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Old 21-11-2011, 13:10   #1
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Seized Piston

O.k so after a long summer of neglect, my newly rebuilt MD2 has a seized piston. Somehow water got down the back cylinder and has sat there for a while. I put some penetrating fluid down it and used a pry bar on the front, nothing. Today I took the head off so the top of the piston is exposed, i cleaned everything up and filled the top of the cylinder up with some diesel. I will leave it sit overnight and try again in the morning.
Any other suggestions or maybe I'm forgetting something????
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Old 21-11-2011, 13:36   #2
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Re: Seized Piston

Just remember to rotate the piston downward first. If you can get someone to tap on top of the piston with a block of wood and hammer while you crank the shaft, it helps to brake it loose. But not too much! Try a little at first then let it soak a bit more and try again the next day.

You need to deal with your exhaust elbow. Re: waterline. Water is draining backwards in your system after shutdown. A common problem that doesn't present itself until it's too late.
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Old 21-11-2011, 14:39   #3
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Re: Seized Piston

Go to boatdiesel.com and read Tony Athens' article on marine exhaust systems. He recommends that the bottom of the exhaust elbow be 12" above the water line. Lots of good advice in that article.

David
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Old 21-11-2011, 14:51   #4
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Re: Seized Piston

You guys are right I have to fix that exhaust elbow. Thanks for the tips..
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Old 21-11-2011, 14:59   #5
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Re: Seized Piston

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Originally Posted by djmarchand View Post
Go to boatdiesel.com and read Tony Athens' article on marine exhaust systems. He recommends that the bottom of the exhaust elbow be 12" above the water line. Lots of good advice in that article.

David
Lot of luck with that on most boats I've seen.... center cockpits maybe...
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Old 21-11-2011, 15:27   #6
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Re: Seized Piston

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Lot of luck with that on most boats I've seen.... center cockpits maybe...
Probably means 12" above wetlift.
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Old 21-11-2011, 15:44   #7
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Re: Seized Piston

If the diesel doesn't unstuck it, I'd suggest cleaning off the diesel and soaking it with some PBlaster (sold in stores) or Kroil (mail order only). Those two chemically attack the rust bond and break it down, plain diesel or WD40 isn't going to do the same thing.
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Old 21-11-2011, 15:46   #8
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Re: Seized Piston

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Originally Posted by hellosailor View Post
If the diesel doesn't unstuck it, I'd suggest cleaning off the diesel and soaking it with some PBlaster (sold in stores) or Kroil (mail order only). Those two chemically attack the rust bond and break it down, plain diesel or WD40 isn't going to do the same thing.
Just be careful to keep the PBlaster off of any of the seals. It will eat them along with the rust.
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Old 21-11-2011, 15:49   #9
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Re: Seized Piston

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Originally Posted by hellosailor View Post
If the diesel doesn't unstuck it, I'd suggest cleaning off the diesel and soaking it with some PBlaster (sold in stores) or Kroil (mail order only). Those two chemically attack the rust bond and break it down, plain diesel or WD40 isn't going to do the same thing.
When I head back out in the morn i will try to pick up some PBlaster, I didn't want to row in and out all I had was the deisel. I have never heard of PBlaster but you are the second to recomend it so I will give it a try.
Thanks.
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Old 21-11-2011, 15:50   #10
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Re: Seized Piston

...and be PATIENT. Don't force it. It'll come free with a good soaking......LL
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Old 21-11-2011, 20:50   #11
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Re: Seized Piston

Aerokroil. The oil that kreeps. I love this stuff, wouldn't go anywhere without it.
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Old 21-11-2011, 22:23   #12
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Re: Seized Piston

I am a huge Kroil fan too. I like the liquid better than the aerosol.

Penetrating-Lubricating Oils

I would soak all the bores with Kroil for a couple of days. Then gently rap on the pistons with a block of wood and a BFH.

Brad
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Old 21-11-2011, 22:31   #13
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Re: Seized Piston

And maybe some heat as well. Heat around the piston, not the piston itself...
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Old 21-11-2011, 22:58   #14
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Re: Seized Piston

Quote:
Originally Posted by hellosailor View Post
If the diesel doesn't unstuck it, I'd suggest cleaning off the diesel and soaking it with some PBlaster (sold in stores) or Kroil (mail order only). Those two chemically attack the rust bond and break it down, plain diesel or WD40 isn't going to do the same thing.

I can vouch for (Aero)Kroil...amazing stuff!
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Old 21-11-2011, 23:53   #15
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Re: Seized Piston

Since it is flammable I would caution re heating.marc
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