Sorry Mick... ∆
That O ring is vacuum not pressure. If it leaks it sucks air = no oil pressure.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Onya Doc...Ummmmmm....whaddabought if the engine is not breathing and pressurises the sump

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"Show me the Mini!"

Talking about that blasted O ring, a while ago I assembled the engine and g/box and installed it. I paid particular attention to the O ring while doing so. Cranked and cranked, no frigging oil pressure. Took the whole lot out, couldn't see any obvious problem with the O ring, put another one in. Installed the lot and hey presto, had oil pressure. No idea what the problem was/ what I'd done wrong 1st time around...

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67 Deluxe
Dry suspension
1293cc, 11:1 comp, RE 282 camshaft, 45 Weber, extractors etc
4 synchro close ratio gbox
Cooper S brakes, no booster
Stealth box, as Doc says "goes harder and idles!"
RH tank cos I needed it crossing the Nullarbor etc..

Maybe the first time...the oil pump wasn't "primed" and wasn't picking up oil?
Did you have the plugs out whilst cranking it? and
Whilst watching an oil gauge for the pressure to come up?

[I know!! Questions!! ]

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"Show me the Mini!"

9YaTaH,

Yes to all the above! I did everything in my power to avoid removing the blasted thing! Spent hours on it until it dawned on me it just wasn't going to happen...

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67 Deluxe
Dry suspension
1293cc, 11:1 comp, RE 282 camshaft, 45 Weber, extractors etc
4 synchro close ratio gbox
Cooper S brakes, no booster
Stealth box, as Doc says "goes harder and idles!"
RH tank cos I needed it crossing the Nullarbor etc..

Some faults can really try your patience

Back to pumping out oil....pressure relief valve issue?

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"Show me the Mini!"

no Mick - he said it drained out while the car wasn't running, it can only have leaked out past a seal - no pressure involved, oil sitting in the sump

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did I tell you that I won a trophy?

and your suggestion is

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"Show me the Mini!"

I just started to try and change the fuel pump is there a easy way to change it while the engine is still in the car?

Recently put an engine on a gearbox and measured the O ring before fitting it. It was undersized for the depth of the machined groove in the gearbox flange - i.e. the O ring wouldn't be crushed when the 2 were mated in the joint.
Rang the suppliers to point this out.
Used an O ring from an old gasket set.

take the carb off, and maybe the exhaust manifold too - gives a lot more access down the back of the motor

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did I tell you that I won a trophy?

Is it an SU pump? They are a greater diameter than the original Goss pumps. You can do it but you'll take skin off.

The same as the normal one ive disconnect all the piping just need to get at the bolts holding the damn thing in

Ok after changing the fuel pump there are no more leaks but the car cuts out under load. It idles and starts fine. As soon as i get up to speed in 2-4 gear it starts to cut and makes a misfiring sound. I think its a carbie issue would that be a good assumption?
How would i go about cleaning the carbie and find the issue?