AMR Mod Refurb Seal

Yakatak

Yakatak

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I had the AMR anti wet-sumping mod performed about 15 years ago. I need to get into the timing case and want to replace all the seals while I'm at it. Is there a generic replacement for the pump to cover seal, or will I need to get it from AMR?
 
It is a generic O ring. Once you get it out, you can match it up at your local parts distributor. You can use Neoprene or Viton, I prefer Neoprene.

Slick
 
Hoping someone can provide the actual size of this O-ring. Mine is too mangled to get any measurements. Tried to contact AMR but no response.
 
1/8" X section 1/4" ID 1/2" OD is what I use but not from AMR as its from

AMR Mod Refurb Seal
 
Just got a cover and oil pump back last week from AMR. Here are the measurements of my spare o ring. ID 6.2mm, OD 12.8mm, 3.5mm thickness.

Corey.
 

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Last edited:
@knOck4times

How about giving us
ID, OD, AND SECTION

I am frustrated trying to blow up the images and keep the readouts visible.

Slick
 
The readings are the metric equivalent of 1/8" X section 1/4" ID 1/2" OD taking into account the inexactitude of measuring a rubber doughnut :eek:.
 
With the AMR mod the ball seals against the tip of the bush whereas the Mk3 plunger seals against the conical rubber seal
 
When I removed the timing cover last week, the ball was sealing (or attempting to seal) directly on the O-ring. Is something missing:eek:
 
Yakatak said:
When I removed the timing cover last week, the ball was sealing (or attempting to seal) directly on the O-ring. Is something missing:eek:
Click to expand...

The ball seals directly on the O Ring. In Reply #2, I suggested using Neoprene ,(Buna N) (max Temperature = 240 F ) rather than Viton, max Temperature = 450 F, because IMO, the stainless ball seals better with Neoprene. With sufficient crush on the O Ring, it may not make a difference, but I was worried about the case of minimal crush.

I have not found a good way to estimate how much crush I am getting.

Slick
 
texasSlick said:
The ball seals directly on the O Ring. In Reply #2, I suggested using Neoprene ,(Buna N) (max Temperature = 240 F ) rather than Viton, max Temperature = 450 F, because IMO, the stainless ball seals better with Neoprene. With sufficient crush on the O Ring, it may not make a difference, but I was worried about the case of minimal crush.

I have not found a good way to estimate how much crush I am getting.

Slick
Click to expand...
Actually (checked with AMR) the ball seals against the end of the bush - hence I ground my bush with Dremel stone to same diameter as the ball.
 
Last edited:
robs ss said:
Actually (checked with AMR) the ball seals against the end of the bush - hence I ground my bush with Dremel stone to same diameter as the ball.
Click to expand...
I wonder why they (amr) don't take/make the extra effort to insure....perfect seating of the ball to bush...nice job Rob👍
 
KiwiShane said:
I wonder why they (amr) don't take/make the extra effort to insure....perfect seating of the ball to bush...nice job Rob👍
Click to expand...
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.
 
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