike in 2nd or 3rd gear and gently rock it back and forth. This usually works if things are not totally nasty.
Once free you can decide if you want to try it without removing the cylinders.
Dave Reina
Brooklyn, NY
- boxershorts
- Posts: 15
- Joined: Wed Jul 20, 2011 9:15 pm
Unstuck!
JT
- wa1nca
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I also made a similar puller
I tried soaking the jug and heating it several times with no luck
The best thing about this is that you can't damage the rod bearings or crankshaft by pulling the jug from the piston
I have also heard that if you make a adaptor to fit into the spark plug and that is fitted with a standard grease fitting ( valve must be closed )
You then can fill the jug up with grease and it will come off again without any damage to the rod bearing or crankshaft
I don't like of putting the bike in gear and rocking it because it could damage the rod bearing or crankshaft
Tommy
54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA