Day 2 Tuesday 11 June 2013
Started the day where we left off. And by we, I mean the team of volunteers all doing numerous assigned jobs. I'm only telling my side of things, there are a half a hundred other things going on at the same time.
Here is the stamping on the steam valve. It had gone Un-noticed previously, in the listing of orphan parts donated to the 315.
This is the Steam valve. It is opened by the engineer by moving the throttle handle. The throttle bar pushes up on the bottom of the valve and opens the valve so steam can flow to the cylinders. Really quite simple, but a complex piece.
This whole part sits atop of the dry pipe, Sealed with a copper gasket.
This is the valve itself, two seats, top and bottom, the top is larger then the bottom.
The seats are lapped by applying a honing abrasive (500 grit) to the valve seats and using a back and forth rotating motion, to finely grind the mating surfaces to match each other.
Great care needs to be taken while honing to prevent grinding the mating faces into a non round shape.
Finished, and ready to install.
The copper gasket to seal the valve assembly to the dry pipe is a custom cut piece (read $) and for the hydro testing we will re-use the old one, saving the new one for the final assembly. Before pic.
After cleaning and polishing.
Before we put the steam valve in the dome, an internal inspection of the boiler is required. Yes, a body has to get into the boiler and do an inspection. I don't fit in the little opening at the top of the steam dome. I was "spotter" for "Dave" (not me) that did.
Internal boiler checked out as all good.
Note to OSHA types: No harness as it poses a significant threat to get entangled in the restricted space,
And the drain plugs were pulled for 24 points of ventilation into the boiler.
Drain Plugs: There are 24 on 315. A drain plug is just that, a plug that fits into the side of the boiler to allow clean out and draining.
They are brass/bronze material and they are all a different size, have a tapered thread of 12 tpi. Each one goes into only its own hole.
"Copper Coat" on all threads and really tight. (big wrench) Square head 1 1/2" across.
This is the collection pipe for the Cab turret and all the valves to control the appliances on the locomotive.
The other end goes to this:
You super detailers try to make this mess. More on the turrent and valves and etc. on another day.
The steam valve got installed on the dry pipe and torqued really tight ( 3 foot cheater bar)
The valve is setting on the dome edge, awaiting being seated into the valve assembly.
Working above the open boiler, one has to be very, very, careful not to drop ANYTHING down into the boiler, Bad things can happen to a boiler if stuff gets down into the tubes area. Rule: if you drop anything into the boiler, you have to be the one to go get it.
The valve ready to be seated, The control shaft was left out as Un-needed for the hydro testing of the boiler.
Moved on to the Brake air valve at the front of the engine that had been leaking previously. It's a Westinghouse valve, and needed to be opened up, cleaned, honed, and reassembled. Very typical procedure on a steam loco. The valve.
The tapered surface needed to be honed for a good clean fit. Again 500 grit compound and about 20 minutes of hand lapping did the trick.
Thats it for today. Tomorrow we button up the dome and finnish up on a list of things to get done for the hydro testing scheduled for Thursday when the FRA inspector is here.