#8 nose bearing

[carrerarsr65]

any sealant around the bearing when putting cases back together? thanks guys

[Flat6pac]

Just the new rubber seal, and make sure you get it on the locator pin.
Bruce

[Walt Fricke]

I run a bead of sealant on the case machined sealing surface outside of where the O ring goes. Belt and suspenders in case oil gets by the O ring somehow. Sometimes a little of that ends up in the ring groove in the bearing, but no harm to that. It does require that you lift the crank up to get at one side, so (at least with the orange stuff or other anaerobic sealants) you have to move right on to installing the left case half and tightening things down.

[Eagledriver]

This area of the case is the most difficult IMO. I've seen "tips" to use a bigger o-ring here on some engines. That tip caused me problems. The bigger o-ring pinched into the case halves and I had to do it over again with the proper ring. Another problem I've had was using silicon grease on the ring. Some of the grease got between the case halves and displaced the case sealant, causing a leak. I still use silicon grease there but keep it away from the part of the o-ring that is near the case seam. Watch this area as you mate the case halves to be sure the o-ring doesn't pinch out.

-Andy

[Henry Schmidt]

Over the years this area has been problematic. We resisted gluing the area for 20 years and have come to the conclusion that gluing is the only guaranteed solution.
It turns out that most of the cases we encounter are out of round at the number 8 main. I've measured .015" out of round. This problem is not restricted to mag cases only although the problem seems to be more prominent in these engines. The leaks are caused by oil transitioning from the case to the bearing which overpowers the o-ring and the leak occurs.
We use a thin layer of ThreeBond 1211 in the entire saddle. So thin that you can see through it. This glue reduces the possibility of oil leaking from this joint. The factory knew this joint leaks and their cure was to divert the pressurized oil by way a groove cut in the bearing. As we all know, this sometimes is not enough.

[IXjamesXI]

This is a nice picture.. I am going to refer to it when I seal my case using my supertec kit. What happens to the loctite that might squeeze out into the through bolt oil passages? Or do I not spread it close enough to those holes that it would squeeze into them.

[Eagledriver]

Originally Posted by IXjamesXI

This is a nice picture.. I am going to refer to it when I seal my case using my supertec kit. What happens to the loctite that might squeeze out into the through bolt oil passages? Or do I not spread it close enough to those holes that it would squeeze into them.

It travels to the cam spraybars and clogs them. Doesn't seem to happen to Henry, he seems to have just the right amount and distance from the holes.

-Andy

[Henry Schmidt]

I have never seen 574 clog a squirter or spray bar. Of course anything is possible.

[Eagledriver]

I bought an engine that was in boxes. It had been "rebuilt" by someone who got 574 in the oil passages. The reason it was in boxes is because it needed to be rebuilt again because some of the 574 had clogged the spray bars and 2 rockers/cam lobes were worn down. I can't say for sure where the 574 had originated but there was cured 574 in the through bolt holes.

-Andy

[lindy 911]

That's odd Andy; I had my cases together for almost two months when I discovered a nose bearing leak and had to split again. I used 574 on the webs and the perimeter. Wherever there wasn't contact, the 574 was still soft and in most areas the oil had washed squeeze out on the interior of the case completely away. I thought that 574 wouldn't set up unless compressed. Maybe I'm mistaken.

[Eagledriver]

Originally Posted by lindy 911

That's odd Andy; I had my cases together for almost two months when I discovered a nose bearing leak and had to split again. I used 574 on the webs and the perimeter. Wherever there wasn't contact, the 574 was still soft and in most areas the oil had washed squeeze out on the interior of the case completely away. I thought that 574 wouldn't set up unless compressed. Maybe I'm mistaken.

The 574 stays wet until deprived of air. It's called an anaerobic sealant. No doubt the sealant in my engine was still liquid until filled with oil.

-Andy

[lindy 911]

So I guess coating the 574 with oil causes it to cure? Maybe mine wasn't together long enough for that to happen. Who knows?

[Henry Schmidt]

Originally Posted by Eagledriver

It travels to the cam spraybars and clogs them. Doesn't seem to happen to Henry, he seems to have just the right amount and distance from the holes.

-Andy

If the 574 is isolated (only used) on the main webs (supposedly contaminating the oil supply?) how would the 574 get from the through bolt holes (which only supplies oil to the main bearings, rod bearings and piston squirters) get to the cam spray bar?

This is not a criticism just a question.

[tocobill]

Henry ... Does Shufflepinning the case alleviate the need to 574 the webs or is it to seal the main bearings, rods,and squirters from leaking back into the sump from the through bolt holes? I can remember if I have seen anyone 574 a shuffle pinned case.

[Henry Schmidt]

I use 574 on the main webs to reduce shuffling. With pins, 574 becomes redundant. If your case is shuffle pinned, 574 will make the very difficult to separate.

[Eagledriver]

Originally Posted by Henry Schmidt

If the 574 is isolated (only used) on the main webs (supposedly contaminating the oil supply?) how would the 574 get from the through bolt holes (which only supplies oil to the main bearings, rod bearings and piston squirters) get to the cam spray bar?

This is not a criticism just a question.

The squirters get oil though lines connected to the top of the main galley. It does seem unlikely that the oil would flow from the bolt holes back up into the main galley. Maybe the locktite I had in my spray bar came from somewhere in the case seam where the case halves meet.

-Andy