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Oil Pump relief valve

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Oil Pump relief valve #1
ldv-51TD Larry Vince Lansdale, PA, USA Sign in to contact 1951 MG TD	Topic Creator (OP) May 29, 2015 06:34 PM Joined 10 years ago 12 Posts

On my 51 TD with the old style pump, when cold the oil pressure is way to high (and evidently has been for years).
Even when hot at speed pressure of 70 - 80 PSI are the norm.
I took apart the relief valve, and everything looks ok (to the untrained eye), but...
The spring seems REALLY strong (I could barely fight the cap back on) AND the washer under the cap seems darned thin (it's a copper washer).
Does any of this sound right ? The ball and seat seem clean but I have a feeling (ya think?) that the relief valve is non-functioning.
My next step is just to get a spring and washer from Moss and see what I've got (won't break the bank in any case).
Comments (of the helpful type) ?

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Re: Oil Pump relief valve #2
Interceptor Mike Brand Shenandoah Valley, VA, USA Sign in to contact 1955 MG TF 1500 "The TF" 1956 Volvo TP21 "Sugga" 1963 Jaguar E-Type Coupe "401K" 1967 MG MGB GT "The GT" & more	May 29, 2015 08:51 PM Top Contributor Joined 11 years ago 1,200 Posts

Hi Larry,
The Specs I have on the Spring are as follows:
17 Gauge Wire - .056"
Diameter - .500"
Free Length - 1.476"
13 1/2 Coils
71lbs. when compressed to 1.063" *** ( That seems to be a LOT of pressure for .413" )

When I ordered a new spring, the one I received had a Free Length of 1.553". The old one I took out was 1.472"

Edited 1 time(s). Last edit at 2015-05-30 07:14 AM by Interceptor.

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Re: Oil Pump relief valve #3
ldv-51TD Larry Vince Lansdale, PA, USA Sign in to contact 1951 MG TD	Topic Creator (OP) May 30, 2015 06:16 AM Joined 10 years ago 12 Posts

Thanks Mike,

I just 'googled' the topic and found two other people who solved this issue be changing out the spring for a new one.
It's a low cost experiment in any case so I'm going to take a shot at it.

update:6/5 - New spring from Moss made all the difference. Pressure is now 50-60 lbs.

Edited 1 time(s). Last edit at 2015-06-05 08:07 PM by ldv-51TD.

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Re: Oil Pump relief valve #4
gingan2000 Roderick Padilla Shorewood, USA Sign in to contact 1932 Harley-Davidson Touring 1953 MG TD "MGTD" 1953 MG TD 2000 Jaguar XKR Convertible "Red Cat" & more	Jun 4, 2015 08:46 PM Joined 11 years ago 125 Posts

When I rebuit the engine of my '53 TD I put in new oil pump gears from Moss. Previously, I had 40 lb pressure consistgently, but since it now drops to 20 lb when warm. Moss' solution? Sand down the mating surface of the pump cap - I tired after hours on this. Seems wrong. Any advice?

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