Motorcraft base end bypass valve pics

[KDonkey]

Not sure I like this. From an FL-910S

So this metal plate is supposed to hold the valve closed,
but doesn't really put pressure on the outer edge
of the disc in most places.

So if I can pry it up with my finger then why can't
oil push through this without moving the spring?

Also the disc is nitrile and does not keep its shape
after normal service. Much lower quality than the
silicone anti-drain flap.

hires images in imgur album

 

[ZeeOSix]

Maybe the spring doesn't move at all - it looks pretty stout to me. Maybe the rubber just flexes upwards like you show it with your finger when the delta-p gets high enough.

Or is the outside circumference sealed somehow (when it's all assembled), and the spring does move upwards and open up the ID of the of the valve (?).

 

[Oro_O]

You are not alone. See the recent threads from myself and BlueOvalFitter about MC filters that leak down and refuse to hold oil. Ridiculous. And I was a serious MC filter fan; this is not pre-biased.

 

[WellOiled]

A leaky relief valve would not cause an anti drain back leak.

 

[goodtimes]

In another thread someone posted this link:

http://asset01.drivewebsite.com/Site/529...n_2014.pdf?v=49

They show oil passing over the top of the rubber seal not from under it. Don't know if it's right or exactly how it works but it was from MC I believe.

 

[AuthorEditor]

Interesting! Thanks for the nice cut. I'm trying to picture what the spring pushes against and what it is for and it must have something to do with the pressure relief because there is also the leaf spring in the dome end of the can that keeps the filter tight in the housing. I understand Motorcraft's argument that having the relief valve at the thread end means less gunky dirty oil flowing back into the engine when the valve is open, but I also think it is interesting that most other filter companies don't seem to care. Is there something about Fords that makes thread-end relief valves important?

 

[Sayjac]

Motorcraft has been using this design for a very long time. Wix/NG thread end bypass also uses what looks to be black/nitrile(?) material as part of their design. And never seen a silicone spec material specifically for the thread end bypass design from any brand.

But don't trust it, simple solution, switch brands.

From my non technical, non internet engineer view, looks fine to me.

 

[AuthorEditor]

Quote:
From my non technical, non internet engineer view, looks fine to me.

What! It must be a conspiracy between Ford and Motorcraft to shorten the life of their engines by allowing the pressure to build to the point the media tears! Where is your tinfoil hat?

 

[goodtimes]

It looks like the rubber seal is tight against the end cap, on a ledge, where your finger lifts it. It can't lift there. When relief pressure builds it moves the element up making a space, still keeping the adbv sealed under pressure. I think that's how they show it. The holes in the bypass must be to keep the pressure equalized.

 

[Sayjac]

Quote:
....Where is your tinfoil hat?

Not sure if you are being facetious? But that portion of my post dealt strictly with what I saw in the bypass design, which as noted looked/looks ok to me. If some correlation or connection was also being made to media tears in the post, I missed that. And thus would have no comment on it.

Based on some of the comments though it seemed most related to possible drain back caused by the design? Didn't address that either. But imo 'if' so, a much lesser issue than bypass not opening as designed.

 

[AuthorEditor]

Quote:
Not sure if you are being facetious? But that portion of my post dealt strictly with what I saw in the bypass design, which as noted looked/looks ok to me. If some correlation or connection was also being made to media tears in the post, I missed that. And thus would have no comment on it.

I was being sarcastic--your post was spot on. It seems that lately any post having anything to do with Purolator becomes a tinfoil hat festival.

 

[goodtimes]

In a pointing down arrangement then it wouldn't be good to use this Motorcraft system, like in a camry v6. The coil spring keeps the adbv pressed into place as the element moves to allow oil to bypass. That's the way it looks in their picture. Oil does not flow under the lip. It is good for a thinking exercise at least.

 

[Sayjac]

Originally Posted By: AuthorEditor
I was being sarcastic--your post was spot on. It seems that lately any post having anything to do with Purolator becomes a tinfoil hat festival.

Got it!

And I don't disagree with your conclusion/assessment and thus why I tread lightly in response. Mostly now, just try avoid it myself.

 

[goodtimes]

Maybe someone better with computers can post the image of the way MC shows the bypass valve operation in their article? Where the finger is lifting the rubber washer shown above, it apparently doesn't work that way. The flat rubber washer seals the end cap only.

 

[Nyogtha]

This Napa Gold oil filter video shows animation of the similar Wix system in action, starting at 1:50

 

[ZeeOSix]

Originally Posted By: Nyogtha
This Napa Gold oil filter video shows animation of the similar Wix system in action, starting at 1:50



I'd think the MC bypass valve works in a similar manner as shown in the video. Good video showing exactly how the NAPA base end bypass valve opens and flows.

 

[KDonkey]

Originally Posted By: AuthorEditor
I'm trying to picture what the spring pushes against and what it is for and it must have something to do with the pressure relief because there is also the leaf spring in the dome end of the can that keeps the filter tight in the housing.


This bypass valve is contained entirely within the plate that the media is glued into.

The plate has a depression that looks identical to the crimped in part I removed, except there are no holes. The spring seats in there and pushes down. It's compressed quite a bit when assembled.

The other bypass valves I have seen so far put positive pressure on the gasket all the way around the edge. I think instead of the metal spring seat/plunger having the four fingers, maybe it should cover and press against more of the nitrile disc. But what do I know?

My description sucks so click here to see a gallery of the bypass valve assembly

Dirty side oil goes into the holes, pushes up past the nitrile disc, and into the clean side.

 

[WellOiled]

And for a small leak, the filtration efficiency is reduced a little.

 

[goodtimes]

The Motorcraft literature liked before shows this picture:

In either the Napa video or this picture the outer edge of the rubber washer seal isn't lifted. It seems like it would work that way, but in the Napa video the edge of the seal is clearly captured and when the inner part of the seal moves in, the oil flows. Ford shows another way, may be it's wrong, they show the element moving up and the oil does not flow through the holes. If the picture and video are correct the bypass is not the same on Wix and Motorcraft.

 

[ZeeOSix]

^^^ I think that cross-section of the MC is messed up and not accurate. My bet is the oil goes into those holes around the outside, and pushes the spring up and unseals the rubber gasket and lets the oil flow through and into the center tube right at the base. Very similar to the NAPA design in functionality.