A10 anti wet sumping ball valve modification to A65 setup photos and dimensions

[limeyrob]

OK, apologies for thread resurrection, but this is very topical for me.
I'm looking at pictures of the A10 spring, 67-1400 and it has much lower spring rate so it will move more (my guess is about double) for the same force, this is not the same as the un-seating force which will depend on pre-load.  Do we have any numbers for what it takes to move the A10 ball off its seat?  I mean force on a rod poked in the oil hole.  The 2 cases I have are really different just from feel, the "rebuilt" one takes about half the force of the apparently original one.

[Swarfcut]

 Who knows what lurks beneath. Have a look at previous posts about that spring. New, Old, Fatigued, Spurious, Broken. The only way to be sure is to obtain the genuine article from a trusted supplier, and replace along with a new ball onto a well sealing seat.

 Dunno, but there may be some data on the Forum already, as this topic regularly makes an appearance.

 Swarfy.

[limeyrob]

I did a lot of searches but no one seems to know the spec.  Since I posted that I've bought a NOS spring and ball so I'll fit that and compare with what comes out.

[chaterlea25]

Hi All,
Just too finalise my previous posts, the Ariel Huntmaster got a Hepolite oil pump and has the A65 ball position against the pump..
No sighs of wetsumping even when left sitting for almost a year

John