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MG MG Y Type - Oil pressure gauge supply line.

So today I put in a new 3mm id flexible pipe between the two copper tube ends (ie through the firewall), as an oil drip had developed from the 4mm id hose I fitted 12 months ago. The only pipe I could find that is oil resistant is fuel line from the mower shop - and here's the rub - it's translucent, so an unintended consequence is that I can see the oil travelling along the pipe - but stopping some way short of the back of the oil pressure gauge.
The gauge indicates 50+ psi on the run, so no problem there. Is it not necessary for the oil to reach the rear of the gauge? - is it the air pressure building up ahead of the oil that activates the gauge mechanism? As I keep saying, we never stop learning.
Any thoughts appreciated as always.
John.


J P Hall

Hi John.
Pressure is pressure is pressure, it makes no difference if it's oil, air, water or whatever, if you have 50psi at one end of the hose you'll have 50psi at the other end as well.
I've seen people bleed the gauge line to get all the air out by loosening the fitting on the gauge (messy job) thinking the pressure will register more quickly, maybe it does if you had a line full of air as it'd take a poof of a second to compress the air compared to a fluid,but really it makes no difference.
Actually it's 'possibly' easier on the gauge having an air bubble in the line to work like a shockabsorber for the gauge. I'd leave it as is.
willy
William Revit

I knew I could rely on you, Willy. Thank you - I'll leave well alone and be grateful that 'Er Indoors no longer gets an oily sock. Cold at night up here these days - just nudging 12 degrees.
John.
J P Hall

12deg, -we're lucky to get that in the middle of the day here, although ,the last week has warmed up a tiddle. There's a place called Liawenee about an hour and a bit back from me here that has recorded it's lowest ever overnight temp for July at minus -12.9c You wouldn't want your wet socks on there eh.

willy
William Revit

Ha! - that'll be that reverse-osmosis-cum-global-warming-effect thingo, Willy. Hang in there mate, the sun will reach Tassie eventually.
J P Hall

Ha ha --Would you have an approximate date i can work with please--lol
V8 Supercars down here this weekend
They'll be having a good old moan about the weather--- then they moan all the time anyway-spoilt gitts. Unbelievable how they can get paid to drive and yet moan all the time --
William Revit

Hi all,
many years after dismantling it, I am now refitting my dash.
So this question arises.
Is there a sealing "washer" or such on the back of the pressure gauge where the back nut screws the pipe to the gauge.
Also any hints on the assembly sequence here would be appreciated. Connect the gauge and make the engine bay connection last?. NTG's replacement hose is quite long so it seems possible to have the connections made before offering up the dash to the cowl and screwing it in-place. That would seem to make it possible to fix the connection at the back of the gauge last.
regards Kevin M
K G Mills

Sorry Kevin - motorhoming southwards, so just caught up. I think your order of assembly is what I did - fiddle-arse around fixing gauges to dash, making sure earth connections are about double the original or WSM;then worry about the flexible oil line to the gauge. BUT - be sure to fit the tiny leather (or whatever modern equivalent) washer on the fitting at back of the gauge. Ask me how I know this! John.
J P Hall

Kevin, yes the NTG hose is LONG but long is good as you can cut it to length required. I connected it behind the battery box and then pushed it through the firewall and then cut the end to the required length that would reach past the soldered olive and then fit the clip past that too. Ended uo with a lot left over ... but then I'll save that for my YB when I do the same job on it.
Paul Barrow

Hi, thanks all.
re the washer, NTG have one at 63 p, but with freight at $50+ AUD, Ill be looking locally. Seems Mini's had same washer, and there is a Mini restoration specialist whatever near me. (Actually they have been very helpful in the past.) Just need dear wife to drive me there.
(Paul, in past I have grouped NTG orders, but then our $ was lot better too. Where I have used them , they have always been knowledgeable and helpful. Sourcing many things locally is OK too, but I am long since grounded these days, so still end up paying postage and handling. Upshot is it is good to get it right first go, so that is yet another reason why I value advice from you all.))
cheers KGM
K G Mills

This thread was discussed between 14/08/2024 and 11/03/2025

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