IMS center bolt

[elgyqc]

Originally Posted by piper6909

Wouldn't the oil flow from the inside outward? Keeping the inner seal in blocks the oil flow. Maybe not completely, but it surely restricts it.

The inner seal side of the bearing is in the IM shaft, so the only oil on that side is oil that has passed through the bearing and is trapped in the shaft. The good stuff is on the outside.
The PCA videos with Jake Raby explain in detail what is happening with the IMSB.

[WhiteyII]

So a couple questions, the really crappy oil that comes out when the bearing is pulled is there because of the inner seal causing stagnation or in other words because the inner seal doesn’t allow the oil to flow thru the bearing? Does the Retrofit LN bearing have an inner seal or does it let the oil flow thru or rely on immersion and splash?
I appreciate you guys and your knowledge.........

[Homeoboxter]

Originally Posted by WhiteyII

So a couple questions, the really crappy oil that comes out when the bearing is pulled is there because of the inner seal causing stagnation or in other words because the inner seal doesn’t allow the oil to flow thru the bearing? Does the Retrofit LN bearing have an inner seal or does it let the oil flow thru or rely on immersion and splash?
I appreciate you guys and your knowledge.........

The original bearing is sealed with grease filled inside. IMS is a tube with about a liter of air trapped inside, since both ends are closed. When the engine warms up, pressure rises within IMS, and after a while air will leak through the bearing`s seals, creating vacuum when the engine cools down and the pressure drops. Eventually this will cause the oil to seep into the IMS, and will fill it, since the entire shaft is submerged in oil. Since it does not circulate so well, and you can`t drain it when replacing engine oil, it will become darker and crappy than the rest of the oil in your engine. So, if you just remove the outer seal, the bearing will get sufficient lubrication from outside. Somewhat depending on the oil level in your crankcase, it will get direct oil from being submerged, from splash, plus oil mist.

As far as I know the retrofit has no seals.

[WhiteyII]

Thank you Homeoboxster, to my surprise the retro kit showed up today and it has one seal, the inner. As of now I think I’m going to inspect in place removing the outer seal, if I have any doubts I’ll replace. I’m having no luck finding the m8 x 1.0 coupling nut for the puller. I contacted LN for a source and was told that they are going to start loaning tooling (2021) for free with purchase from them. I bought from Amazon so as far as tooling I’m SOL but the kit was $200 less expensive and according to Amazon returnable thru 1/31.
Thanks for the help and loan of your knowledge.

[elgyqc]

Originally Posted by WhiteyII

... As of now I think I’m going to inspect in place removing the outer seal, if I have any doubts I’ll replace. I’m having no luck finding the m8 x 1.0 coupling nut for the puller.

A wise course to take IMHO. If eventually you do want to change the bearing see the videos on Youtube by Ben Burner. He made or improvised all the tools necessary, for almost nothing.
https://www.youtube.com/watch?v=UJ5WwbgQejs
From there you can link to his complete series of IMS bearing replacement videos.

[mikefocke]

Tool kits are often offer in for sale forums.

[WhiteyII]

Thanks Mike, I got the puller/tools figured out, bought the correct tap and drill bit from Amazon delivered next day. Bought a 1/4” coupling nut, drilled and rethreaded to m8x1.0, same for the puller rod..... and red loctited matching bolt in the rod.I’ll let you know

[Homeoboxter]

Originally Posted by WhiteyII

Thanks Mike, I got the puller/tools figured out, bought the correct tap and drill bit from Amazon delivered next day. Bought a 1/4” coupling nut, drilled and rethreaded to m8x1.0, same for the puller rod..... and red loctited matching bolt in the rod.I’ll let you know

Just now that you spent so much time and effort on making a tool don`t feel obligated to use it