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Project Car Oil Pressure

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Bill Greenwood Avatar
Westerville, OH, USA   USA
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1969 MG MGC GT
1972 MG MGB GT
1977 MG MGB
1980 MG MGB
I think these readings maybe cause for concern (see pics).

Engine runs great & compressions are all close to 150 psi.

It does blow some blue smoke out the exhaust though. Oil is brand new Castrol 20/50.

I have a spare sending unit so will try that & see if it makes any difference.

Bill.


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ron neal Avatar
Coastal, SC, USA   USA
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1962 MG MGA MkII
1968 MG MGC
1969 MG MGC
1969 MG MGC GT    & more
Bill
You might want to check oil pressure with a (gauge) if spare sending unit shows no improvement.
Ron

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billh1963 Avatar
billh1963 Bill H
Orangeburg, SC, USA   USA
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1963 MG MGB MkI
1967 MG MGB GT
1968 MG MGC GT
1969 MG MGC GT    & more
One of mine shows no oil pressure...although I know it's fine. From what I have read, those oil pressure senders are notorious.

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chuckmosher Avatar
chuckmosher Gold Member Chuck Mosher
Minneapolis, MN, USA   USA
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1953 MG TD
1961 Ford Ranchero
1962 MG MGA MkII "Othello"
1968 MG MGC GT "Tordos"
That's a tough one to diagnose - if no oil pouring out anywhere, and confirmed as low, could be relief valve, oil pump, bearings, ... No easy answers there !

Chuck

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Bearsails Avatar
Bearsails Michael Lippmann
Kingsville, Kingsville, Ontario, Canada   CAN
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1968 MG MGC GT "Blewe"
1969 MG MGC GT "Uh Oh" (Rusty Red)"
1972 MG MGB "Betty"
1973 MG MGB GT "Trouble"    & more
X2 on a pressure gauge to measure the oil pressure - don't like to trust the gauge on an old car that has been sitting...my 72 dash gauge showed almost no pressure (when we fired it up after sitting for 17 years) but my threaded in gauge showed pressure was normal. The tube to the gauge had a kink in it under the dash...

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Swamperca Avatar
Swamperca Swamper Ca
Calimexistan, North Mexico, -----------------   ---
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1970 MG MGB GT
1971 MG MGB "Rubee"
1974 MG MGB "Groovy B"
I like the Mechanical over the Electric type of gauge.

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PieterD Pieter D
Terneuzen, Nederland, Netherlands   NLD
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1969 MG MGC
Bill,

Is this wht you're looking for ?

Moss UK sells :
MGB & MGC USA MODELS 1969 to 1973 OIL PRESSURE SENDER SWITCH - 13H3819Z

have a look on ebay.co.uk or moss.co.uk


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Bill Greenwood Avatar
Westerville, OH, USA   USA
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1969 MG MGC GT
1972 MG MGB GT
1977 MG MGB
1980 MG MGB
Update:
OK, I tested with a gauge (no easy task especially with the auto transmission filler tube right next to the sending unit) and the pressure was close to 40 psi at about 1100 rpm. Reving the engine did not increase the pressure hardly at all.
So whilst not great, certainly a relief that the engine is not totally clapped out.
That was the good news.
Feeling confident that my back up sender unit would do the trick, I set about installing it. However, when I switched on the ignition, the gauge immediately rose to 50 psi (without the engine running). I guess I now have 2 bad sending units.

Pieter, thanks for the info on the sending unit, that's what I am going to need (much better solution than a reconditioned engine).

Bill.

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maartenl Avatar
maartenl Maarten L
Den Haag, Zuid-Holland, Netherlands   NLD
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40 psi cold engine, what's wrong with that, except, high...

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m.s.macrae Murray MacRae
Wellington, Wellington, New Zealand   NZL
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1968 MG MGC
1994 Subaru Impreza WRX
2000 Subaru Outback "A Bit Of A Dog"
2008 Mazda 6
Yup your oil pressure sounds OK
I would consider cleaning out in the the seat of your Oil pressure bypass plunger.
Also a fresh filter? Always go for the fresh filter even after only a few hours running. the crap in an old motor...

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