First thing, if the engine has not worked for a long time and is frozen,
there is a great probabily for the rings to be stuck in the pistons and you
will have to remove them to free the rings (or perhaps replace them). If the
oil was bad, there are also some risks that some oil path are obstructed.
So, I think that a good resolution is to disassemble the engine to verify
all parts. If you are lucky, you will just have to buy a gasket set.
The first thing I did was to remove the cylinders heads to verify the state
of the cylinders upon the pistons because some water may have enter (spark
plugs removed for example) and rust can oppose some pistons to go up.
The second thing was to remove the crankcase to see the state of the
cylinders below the pistons. Rust can also oppose some pistons to go down if
water came in the oil (condensation or other depending on the storage
conditions). It was my case.
To free the engine, I decided to remove the crankshaft to remove the pistons
one by one. So, I first removed the connecting rods which were easy to
access ( pistons in lower position). Once one piston was freed, I put it
upward on knocking with a piece of wood and a hammer on the connecting rod
(take care to the bearing). I also had to modify tools to access some
connecting rod nuts which were in position difficult to access. After that,
I managed to free 5 pistons and make the crankshaft to turn enough to make
the last connecting rods accessible. The crankshaft and all the pistons can
then be removed from the block.
After that, I just had to hone the cylinders with the adapted tool and
replaced the rings with new parts ( they were almost stuck and I broke most
of them while removing).
If the rust is too important, you will have to resize the cylinders.
Good luck.
Raphael
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