MGB & GT Forum

I am at checking oil pressure before startup on my 64. New oil and filter.
1.Removed plugs. Cranked for an extended time and no oil pressure at gauge.
2. watched video by John Twist on oil flow. My understanding is that is goes to cooler, filter and then channel in block to the port
for the pressure gauge.
3. Fabricated the gauge in photo and checked output before cooler - 55-60 lbs
4.after cooler ,before filter- 55-60 lbs
5.nothing at all comes out of oil port for gauge. Blew air through, no obstruction so I must have a
problem in the filter assembly?
Here is what I have. The filter I got did not match what came off, but installing the old filter did
not change anything.
Thanks in advance for the help



Edited 1 time(s). Last edit at 2014-08-20 01:28 PM by Philfjord.

Can't help, but VERY wise to not fire it up until you know you have oil pressure. Stay tuned, smarter folks will come by.

Is this after a motor rebuild, or just an oil change?

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1974-1/2 Roadster, "Bumble Bee", Corvette Yellow - in shambles, wire wheels
1976 Roadster, "Virus", Sandglow - "driver" condition (stock + 32/36 Weber DGEV, cast iron header, 25D distributor), bolt on wheels, ON the road!

Bill,

I suspect you may be connecting your oil pressure gauge to the wrong port on the block. The port just below the distributor actually taps into the coolant passage. Be sure you're tapping into the small port directly behind the distributor and in front of the large fitting to which is connected the large hose for the oil cooler. Also, be certain that the correct OE fitting is installed at the back of the block where the oil cooler hose connects, since this is critical for proper oil flow through the block....

Dick

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Errabundi Saepe, Semper Certi
(Often wrong, but always certain)

A picture to go with Dick's description.

Thanks Dick.
When I blow through the port I'm checking air comes out the oil filter boss in the block.The fitting should be the right one, as I can measure
60 lbs coming out of the cooler with the output hose connected. From what I can tell, The pressure goes into the filter and does not travel into
the holes that channel along the block.

You didn't mention priming the pump, though you did turn it over. My understanding of the "gerotor" pumps is that they need some oil in the pump to accomplish the suction phase on the rotor, thereby sucking the oil up from the pan. I just did this on my bugeye: I unscrewed off the big oil pipe (described above), poured a some oil into this passageway in the block, reattached the pipe, then I took off the little oil line for the gauge and watched it while cranking the engine (plugs removed), oil starting spurting out, so I reattached it. You likely already know this and maybe already did it, so maybe it'll educate someone else if common knowledge to you.

EDIT: I was writing this when you wrote what was above. So never mind my suggestion.



Edited 1 time(s). Last edit at 2014-08-20 02:47 PM by threadless.

I think you need to disclose the oil filter you installed. You say it was different than the original. Some ditz at the parts store may have sold you the wrong one.

Worth a shot. Someone should know.

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Wayne Sanders
Rose Lodge, OR
(TD 4288)

"I don't care to belong to any club that accepts people like me"-joined Willamette Valley Club in 2011

79/65 MGB - Carmine- V-6 - T-5

This car is now very nearly completely done. Sure to find something else, but not now.........And 12 years later, I'm starting to fix things that were new when we built the car. It's pretty well de-bugged!

The "old" filter looks smaller than the new one.

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Shaun Johnson
1972 MGB Tourer, Second Owner

Ok
This problem is fixed!
I now have oil pressure but I don't quite understand why,maybe the flow inside the filter was restricted.
I was back flushing the pressure port and it was clear. So I assembled everything and checked the port today with the new oil filter,
just double checking everything to make sure I didn't stupidly miss something .
Same.Then I disconnected the cannister input line from the cooler to the filter and blew through it with compressed air-after it was full of oil.
(I did this yesterday without the same results because it was not full of oil.)
Some really old looking oil came out of the gauge port with some air blasts that were trapped somewhere.
That did the trick.Showed 20 lbs. with the starter motor. After sorting a few things she started up and
sounded awesome and my oil pressure is quite healthy.Next -get me a cooling system and take her out for a drive.
I would like to point out that I would probably not have been able to figure this out without John Twist's
video on Oil pressure flow. Thanks John and thanks to the poster's who pitched in.



Edited 1 time(s). Last edit at 2014-08-22 12:23 AM by Philfjord.

You're almost there, Bill. (I have better pictures of your car than that chopped van, BTW!)
Chris...

Chopped van? Haven't you ever seen an MG minivan before?

LOL! You did say you liked weird stuff.
Chris...