when storing an engine, unused, please... - Page 2 - SailNet Community
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post #11 of 17 Old 10-27-2019 Thread Starter
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Re: when storing an engine, unused, please...

Minn...
It's a mine of spare parts.
Even a cylinder jacket changes hands for (like) £250.
I have flooded it via the injector ports with copious quantities of releasing fluid.
The piston tops are well-wetted already.

Rockter.
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post #12 of 17 Old 10-27-2019
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Re: when storing an engine, unused, please...

If you're willing to presumably trash the cylinder and piston, get all the current goo out and bath in white vinegar. The longer you leave it, the more rust/material will be eaten away. Diluting the vinegar with 50% water works fine too, just takes longer. Could keep it from getting carried away.


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post #13 of 17 Old 10-28-2019
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Re: when storing an engine, unused, please...

Quote:
Originally Posted by Rockter View Post
Chas...
It's just not moving, now some 2 weeks on.
Looks very much like the heads have to come off and I will try persuasion on the top of the pistons.
Failing that, I will drop the sump, disconnect the con-rods, lift the barrels with the pistons and take them to a hydraulic press.

Rockter.
If the pistons are as stuck as you say the engine will have to come apart to repair it correctly. The rings may be frozen in their grooves. Even if you get the crank to turn and pistons to move the rings may be stuck and gunked up too much to move in their grooves as needed.

Remove the rod caps. (Keep them in order) They need to be replaced on the same rod and in the same direction. You could mark each one with a center punch or awl to identify their position and direction.

If each cylinder sleeve and piston can come out as a frozen unit that's even better.
If not remove the crankshaft doing the same thing with the main caps as they are removed.

Using a hardwood block (end grain) and a hammer tap on the top of each piston to attempt to move the piston down the cylinder. You may break rings and/or pistons while trying this. Pound only above the piston boss above the holes the piston pin goes through. If you are going this far the rings should be replaced.

If you want to use a press then make a disc a bit smaller that the piston dia. to put in the cylinder on the piston head to spread pressure across the head.
-CH
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post #14 of 17 Old 10-28-2019 Thread Starter
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Re: when storing an engine, unused, please...

Chas :

Thanks.
Soon we will give it a try.
I must say i am surprised. 7 years in a garage and it locks up like that???
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post #15 of 17 Old 10-28-2019
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Re: when storing an engine, unused, please...

I have had some luck after removing the head by filling the cylinders with diesel and leaving the breaker bar under tension from a 2 ton bottle jack, adding just a touch more tension each day if it doesn't seem to be over stressing. It may still take weeks, but the constant pressure, like a prop puller may just do the trick.
Good luck

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post #16 of 17 Old 10-29-2019
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Re: when storing an engine, unused, please...

Is it possible that something other than stuck pistons are cause of the crank not turning? The valve train? Or anything driven by the crank?
-CH
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post #17 of 17 Old 11-01-2019 Thread Starter
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Re: when storing an engine, unused, please...

Chas :
Difficult to tell.
I think I will have to pull the heads.
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