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Unless it's jammed open then it probably is working to slow the rate of drainage (you could remove it to check) but may not stop it completely because the oil can leak across the pump (and then to the sump) through the pump shaft clearance, hence the AMR pump shaft O - ring modification.[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/mk3-timing-cover.30982/post-487213[/URL][URL unfurl="true"]https://www.accessnorton.com/NortonCommando/wet-sumping-oil-pressure-relief-valve-and-amr-modification.18868/post-281852[/URL]
Unless it's jammed open then it probably is working to slow the rate of drainage (you could remove it to check) but may not stop it completely because the oil can leak across the pump (and then to the sump) through the pump shaft clearance, hence the AMR pump shaft O - ring modification.
[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/mk3-timing-cover.30982/post-487213[/URL]
[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/wet-sumping-oil-pressure-relief-valve-and-amr-modification.18868/post-281852[/URL]
