HELP! LE American eccentric straps

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DianneB
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HELP! LE American eccentric straps

Post by DianneB » Sat Jul 13, 2013 8:18 am

I am working on a L.E. American (new to me) with timing issues and while trying to set the timing I discovered the eccentrics were on the opposite sides from the way it was built (they are marked L and R).

I have a catalogue picture showing the straight rods on the outside and the offset rods are on the inside but the picture doesn't show whether the straight rod is pinned to the top of the Stephenson link on both sides (which I would assume) or not. Being as the rods were mixed up, I don't want to assume anything!

Can anyone confirm straight rods pinned to the top on both sides?

Thanks

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David Powell
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Re: HELP! LE American eccentric straps

Post by David Powell » Sat Jul 13, 2013 8:35 am

This gets deeper. Stephensons valve gear can have open or crossed rods. With open rods lead will increase as you notch up, with crossed rods it will decrease.Wish I were nearer I would offer to come over and take a look.Does your model run forwards with the reverser forward? Are the eccentrics keyed or set screwed? Perhaps someone with experience of the same model can help. Hope this helps a bit Regards David Powell.

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DianneB
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Re: HELP! LE American eccentric straps

Post by DianneB » Sat Jul 13, 2013 11:09 am

David Powell wrote:This gets deeper. Stephensons valve gear can have open or crossed rods. With open rods lead will increase as you notch up, with crossed rods it will decrease.
Open rods
Does your model run forwards with the reverser forward?
Yes
Are the eccentrics keyed or set screwed?
Setscrews, 2 per eccentric - one eccentric was loose originally.

I am the one who reversed the eccentric rods (left/right) when I had it rolled over to tighten up the wear in the eccentric straps and found the oil holes on the bottom a few weeks ago. I figured someone had put them back on the wrong sides so I swapped them side-to side which put the oil holes on the top.

After sorting out a few other problems I was crawling underneath today to set the timing again and with the trouble light just the right way, I saw that there was a faint marking - they were marked L and R! The markings were originally on the top, which is why I didn't see them but now the marks were on the bottom so I put them back the way they were originally (with the oil holes on the bottom) - it must have been built that way.

I have taken a guess reassembled it with the straight (outside) eccentric rod to the top and the offset rod to the bottom and set the timing. Hope I am right!

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ken572
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Re: HELP! LE American eccentric straps

Post by ken572 » Sat Jul 13, 2013 11:52 am

One must remember.
The best learning experiences come
from working with the older Masters.
Ken.

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DianneB
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Re: HELP! LE American eccentric straps

Post by DianneB » Sat Jul 13, 2013 2:34 pm

Afraid not Ken. I know all the parts of the valve gear but I DON'T know how Little Engines arranged them on the American.

I made a guess that the outside rods are the straight ones and go to the top of the link. Pretty sure that's the way it should be since the link and the outside eccentric seem to line up but confirmation is always good.

It timed out well. Steam test next.

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Kevin_S
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Re: HELP! LE American eccentric straps

Post by Kevin_S » Sat Jul 13, 2013 4:57 pm

Dianne, the rods that go to the top of the regulate reverse while the bottom regulate forward. Do you by chance have any plans for your American? They are valuable in helping setting up the timing of the engine, as they will get you set up at a starting point.
-Kevin S.

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Fred_V
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Re: HELP! LE American eccentric straps

Post by Fred_V » Sat Jul 13, 2013 5:25 pm

I am confused about open and closed rods. They are open at one dead center and crossed at the other dead center. What do you mean by this?
Fred V
Pensacola, Fl.

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Fred_V
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Re: HELP! LE American eccentric straps

Post by Fred_V » Sat Jul 13, 2013 5:28 pm

Kevin_S wrote:Dianne, the rods that go to the top of the regulate reverse while the bottom regulate forward. Do you by chance have any plans for your American? They are valuable in helping setting up the timing of the engine, as they will get you set up at a starting point.
-Kevin S.
On my Chloe the exp. link is lowered for fwd. gear that makes the upper rod the active one.
Fred V
Pensacola, Fl.

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DianneB
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Re: HELP! LE American eccentric straps

Post by DianneB » Sat Jul 13, 2013 7:20 pm

Fred_V wrote:On my Chloe the exp. link is lowered for fwd. gear that makes the upper rod the active one.
Same on the American

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gwrdriver
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Re: HELP! LE American eccentric straps

Post by gwrdriver » Sat Jul 13, 2013 8:55 pm

My LE American cylinders and related bits are dismantled at the moment (and likely to stay that way for a while) but IIRC the offset arms are on the inside.
GWRdriver
Nashville TN

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DianneB
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Re: HELP! LE American eccentric straps

Post by DianneB » Sat Jul 13, 2013 9:04 pm

Thank you gwdriver - I figured that's the way they had to go. :mrgreen:

c.p.huntington
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Re: HELP! LE American eccentric straps

Post by c.p.huntington » Sun Jul 14, 2013 2:35 am

Dianne:

The C.P. Huntington I'm constructing has the same valve gear as the your Little Engines
American. I checked my engine and found that the straight rods are on the outside and
connect with the bottom of the link, the rods with the offset are on the inside and connect
with the bottom of the link.

Jeff

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