Morris Minor Owners Club

That in itself doesn't worry me too much - idle speed etc can come in to it. But the comment re coming on during gear changes.... now that DOES worry me.

It is on all of the time now, even from cold

It was running fine before the oil change so to me common sense tells me that nothing was majorly worn out, surely It would have given some notice that something was wrong before the oil change!

Kyle

Kyle,

I would replace the oil pressure switch before using the car anymore.

For immediate peace of mind, I would just change the switch - there is really no point speculating about what it might or might not be until you eliminate the most obvious things first. Although tricky to get at, the swap should take you about 20 minutes or so. At least if the light comes on with the new switch fitted, you will know you probably DO have a serious problem that needs looking at urgently. If the light does not come on, especially after recreating the conditions where it came on before, you will know it was the switch.

From what you say the engine appears to be running well, with no obvious rumbles, knocking or signs of excessive wear - such as high oil consumption etc. so, to me, it does seem to point to a faulty switch.

If it were my car, I would spend a few pounds and fit a gauge asap. It takes about the same time as fitting the switch to either fit a sender unit for an electronic gauge or the pick up pipe for a capillary gauge. Another half hour to wire it in and Bob is your fathers brother!

At the very least I would fit the switch Do it tomorrow and then you'll know how things stand and can address alternatives on Monday

thanks Brucek, I will fit the switch and let you all know later!!

Make sure you unscrew the right thing - it has a wire coming from it, and not the big nut underneath, which is the oil pressure relief valve and WILL be a pain to screw back in.

Did it work????

Hello folks, sorry I haven't replied, I made it to Blackpool! It was a faulty switch after all that worry. I have also taken your advice and fitted a smiths gauge which fits nicely in glove box.

Thanks too all for your help and advice !!

Kind regards

Kyle

as I suggested nothing major

did you have a good time

And so - what pressure is it showing when running along (hot) at 50 mph??? And I hope you changed the filter........

Yes thanks Alex the weather was lovely!

40 to 45 when hot at 50MPH

Is that the max figure? If so - it's 'just' ok.......

After a good run it does go up to around 50 55, I had everything checked over by an ex BMC engineer (my neighbour) and he said the engine was in beautiful condition

I'm sure it will be fine...........

And what should it be, ideally?

Good solid 60 psi when hot at any decent revs.

A solid 60. I'll bear it in mind, thanks.

I was generally told the rule with these was a minimum of 10psi for every 10mph taking into account the minimum of around 20psi at tickover when hot. Mine goes to 70psi at tickover from cold and then follows the above rule when hot.