|
Post by ettingtonliam on Sept 17, 2021 19:16:21 GMT
It looks quite dry compared to the other cylinder don't you think? This maybe suggests the oil feed to this cylinder is suspect. Might be worth checking. Would explain the squeak on that side.
|
|
darrene
Part of the e-furniture
Posts: 440
|
Post by darrene on Sept 18, 2021 6:51:34 GMT
Ah, yes it does i should have noted that I'd cleaned it up a bit after removal! It was nice and oily at the start. I am confident the noise is being caused by the pressurised air whistling past something internally rather than a mechanical squeak,as nothing seems dry. Would some blow past of the packing be able to cause this? The only other thing it could be is the valve on that side perhaps. It'd probably pay me to pull that out and check it...
|
|
JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,909
|
Post by JonL on Sept 18, 2021 17:58:19 GMT
There is a firm divide of two camps (both with strong, well reasoned arguments) with regards to piston sealing. Personally to me this looks like an ideal opportunity to fit O-Rings.
|
|
|
Post by ettingtonliam on Sept 18, 2021 21:28:44 GMT
This will mean new pistons to get the groove sizes right for O rings. Do you really want to do this? If not, just repack the pistons you've got with fresh packing. It will be fine.
|
|
darrene
Part of the e-furniture
Posts: 440
|
Post by darrene on Sept 24, 2021 16:59:12 GMT
The project Britannia is still squeaky from the RHS cylinder on compressed air I’ve tried changing the piston packing in case the cause was blow-past there. That didn’t solve it (although I can definitely feel an increase in pressure when covering the exhaust, so it was worth doing). I beginning to wonder if it’s the RH valve not completely closing so I started off checking the timing first. That has made for interesting reading - both sides seem spot on at BDC - when at this point there’s zero valve travel of the valve stem. But on both sides at FDC there’s some valve stem travel which there shouldn’t be. Am I right in thinking It means the angle of these eccentric arms may be slightly advanced/retarded or could something cause it? If it is these arms, you can probably spot the problem I'll have in adjusting them... In any case, next task is to pipe the cylinder drains into water and check whether any bubbles appear at the extremes of the valve travel with the cocks open and pushing some air into the steam chest
|
|
darrene
Part of the e-furniture
Posts: 440
|
Post by darrene on Oct 11, 2021 15:31:52 GMT
Rather confusingly, the project Brit sports both a twin-output lubricator and the LBSC-spec single-input non-return valve tee-d into the steam feeds.
The lubricator has ball bearings in the outputs but no springs I note, to keep them forced against the pump outlet faces.
So I suppose the question is whether to
a) remove the single input Tee-piece, fit springs in the the lubricator outlet passages and plumb one to each steam feed b) keep the Tee-piece, blank off one of the lubricator outlets and pipe the other to the Tee.
(a) feels like the better approach, would anyone agree?
Darren
|
|
|
Post by ettingtonliam on Oct 11, 2021 20:04:00 GMT
Agree!
|
|
darrene
Part of the e-furniture
Posts: 440
|
Post by darrene on Dec 8, 2021 21:45:51 GMT
Another huge thanks to George at GB Boilers. He plugged up the backhead regulator hole on my Brit boiler, put a regulator bracket mounting pad and spigot for my smokebox mounted one, put a pair of top feeds in and a missing front blower bushing for me. He even noticed that the original steam dome bush wasn’t quite flat and reseated that. All for £100 and pressure tested. It really is the season of good will. Thanks George
|
|