AMR Mod Refurb Seal

baz said:
The MK3 plunger actually seals against a flat washer not a conical one
Click to expand...

It isn't completely flat. The Mk3 plunger does seal against the raised centre. The timing cover seals against the flat section.

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kommando said:
Counterintuitively, a sharp metal edge is less likely to get a piece of crud sticking to it than a wide edge. I rejected one non return valve that did not work because it kept getting very small pieces stuck to the seat so the ball did not seal, but I did not go for a knife edge but instead settled on a rubber seat.
Click to expand...
You raise a good point 👍
 
I noticed recently when I fitted a new pump and changed out the SRM OPRV to the mk3 cover my oil pressure cold now reads 60 + compared to 50-55psi in the mk2 timing cover...
Happy now its stopped dribbling...but I'm sure it was the plunger mk3 cover...than the new pump that has shut down the wet sumping...
 
L.A.B. said:
It isn't completely flat. The Mk3 plunger does seal against the raised centre. The timing cover seals against the flat section.

andover-norton.co.uk

Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts

Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.
andover-norton.co.uk
Click to expand...
Yep I know it's not completely flat
I should have said it's not the same as the pre MK3 comical type
 
On mine, the ball was seating on the o-ring instead of the bush because the o-ring was severely deformed...looked to be over-squished (technical term). On reassembly I will match the bush to the ball and see if I can manage the squish. Thanks to all...Good Stuff.
 
kommando said:
Counterintuitively, a sharp metal edge is less likely to get a piece of crud sticking to it than a wide edge. I rejected one non return valve that did not work because it kept getting very small pieces stuck to the seat so the ball did not seal, but I did not go for a knife edge but instead settled on a rubber seat.
Click to expand...
You settled on a rubber seat? - Would you mind explaining that as I thought the ball sits on the pump outlet?
 
Nourish said:
You settled on a rubber seat? - Would you mind explaining that as I thought the ball sits on the pump outlet?
Click to expand...
I was referring to a non return valve I placed into the feed line before I did the AMR mod. But if you picked the right seal to go over the pump outlet then it would be possible to get the ball to rest on that instead of the steel pump outlet, maybe a X seal would go that. Or go for a rubber ball.
 
I prefer the AMR system where to ball seats against the steel pump outlet bush. (Mk3 is steel "bullet" on rubber)
I think I improved the AMR by using an appropriately radiused dremel stone to create a matching "seat" on the bush end for the ball to sit in.
I think there's a reason that industrial hydraulic check valves have steel-on-steel components, and that is durability.
 
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