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A publication of the Australian Railway Historical Society (ACT Division)

Edition 20 — 1 June 2003

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Of Pressure Tests
and Queen Bearings

Feature Article

By Max Fish


Saturday 10 May 2003, Canberra

Saturday 10 May was supposed to be spent preparing 1210 for Sunday's Mother's Day train.

(Small digression - Mothers and train trips?? They don't compute. Make it a restaurant-type lunch trip where Mum doesn't have to prepare it or wash up after and it certainly does compute).

There was 1210 still in its boiler test rig and definitely not looking like it would be operational next day.

With no other of the steam crew around at that stage, it was do something else in the meantime.

Peter Dickson was preparing to attach a large steel H-pattern bracket to wooden framed and bodied side corridor carriage BJ 897.

Bolted onto the bracket is the queen bearing which fits into the king bearing on the bogie to enable the bogie to swivel (I might have the royal family reversed but you will get the idea).

The queen bearing was originally bolted onto a large wooden bolster running across the carriage frame.

Over the last hundred or so years, the bolts have enlarged their holes in the wood so that the queen bearing itself has been moving on the wood.

Removing the bolts is not possible without dismantling a good deal of the end of the car. This is a heritage vehicle held in our care, so that option would not be allowed.

The steel bracket is shaped to take of the fore and aft bogie forces away from the four original bolts altogether and to share the sideways forces over six additional bolts.
Frame bolster showing queen bearing mounting point

Queen bearing mounted on steel bracket

Steel bracket and queen bearing ready for mounting
Queen bearing and bracket mounted on car
Steel bracket and queen bearing mounted on car
The bracket plus queen bearing are quite heavy, so the fork lift was used to carefully raise and position the bracket until first one end and then the other could be temporarily secured.

We just wanted it to be safely held in place. The permanent securing with correct nuts and washers would be done during the following week.

BJ 897 was made operational for the Centenary of Federation train. It and BVJ 1457 are used as additional cars for our end platform set on special occasions.

Problems with both bogie bearings were noticed during running and have both now been corrected as shown here.

The other end of the car held the greatest problems because at some time in its railway life it had had an extremely heavy shunt. A steel bracket under the car holding the buffer spring gear had been mangled.

Interestingly, there was no damaged woodwork. The bracket had to be replaced totally rather than being rebuilt.

In addition, both drawgear springs came out in about six pieces each. These have also been replaced.

By now, we knew the problem for 1210. The bottom end plate gasket of the boiler pressure test pump kept failing during the test procedure.

The gasket is reinforced rubber about half a centimetre thick.

The pressure was distorting the gasket near each of the two water passages leading to the valve chambers of the pump.
Boiler pressure test pump with blown bottom gasket
Boiler test pump with end plate removed
Line

Rotated Kerry Mellor smiling on a diesel
Pressure-resistant gasket material was purchased and Kerry Mellor cut a new gasket for the pump. Here is a historic picture taken that day of Kerry actually smiling while in a diesel!!! "Why did that smelly box fail?? Somebody forgot to clean out the amps-pan???"

The team now prepared 1210 for another test. A hot boiler is wanted to check the boiler under heat and pressure. Care being taken not to actually generate steam.
Boiler test being set up
John Goodban is on 1210's footplate supervising the wood fire. Paul Barlow is speaking to him, watched by John Cheeseman.

Further back, Michael Potter checks things out. D25 was brought up to supply air to the pump.
D25 supplies air to test pump
Under test, the new gasket also failed at about 160 lbs/sq in, when we needed 168 held for 20 minutes!! We found that the pressure had to be brought up, released and the end plate nuts re-tightened; with this procedure being repeated a number of times before the gasket would hold.
160lbs/sqi the only time
1210's pressure gauge now showed the highest reading I have seen on it. One I do not want to see with the boiler under steam!!

You can also see the supply from the boiler test pump connected to the deck hose fitting. The pressure would not go any higher, though. A look under 1210 showed why. The seal on the boiler belly plate had failed with plenty of water coming out.

Oh well.
Needless to say, the Mother's day train was diesel hauled. Here, 4807 does the honours with David Malcolm checking the train out of the platform.

4807 has its own gasket story. You know the one about ordering a part for the car and the wrong bit is always sent. It happens with locomotives too!

As the train passes the Bungendore goods shed, the hard work of our carriage restoration team can be seen.
Mother's Day train departs Bungendore
Mother's Day train passes Bungendore goods shed


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