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MG TD TF 1500 - Bizarre oil pressure

Hi

As per my previous low oil pressure post I have renewed parts in my oil pump which were badly worn. As a belt and braces I also ordered a suppplementary spring for the oil pump. This

http://www.mgbits.com/contents/en-uk/p2482_Spring_-_Supplementary_-_Oil_Pump.html

I rebuilt the pump and fitted the normal relief spring and the supplementary spring. Oil pump primed and turned over for about 30 seconds without plugs I was ready for the big start. To my horror the oil pressure on start up rose and rose at 120psi I cut the engine expecting to see an exploded oil filter or oil spewing out of every conceivable joint. Fortunately nothing so I took out the supplementary spring and fired up again. This time normal 60psi.

The question is has anyone used one of these springs and found the same problem?

Barry
B Bridgens

Barry , I never had the problems as you discribed.

For sure your oil pump works great, but two springs in the relief valve ??? Never done that .

Anyway your pressure is fine now enjoy the car this summer.

Gerard
Gerard Hengeveld

Barry wrote:

To my horror the oil pressure on start up rose and rose at 120psi ...


Shouldn't the bypass valve prevent such a high pressure?
Bela

Originally that extra spring was called a "60/80" spring. The BMC catalog from the 60's calls it a "booster spring" with part # 706/226. The BMC catalog from the 60's also lists it as NA, not available. A.S. lists one for sale, though I have not seen one of theirs. There has been quite a problem with the regular booster springs being all wrong in aftermarket, and likely the booster springs, too. Both the original and booster spring (60/80) had 13 windings. 120 psi is all wrong for a spring that is supposed to deliver 80 psi max. Pic is of known 1956 era (at the latest) springs.

D mckellar

If you don't want to fiddle with two springs, Just get the adjustable oil relief valve that Moss sells.

http://www.moss-europe.co.uk/oil-pressure-regulator-adjustable-435-550.html
Bruce TD4139 Cunha

Hi

Thanks for the replies.

Bela I think the extra spring was keeping the relief firmly shut.

Bruce I am quite happy with the pressure without the extra spring, it will be OK until I can do a full strip and rebuild.

The small spring in the picture is exactly what I got.

The extra spring has been confined to the scrap bucket.

Barry
B Bridgens

This thread was discussed between 09/04/2016 and 10/04/2016

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