P 38 Oil pressure switch .

boycie · Mar 26, 2017

Could anyone tell me what the thread is on the end of the oil pressure switch on the 1999 thor 4.6 p38 ,I would like to remove it and fit a gauge to check the oil pressure prior to stripping the engine down ?.

tarphenry · Mar 26, 2017

it will probably be a bsp thread

boycie · Mar 26, 2017

That would be good ,I wonder if there is such a thing as a oil pressure test kit .

Saint.V8 · Mar 26, 2017

boycie said:
That would be good ,I wonder if there is such a thing as a oil pressure test kit .

There is I have one.....search my threads, I posted a vid of mine in use on my old P38....

Mine was relatively cheap from Amazon.

boycie · Mar 28, 2017

Thanks for that Saint , I have just ordered a kit ,my car runs fine does not smoke no oil light in fact the oil light goes out almost straight away the started is turned but if I let it warm up and stick my head under the front bumper you can heard the bottom end chattering .

Saint.V8 · Mar 28, 2017

If pressure is good and you still hear a chattering then your main bearing shells are probably due renewal....can be done with engine in car, or the timing chain is stretched causing a rattle....

boycie · Mar 28, 2017

That's what I though bottom end bearing's ,I will change them in a few weeks then maybe change the cam and chain .I keep looking at the print out of your how to change the bearings post it's really helpful .I will check the oil pressure and the pressure relief valve first .

Saint.V8 · Mar 28, 2017

boycie said:
That's what I though bottom end bearing's ,I will change them in a few weeks then maybe change the cam and chain .I keep looking at the print out of your how to change the bearings post it's really helpful .I will check the oil pressure and the pressure relief valve first .

Relief valve is integral to the front timing chain cover, there are two of them....I am sure I had a post or thread showing them and them also being taken out and measured.

boycie · Mar 28, 2017

That would be very handy I will do a search .

Saint.V8 · Mar 28, 2017

boycie said:
That would be very handy I will do a search .

This is the diagram....

This is the thread (I think I did so many on the oil pressure problem I had!)

https://www.landyzone.co.uk/land-rover/oil-pump-do-they-need-to-bed-in.270499/

boycie · Mar 28, 2017

So I should be able to change the outer one quite easily without removing the front cover ,I have a new O ring and cir-clip to fit.

Saint.V8 · Mar 28, 2017

boycie said:
So I should be able to change the outer one quite easily without removing the front cover ,I have a new O ring and cir-clip to fit.

It is doable with it still fitted, access can be tight mind. Also, the cap can get stuck, so remove the circlip and using a screwdriver up the filter bowl lever against the spring and you should be able to pop the cap off by adding spring pressure.

Not sure on the correct length, (its in RAVE) but once you have the cap off, pull the spring out and measure it, this is what confirms the amount of pressure that hold the relief valve in place....once the oil pressure increases beyond the spring tension it opens the valve. If the spring is too short, the valve opens too soon, if it is too long, pressure can be too high and cause it to blow past oil seals etc.

For some reason 62mm rings a bell, but check RAVE for the right measurement.

boycie · Mar 28, 2017

Thanks for your advice its been a great help .

P 38 Oil pressure switch .

boycie

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tarphenry

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boycie

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Saint.V8

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Saint.V8

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Saint.V8

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Saint.V8

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