Rear seal question

[Drewster]

Is the rear main supposed to have ribs like the front seal does?

Does victor renaz? JV742R?


Drewster on Tapatalk

 

[TURBOELKY]

If I'm not mistaken, the rear of the crank has those "ribs" built in to direct oil at the rear seal. Front does not which is probably why the seal has them, to direct oil back into the pan. I forget the actual name of those ribs.

Disclaimer:
I'm am no professional and could be totally wrong lol

 

[turbolou]

It's called a knurl & its purpose is to sling oil away from the seal. One of reasons for the rear main leak is the original machining in the block & cap were intended for a rope seal which we all know wasn't very successful either. A good part of the leaks are the factory rubber pan gaskets which are terrible. RJC or Duttwieler cork gaskets are the way to go. The Chinese steel cranks that come with a heavy knurl are also a problem because it's done improperly and the seal rides on top of the knurl so a leak is practically guarantied. Should that be the case the crank should be welded in that area and turned down back to factory specs less the knurl. Some of the later version cranks now come without a knurl & are much better for that reason. But in either case for other reasons a steel crank is the best choice .

 

[turbolou]

Is the rear main supposed to have ribs like the front seal does?

Good question, Now if the seal was knurled instead of the crank much like an early generation Small or BB chevy there would be better oil control & if it were a full circle seal better yet.

Does victor renaz? JV742R?


Drewster on Tapatalk

 

[Drewster]

Yes my crank is smooth and I thought knurl on the seal would keep the seal from drying and burning up. ( funny the knurl is shown in the instructions. Maybe an old design )

I thought it best to ask instead of assuming. Probably just enough leak-by a smooth seal to keep it moist in the long run.
Of course I will lube a tad for start up.
Thanks for the replies.



Drewster on Tapatalk

 

[TURBOELKY]

It bothers me I keep forgetting the proper name for those grooves. It's named after the dude who came up with that idea. I'll ask my machinist later so we all have aproper term for it lol.

 

[TurboTGuy]

It bothers me I keep forgetting the proper name for those grooves. It's named after the dude who came up with that idea. I'll ask my machinist later so we all have aproper term for it lol.

"Hydrodynamic" ?

 

[TURBOELKY]

I think it was named after the "Archimedes scroll/screw/swirl"... Hope I got that spelling right lol.