Garden Railway Forum

If the loco does not stall in a certain position then valve timing is not an issue?

The old man has assembled two 0-4-0 chassis for his new Garratt and they're both really tight. Is it brand new? If it is then the usual wear it in applies!
Another thing could be to due with curves and friction.
If not maybe the timing is only slightly out?
Hopefully this helps

Depends what you mean by tight? Where does it tighten in relation to crank position? Does it tighten in both forward and reverse?

The tightness can be felt with the loco not in steam on my table, it seems to be at this position both in forward and reverse:



Although it's fairly new it's been air tested and run in steam for a number of hours.

The resistance is only slight but you notice it when you shut off steam and the loco does not come to a smooth stop.

Probably the coupling rod on the other side. Put at the tight spot and try and wiggle all of the rods. They won't move much but the one that won't wiggle could be the culprit.

One thing we found to be generating a lot of tightness was the crosshead and slide bar, which would cause tightness in only afew places... We found out that the crosshead wasn't sitting properly, so it might be a good idea to check

The tightness can be felt with the loco not in steam on my table, it seems to be at this position both in forward and reverse:

If the regulator is shut, and the loco is new, could it be just cylinder compression?

Thanks for all your help and to Tony for the emails.

One of the weight shafts had slipped (my fault) as before I fitted R/C I was using a piece of rod to keep her in gear.