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21-11-2011, 12:10
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#1
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Registered User
Join Date: Oct 2010
Location: Halifax, N.S Canada
Boat: Tanzer 26, Walk22
Posts: 930
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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????
__________________
Just the guy that runs the boat.
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21-11-2011, 12:36
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#2
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Registered User
Join Date: Mar 2003
Location: Philippines in the winters
Boat: It’s in French Polynesia now
Posts: 11,368
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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.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
The measure of a man is how he navigates to a proper shore in the midst of a storm!
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21-11-2011, 13:39
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#3
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Registered User
Join Date: Dec 2008
Location: Oriental, NC
Boat: Mainship Pilot 34
Posts: 1,461
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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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21-11-2011, 13:51
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#4
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Registered User
Join Date: Oct 2010
Location: Halifax, N.S Canada
Boat: Tanzer 26, Walk22
Posts: 930
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Re: Seized Piston
You guys are right I have to fix that exhaust elbow. Thanks for the tips..
__________________
Just the guy that runs the boat.
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21-11-2011, 13:59
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#5
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Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,483
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Re: Seized Piston
Quote:
Originally Posted by djmarchand
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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Lot of luck with that on most boats I've seen.... center cockpits maybe...
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard
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21-11-2011, 14:27
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#6
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Registered User
Join Date: Mar 2003
Location: Philippines in the winters
Boat: It’s in French Polynesia now
Posts: 11,368
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Re: Seized Piston
Quote:
Originally Posted by Cheechako
Lot of luck with that on most boats I've seen.... center cockpits maybe...
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Probably means 12" above wetlift.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
The measure of a man is how he navigates to a proper shore in the midst of a storm!
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21-11-2011, 14:44
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#7
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֍֎֍֎֍֎֍֎֍֎
Join Date: Apr 2006
Posts: 15,136
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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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21-11-2011, 14:46
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#8
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Registered User
Join Date: May 2009
Posts: 1,379
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Re: Seized Piston
Quote:
Originally Posted by hellosailor
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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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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Let your heart tell you where to go, but let your brain tell you how to get there.
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21-11-2011, 14:49
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#9
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Registered User
Join Date: Oct 2010
Location: Halifax, N.S Canada
Boat: Tanzer 26, Walk22
Posts: 930
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Re: Seized Piston
Quote:
Originally Posted by hellosailor
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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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.
__________________
Just the guy that runs the boat.
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21-11-2011, 14:50
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#10
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Registered User
Join Date: Nov 2010
Location: Quaker Hill, CT (just above the US Coast Guard Academy)
Boat: Silverton 34 Convertible
Posts: 200
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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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21-11-2011, 19:50
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#11
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Resin Head
Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,205
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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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21-11-2011, 21:23
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#12
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Registered User
Join Date: Dec 2010
Location: Vancouver Washington
Boat: Ed Monk designed 34' Sloop Second Wind
Posts: 400
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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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21-11-2011, 21:31
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#13
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Resin Head
Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,205
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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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21-11-2011, 21:58
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#14
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Registered User
Join Date: Nov 2006
Location: Back in Northern California working on the Ranch
Boat: Pearson 365 Sloop and 9' Fatty Knees.
Posts: 10,466
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Re: Seized Piston
Quote:
Originally Posted by hellosailor
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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I can vouch for (Aero)Kroil...amazing stuff!
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"
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21-11-2011, 22:53
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#15
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Registered User
Join Date: Apr 2008
Location: abbeville la
Boat: seawind II Patience
Posts: 541
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Re: Seized Piston
Since it is flammable I would caution re heating.marc
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