Re: JPOR: Piston removal

[Brett Davis <bdavis@xxxxxxxxxxxxx>]

"Paul W." wrote:

> ****************Please Remember to snip your replies***************
> Obi-Wan <bvh@inetnebr.com> wrote:
> > You guys will get sick of me before I'm done with this project...
>
> Not yet... this is a refreshing "new" topic.  We don't cover engine internals
> very often.  <G>
>
> > Once I've got the crankshaft removed from my 401 V8, is there any
> > reason why I can't remove the pistons from the bottom to check/replace
> > the rings?  The TSM says I have to remove them through the top, but
> > that assumes the crank is in place.
>
> Besides the possibility of journal interferance, most auto engines won't allow
> pistons to come out the bottom since the fit at the bottom of the bore is very
> tight since the piston never goes that far down.
>
> > When removing through the top, the TSM says I need to ream out a
> > little ridge that's along the top of the cylinder bore before the
> > pistons will slide out.  What exactly is the "ridge reamer" they
> > talk about, and can I just do the same job with a Dremmel tool?
>
> Your local rental shop should have one.  I'd highly recommend it because it
> keeps the top of the cylider bore round.  Next to impossible to do with a
> Dremel tool/die grinder.
>
> > The TSM says to use a ring expander to install the compression rings
> > on the pistons.  What is this, and is it really necessary?
>
> As the others said... life will be much easier with one.
>
> > Similarly, it says to use a ring compressor to install the newly-ringed
> > pistons back into the cylinders.  What is this, and is it really
> > necessary?  Is it still necessary when installing pistons from the
> > bottom of the cylinder (see question #1)?
>
> See above.
>
> Paul
>
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--
Brett Davis