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#900825 01/21/23 10:22 am
Joined: Jan 2022
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Hi All

Just rebuilding my 1964 Rocket's bottom end. New Timing side bush, crank ground, new shells, etc. The oil pressure release valve looked like it hadn't been removed for many years and the gauze was gummed up. The value is the original flat head type. Looking at replacing the spring and ball, but question is - are the new dome type more reliable and therefore preferable to be fitted as part of the overhaul or should I save my money and just spend £5 on replacement spring/ball?

Cheers

British motorcycles on eBay
Joined: Aug 2001
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Chappers,
If you look at the beginning of the BSA forum there is a topic "Mr Mikes OPRV valve". I never could not get decent oil pressure out of my 66 Lightning even after a meticulous rebuild, so i came up with the simple conversion that replaces that BSA pressure relief valve. It worked very well resolving my low oil pressure concerns. It applies equally well to the piston type or ball type relief valves. Several members of this site tried it with equal success. Might be worth a look-see.

Mr Mike

Last edited by Mr Mike; 01/22/23 7:25 pm.
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The stainless ball and spring oprv units from Lyford classics are very good. My mate had one of the SRM units fitted and the light kept on coming on at tick over. I had one of the lyford units fitted to my bike and was happy with it. He fitted one too and the light only comes on now when the motor has stopped.

On a side note, if that was gummed up… what else is?


Life is stressful enough without getting upset over the little things...

Now lets all have a beer!

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

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thanks - the engine has been stripped so nice and clean inside, including a new sludge trap.

1 member likes this: Allan G

Moderated by  Allan G, Jon W. Whitley 

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