Position of eccentric crank?
#1
I'm having a problem with a LifeLike 0-6-0 switcher.  It will run ok in forward but when I go to reverse the eccentric arm moves out of position and locks up the engine.  I'm suspecting that possibly the eccentric crank is out of position.  On both sides of the engine the eccentric cranks are offset from the centerline of the axle.  The one that keeps locking up appears to be very slightly more offset from the centerline that the other one.  Where should the eccentric crank be positioned in relation to the centerline of the axle?  I've looked at images from the internet til my eyes are blurry and can't really tell for sure.  Some appear to be aligned with the centerline of the axle others not so much.  I always bring the engine to a stop before reversing direction.

Any information, suggestions, and/or guidance will be greatly appreciated.

Tom
Life is simple - Eat, Drink, Play with trains

Occupation: Professional Old Guy (The government pays me to be old.)
Reply
#2
(03-24-2020, 01:27 PM)FiatFan Wrote: I'm having a problem with a LifeLike 0-6-0 switcher.  It will run ok in forward but when I go to reverse the eccentric arm moves out of position and locks up the engine.  I'm suspecting that possibly the eccentric crank is out of position.  On both sides of the engine the eccentric cranks are offset from the centerline of the axle.  The one that keeps locking up appears to be very slightly more offset from the centerline that the other one.  Where should the eccentric crank be positioned in relation to the centerline of the axle?  I've looked at images from the internet til my eyes are blurry and can't really tell for sure.  Some appear to be aligned with the centerline of the axle others not so much.  I always bring the engine to a stop before reversing direction.

Any information, suggestions, and/or guidance will be greatly appreciated.

Tom

Well Tom, for what I know, the closer you position the "free" end to the center, the less movement there is. In the few I have adjusted I go for the least movement to save wear and tear on the rods. (If we are thinking of the same thing)
Charlie
Reply
#3
For clarity the arrow point to the rod I'm talking about.



Tom


Attached Files Image(s)
   
Life is simple - Eat, Drink, Play with trains

Occupation: Professional Old Guy (The government pays me to be old.)
Reply
#4
(03-24-2020, 02:13 PM)FiatFan Wrote: For clarity the arrow point to the rod I'm talking about.



Tom

Yep we are talking the same thing. I would turn that counter clockwise about 15 degrees, and same on other side.I don't think it is real critical as it would be with a prototype. 
Charlie
Reply
#5
Thanks, Charlie. I'm assuming you mean toward the centerline?

Tom
Life is simple - Eat, Drink, Play with trains

Occupation: Professional Old Guy (The government pays me to be old.)
Reply
#6
That crank looks awfully far off center. It has to be a bit off center to work (meaning of eccentric). I would try to get it over the disc around the axle.

The actual amount is probably based on how much the valve moves in the cylinder and the geometry of the rods connecting them. Which side of the axle depends on whether the valve is inside- or outside-admission. (sorry, I don't know; might be able to look up). I think that both cranks should lead or trail the mounting pin.
David
Moderato ma non troppo
Perth & Exeter Railway Company
Esquesing & Chinguacousy Radial Railway
In model railroading, there are between six and two hundred ways of performing a given task.
Most modellers can get two of them to work.
Reply
#7
Charlie and David - thank you for your help. I'll make the adjustments after the plumber leaves. Not my best day yesterday.

Tom
Life is simple - Eat, Drink, Play with trains

Occupation: Professional Old Guy (The government pays me to be old.)
Reply
#8
I looked at my Model Railroader Cyclopedia today. The pivot point varies a bit, but the edge of the axle looks common.
They had pics and plans of an 0-6-0 somewhat like yours and they were different on which side of the axle the crank went on. If you put it on the wrong side, the Johnson bar (reverse lever) would have to be in full reverse to go forward.
David
Moderato ma non troppo
Perth & Exeter Railway Company
Esquesing & Chinguacousy Radial Railway
In model railroading, there are between six and two hundred ways of performing a given task.
Most modellers can get two of them to work.
Reply
#9
Thank you, David. Still trying to find a wrench to fit the hex head. Found the one I have but it's too small and I'm trying not to damage all the nice detail on the engine. I'll post the result when I get it fixed.

Tom
Life is simple - Eat, Drink, Play with trains

Occupation: Professional Old Guy (The government pays me to be old.)
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)