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-   -   when storing an engine, unused, please... (https://www.sailnet.com/forums/diesel/331642-when-storing-engine-unused-please.html)

Rockter 10-16-2019 09:51 AM

when storing an engine, unused, please...
 
When you are storing an engine, unused, please take the precaution of turning it a little say once a month or so, or if you cannot, then run some lubricant on to the top of the pistons (via the inlet valve, or pull the injectors to do it).
If you don't, the motor is likely to corrode internally and will be very difficult to move, if ever.
I speak from recent experience - a guy on the same dock said he had a Volvo MD17D (mine is the MD 17C) and that it only had 2000 hours on it (it does).
He had stored it in his garage for about 7 years, and i made him an offer for it.
I got it home, but it will not turn. There is a slight movement of the flywheel, but now some 2 weeks later, it still had that slight movement and it is not improving.
I have tried flooding it with various releasing agents via the injector ports, but it is not responding to a breaker bar (or other persuasion).
Things do not look good, and to have to break it is a pity as there is very little wrong with it otherwise.

And all for want of just the occasional rotation of the crank!

Minnewaska 10-18-2019 06:14 AM

Re: when storing an engine, unused, please...
 
How was the engine pickled when it was put away? Cylinders should be treated with fogging oil, at a min. There are pickling oils that promise to stay adhered longer, which require pulling the injectors at storage. Too many don't do it.

Good advice to move it occasionally, but that alone isn't going to prevent corrosion. Perhaps it will prevent the seize you're experiencing. It needs to be lubricated. Keeping the motor well above the dew point, or better yet, in a dry environment helps too.

The cheap hack to free a stored seized cylinder is to top the cylinder with diesel fuel and let it sit for a day and work it's way past the rings. Once free, you'll be flushing the crankcase, of course.

Rockter 10-18-2019 08:22 AM

Re: when storing an engine, unused, please...
 
Minn :
I have tried every concoction I can think of or has been recommended for about two weeks.
WD40.
50/50 mix of ATF and acetone.
ACF50.

Still the flywheel barely moves - just the slightest "clunk", and moving about 1/2 a tooth and it's a big flywheel on the MD17D.
I am not optimistic.
The worst that happens is that I break it for spare parts. It is a mine of spares and should keep my own motor - a C model - going for a while yet.
In a week or two we will pull the heads and try a bit more force, and perhaps a bit of heat.
Failing that we will have to drop the sump, disconnect the big ends and take the barrels to a hydraulic press. That will shift the pistons or nothing will.

Rockter.

Minnewaska 10-18-2019 01:23 PM

Re: when storing an engine, unused, please...
 
Pull the head and have a look maybe? Sounds like it wasn’t properly pickled, so may be trash.

Rockter 10-18-2019 02:33 PM

Re: when storing an engine, unused, please...
 
It was never pickled.
If i can get the pistons to move, I can at least get it running, then store it for bits.
If it doesn't run, I will break it and store the bits in a diesel bath, or something.
I cannot go too far wrong, really.
Parts for these older motors are rare, often already worn, and very expensive indeed.

Capt Len 10-18-2019 10:39 PM

Re: when storing an engine, unused, please...
 
Not familiar with that particular engine but can you remove timing gear/chain. with less parts in the game, a breaker bar over bolts in the flywheel/ ,Goodly whacks with wood club or 4x4 Forth and back. If it's rings but moving a bit. all may be well yet.

RichH 10-21-2019 09:19 AM

Re: when storing an engine, unused, please...
 
[QUOTE=......................
Things do not look good, and to have to break it is a pity as there is very little wrong with it otherwise.

And all for want of just the occasional rotation of the crank![/QUOTE]

All is NOT lost. The prime caution is: DO NOT ***FORCE*** the crankshaft or you will risk breaking your piston rings. Suggestion: 'soak' the cylinders with a table spoon of "Marvel Mystery Oil" or other 'penetrating oil', in each cylinder every few day and GENTLY Rock the crankshaft (nose bolt) back and forth with a socket on a long breaker bar .... it may take some time (days or weeeks) to break loose so dont lose patience. DO NOT Force, DO NOT USE the STARTER until the engine is FREE to spin.

Once loose and relatively easy to turn ... by HAND, start engine AT NO LOAD speed, change oil with a mix of oil ansd 1/4 Marvel Mystery Oil ..... let idle (NO LOAD) while increasing rpm over several HOURS in order to repolish the cylinder walls, piston ring grooves etc. PATIENCE - do nnot rush and do not FORCE.

Chas H 10-21-2019 06:16 PM

Re: when storing an engine, unused, please...
 
If/when you get your engine to turn over, crank the engine to build up oil pressure without compression in the cylinders (injectors removed) before attempting to start it. Better for all bearing surfaces.

Rockter 10-27-2019 03:56 AM

Re: when storing an engine, unused, please...
 
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.

Minnewaska 10-27-2019 07:50 AM

Re: when storing an engine, unused, please...
 
Are the cylinders sleeved? If one had to hydraulically press the pistons out, the walls must be toast. Not sure I'd bother.

However, if you pull the head off, you can more easily keep a covering of penetrating fluid on the pistons.


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