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Author Topic: New steam engine/boiler - advice wanted  (Read 546 times)

Mi Steam

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Re: New steam engine/boiler - advice wanted
« Reply #15 on: September 25, 2019, 01:53:42 am »
I started using Never-Seez when I work on the boilers at
school and I still use it. The gaskets never stick no matter
how long they on the boiler or traps.

https://neverseizeproducts.com/never-seez-nsb-4-regular-grade-lubricant-anti-seize-4-oz/
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Carl "There is a better way for everything. Find it."TAE

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komet163b

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Re: New steam engine/boiler - advice wanted
« Reply #16 on: October 03, 2019, 02:54:50 pm »
Well, here we go again.
Why can't things be simple and work as they should...

Well, it is sort of ok.  I sealed up the valve chest with
the same sealer your grandpa would have used,
Indian Head Gasket Shellac.  I even spoke with
a tech rep and he thought it was a good idea.  I've
added before/after photos.

I hooked it up to my usual air source and it just
would not go.  I then took it out to my garage
compressor and it took off - but at a much higher
pressure(?) than need be.  There are no leaks and
it turns over reasonably well by hand, so I think it
might have to do with the valve and ports.  They
looked a bit hinky to me and I was sorely tempted
to do a bit of grinding work to make them right
but thought I should give it a chance as it was. So... 
IT DOES (slowly) RUN!

Where do I go from here?
Wayne

 
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Scorpion2nz

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Re: New steam engine/boiler - advice wanted
« Reply #17 on: October 04, 2019, 12:24:37 am »
Personally i think it is a design fault .
The valve should float but i think the biggest issue is the ports in the cylinder block .
No amount of work by you will fix it properly.
I think the two, inlet ports are to far from centre..
Take the non floating valve off the spindle
Place it in place on the ports when it is moved the same distance as  the eccentric will move  it 
One port should be exposed and at the same time the recces in valve should cover center port and the other  port.
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komet163b

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Re: New steam engine/boiler - advice wanted
« Reply #18 on: October 07, 2019, 05:56:28 pm »
  Well, now I've gone and done it.
The rod going into the shoe would
not budge when I fiddled with it but
it apparently loosened after some
running on air.  I was checking the
timing, had the eccentric-rod off
and noticed the shoe-rod was loose.
The next thing I knew it was in my hand
and my BP went up.  I now could see
threads on the rod and tried to get it
back into the shoe, but, so far no luck.
I may have to reopen the valve chest.
If I do I may clean up the ports if it makes
sense.  Sometimes you are forced to take
a step back to get ahead.

More grist for the mill,
Wayne
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Scorpion2nz

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Re: New steam engine/boiler - advice wanted
« Reply #19 on: October 07, 2019, 09:09:07 pm »
Right I want you to measure the amount of movement in the eccentric from end to end .
Then remove the steam chest.
I then want you to make a card board template exactly the same as the port block/shoe
ie a square with the center square cut out.
Then place the cardboard template on the block in exactly the center over the ports
You should only see the center port .
Move cardboard to right  exactly half of your eccentric throw measurement.
Take photo then move it to the  left  your total eccentric throw  take another photo
Show us the results .
“ do not fiddle with the port slots yet “
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komet163b

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Re: New steam engine/boiler - advice wanted
« Reply #20 on: October 08, 2019, 07:33:13 am »
Aye, Aye.  I already drew a diagram to scale and
made a paper pressing of he ports.  Now that the shoe
is loose we can review the port/shoe arrangement to
determine if any adjustments to the ports or shoe are
needed.  Photos and specs soon.

More pressing....the rod that drives the shoe is steel
and must have been left wet for an eternity leading to
corrosion of the threads that held the keeper-nut.
The keeper nut is a ground down nut, so that is BS too.
It all still works but I think the lifetime for running is
low.  I am making plans for a possible replacement

P.S.  The eccentric throw is 1/8".  Paltry if you ask me

Thanks for the advice and the time you took to give it,
Wayne
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