Do I need it?
Will Napa have it?

Thnx jon

not really necessary.

there was a debate awhile back as to whether it is an "oil slinger" (what everybody refers to it as) or if it is to help protect the front of the eng from oil leaks out the front which would inundate Ma with dealer comebacks. seal quality is light years better than way back so what Stump said, you'll be fine (assuming correct seal installation) but if you have one I would use it (& NAPA wont have it). I can get one to your front door for a ten dollar bill. that way you know you are "correct". You'll sleep better at night (as will I!).

I use them on all my motor builds, street, street and strip or race only I buy them a dozen at at time from 440 Source

I doubt Napa will have it, shouldn't be hard to find them though , I probably have an extra one .

Ive had factory with and without.Seems the later engines there were less with them.I think ever early one I tore down did have one.Not really necessary though.Rocky

And if you put one on there, DO NOT put it on backwards!

The way I look at it is its there for a reason. We can speculate all day long but we don't know for sure why it's there. With the amount of R&D that they put into their product back in the day I would say they saw a benefit to having that part along for the ride.

It is for blocking the oil from the seal. Don't believe it? Look at the rear main seal area on a crankshaft. See anything odd? There is a built in ring around the crank to block the oil going from the bearing to the seal area.

have any other reason for that being there?

That's what the factory refers to it too.

slings the oil away from the seal. Same purpose for the front slinger. Slings oil on the timing chain as well.

The active word is "slings". It doesn't just block the oil from running that way, like a dam, but as the crankshaft turns,the slinger helps any oil that comes in contact with it to fly away.

I cannot understand why this is so hard to grasp. Oil slingers are used all the time in industrial equipment. It is not a Mopar-only concept.

The reason one can leave it off is that the lip seals are pretty good these days and can handle having some oil on them.

The front oil control device that amuses me is the stationary sleeve fitted around a sort of screw thread rotating with the crankshaft. Rotation of the crank turns the thread that pushes oil back into the engine. It's not really a seal, but it does keep leakage to a minimum. It can also propel debris into the engine.

R.

Yes, it is there for a reason

No, they don't have everything

Mancini or 440Source

I remove them from all my builds. Sometimes the new seals in the timing cover actually press against the slinger and push the clearance out of the crank thrust surface on one side. We always check the crank thrust on every engine that someone else builds before and after it bolts on the dyno. Before bolting them up we have found thrust forward and the crank springs back when releasing the pressure. Each time it has been the slinger pushing against the extended seal acting like a spring shoving the crank to the back of the engine. We haven't had any leaks from tossing the slinger into the trash.

Evidently some of the new seals are different enough to make the slinger unnecessary. Good to know

the plot thickens! I am for sure gonna check that next time. thanks for the heads up!