Re: engine milage and* mechnical status
In a message dated 5/27/08 11:43:38 AM,
writes:
> I dunno. I have a fairly low mileage car, the engine should have been in
> pretty good shape, but it never seemed to run correctly. I eventually pulled
> the top end to figure out what was going on:
>
>
It is certainly possible for an engine which has been sitting, to break a
ring, or stick a valve, but it is far more likely that these rings were stuck
solid before someone (presumably a previous owner) had tried to spin it loose
without lubricating or freeing the moving parts like rings or valves. These rings
may have broken from being forced to move while still rusted to the cylinder
walls, or stuck in the piston lans. The pistons appear to have been banged up
by the broken ring parts which were apparently being thrown about in the
combustion chamber.
I always try to free a long stored engine manually, and not on the starter
motor, or by running or dragging the car, and popping the clutch. If the engine
has a crank, that is the best way, but otherwise, with the plugs removed to
reduce compression and to allow you to listen or watch for problems, I simply
turn the fan while tensioning the belt with my other hand, or use a ratchet to
turn the crankshaft pulley. By using your hands, you can easily "feel" for any
obstruction or problems, before any damage is usually done.
I also lubricate all of the cylinders liberally before trying to turn the
engine at all, and once I am certain that it is free, and that all components are
traveling freely (usually by removing the valve cover and watching each and
every valve and lifter operating through its range of motion), I will then spin
the engine with plugs removed on the starter motor to be sure all is free,
and that the previously installed fresh oil is being distributed and lubricated
throughout the engine.
I do not believe in prophylactic engine rebuilds or disassembly, as it is
often not necessary, and often introduces new variables which can mask or
complicate your ability to properly diagnose the original problems and condition of
the engine.
I always say, get it running, and see what you got before you tear it apart.
Just my two cents,
Chas
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