Rebuilt Crosti 9f

spikey faz

spikey faz

Western Thunderer
chigley said:
Mike, on the standard 9f there's a double row of bolts/rivets down the centre line of the box
same as the side.

Ken
Click to expand...
I've found few pictures of the top of the firebox, but from what I can see there is a single row of rivets. If you can point me in the direction of reference pictures, that would great.

Thanks
Mike
 
spikey faz

spikey faz

Western Thunderer
Just working on the brakes at the mo.

20221211_104746.jpg
The kit instructions show that there are twin pull-rods down the full length of the loco. However, Mickoo's earlier post seems to indicate there was a switch to a single pull-rod underneath the ashpan. Can anyone confirm this for me? Detailed pictures of this dark and gloomy area are hard to find.

Cheers
Mike
 
OzzyO

OzzyO

Western Thunderer
Hello Mike,

reading Mickoo's post says that the twin pull rods are under the ash pan and single rods run to the front.
I can understand the logic of this the ashpan is opened and the ash just drops into the ash pit with nothing in the way.

ATB

OzzyO.
 
spikey faz

spikey faz

Western Thunderer
OzzyO said:
Hello Mike,

reading Mickoo's post says that the twin pull rods are under the ash pan and single rods run to the front.
I can understand the logic of this the ashpan is opened and the ash just drops into the ash pit with nothing in the way.

ATB

OzzyO.
Click to expand...
That makes more sense to me. :thumbs: Just means I've got to redesign the brake beams that came with the kit. Ho hum!

Mike
 
Dave Holt

Dave Holt

Western Thunderer
Mike,
Not quite. 9Fs had two (steam) brake cylinders operating two separate systems. On your diagram, the single pull rod between the 2nd and 3rd axle doesn't connect the two cross beams but is shorter and connects to the front brake cylinder via a bell crank, as shown on my rather scrappy sketch, which also includes part of a drawing from the Dave Bradwell chassis kit instructions which shows the support bracket for the front crank (part 14).
9F_brake_rigging.jpg
Hope this helps.
Dave.
 
spikey faz

spikey faz

Western Thunderer
Dave Holt said:
Mike,
Not quite. 9Fs had two (steam) brake cylinders operating two separate systems. On your diagram, the single pull rod between the 2nd and 3rd axle doesn't connect the two cross beams but is shorter and connects to the front brake cylinder via a bell crank, as shown on my rather scrappy sketch, which also includes part of a drawing from the Dave Bradwell chassis kit instructions which shows the support bracket for the front crank (part 14).
View attachment 176145
Hope this helps.
Dave.
Click to expand...
Thanks Dave. :thumbs:
That clears up that little mystery.

Mike
 
spikey faz

spikey faz

Western Thunderer
OzzyO said:
Hello all,

would the Crostis have enough room to fit the front steam brake cylinder in place when they had the preheat boiler in place? If not would B.R. have gone to the trouble of fitting one when the preheat boiler was removed, I think not.

Just something to think about,

OzzyO.
Click to expand...
Hmm. Not sure. We'll possibly never know. I'll probably go with the conventional 9f set-up. It's not hugely visible anyway. But thanks for your thoughts on the subject. :thumbs:

Mike
 
Dave Holt

Dave Holt

Western Thunderer
I don't think the pre-heater was low enough to affect the continuous horizontal frame stretcher and the brake cylinder was below that. The RCTS BR Std Steam Loco book, Vol 4, specifically states that the Crosti locos had two brake cylinders, one operating on the two leading coupled axles and the other on the rear three - same as the standard locos.
As already mentioned, the front brake cylinder isn't visible from normal viewing positions although the crank mounting bracket, crank and pull rods are.
Dave.
 
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