Masters of the obvious,
I can't say for sure what happened at IH8Mud but Frank has put a great deal time and effort into Toyota (and other) solid front axles of the Birfield design. The aftermarket has limited knowledge and access to the magic, mystery grease type the factory uses (a long strand lighter than #2 grease).
Why is it a big deal? Because the 'original build' seems to run 15years, 100k-150k just fine (or some REALLY long time). After that all the Birfield guys have to redo the grease every couple of years and far less miles. He's worked/working to make people aware of how important and how much money they can save with the correct grease type (and how to get it).
Frank's company*, Cruiser Outfitters, does a lot of work with the older Toyo axles in the LC's, 1st gen 4Runners and some SAS's.
Search his username, it's quite an education in grease
:cheers:
* I am unclear if he works/worked there, owns Cruiser Outfitters or what... "Frank's company" may have been a misleading way to make the point.
Okay,
I sent CJ3flyer some info on this a while back, has a good understanding of the situation and that is very simple,
Factory build goes for years, open it up and your into every couple of years ,,
While I do not know CJ3 flyer from Adam I figer by his user name , into Jeeps and airplanes, just a guess thou,
Anyway there are a few "Masters of the Obvious" I have found , a very small %
Here is a excellent post From "Red",,, a Ol Jeeper guy,,
Red
Posted: Mar 27 2011, 12:02 AM
Report Post
Member
Group: Members
Posts: 21
Member No.: 1,014
Joined: 20-January 11
This subject has reached the level of inflamed and passionate opinion on other sites. Views vary according to, well, they're all over the place. But here's what I've done with mine:
I have an M38A1. I post here on this site because it has a uniquely sensible approach to old jeeps and because so many of the systems on A1s and 3Bs are similar. My jeep has a dana 25 front end with Bendix axle shafts. The military manual states to use #0 grease in the steering knuckle. This is essentially 2 levels lower viscosity than the typical #2 we all use for u-joints, steering, etc. Many if not most owners also use the #2 in the knuckle and I figure that should work fine if lube intervals are maintained, as the greases these days are uniformly superior to anything the manual writers had available in '54 (DOD of my A1).
But I prefer the #0 for several reasons. First it's what the manual calls for. Second, it does not create what I think is called a "tunnel effect", where the #2 grease gets thrown against the wall of the knuckle and stays there and eventually deprives the axle shaft of grease. The #0 being less viscuous is thrown around the knuckle when the shaft turns (either in 4x4 mode or all the time if you are running a rig without lock out hubs) but returns to the axle shaft and keeps it largely immersed in the grease at all times (therefore, no tunnel effect). By the way, I observed this "tunnel effect" in my A1 when I did the initial clean up and greasing not long after bringing it home. Not only was the grease not doing the axle shaft any good, there was no way it could have been lubing the top kingpin bearing either. Which brings me to the third reason I use the #0: when the axle shaft turns it throws the #0 all over the knuckle and serves to grease the top kingpin bearing as well. This won't happen with #2 grease- it's just too thick to move that way and it's not supposed to be thrown off like that anyhow- it's supposed to stick.
Now many use the 140 weight and I can't say how that works. There is nothing better than immersion in oil for lubrication and if you can keep it from going past the seals, that would be the way to go. My concern there would be the loss of oil and questionable lubing of the top kingpin bearing. Also, there's the chance it could migrate towards the differential, though I can't say if that's a problem.
I also consider the intent of the designers of the dana axles. The fill plug is large enough for a grease gun to fit in to it. It's at mid height on the knuckle, meaning that is the correct fill level. This alone indicates to me that the original intent was to have a more fluid grease in the knuckle than #2 grease, for #2 doesnt settle as an oil or #0 does. Another design characteristic of the dana knuckles, which I believe is underappreciated, is that they are supposed to allow a certain amount of grease past the knuckle seals. If the grease is of a viscosity that will properly lube the bendix joint and the top kingpin bearing, then it will be lost past the seal to a certain point. It might be nice to have a clean axle housing, but it might also mean that the grease is so thick that it isn't doing its job inside the knuckle.
I use what's called "cornhead grease" It's a John Deere grease they use in combine type gearboxes ( called corn heads). it's a thixotropic grease meaning it won't leak out and adheres to moving parts, yet returns to level (as would an oil) when at rest. So far I haven't had any problems. The kingpin bearings are all new, and I keep a eye on them as well. Sounds odd, I know, but I did not feel that #2 grease was doing the proper job in the knuckle, so I went looking for the grease the manual called for. #0 isn't easy to find in small quantities (I had one outfit say I had to buy it in 5 gal buckets minimum, another place said minimum was a pallet!).
One other thing; I originally found out about this grease while researching for something to put in to a Ross steering box I thought was leaking. Turns out the leak was not from the Ross, but the research turned up the interesting fact that cornhead grease is used by old car guys in leaking steering boxes because it has the proper qualities of a 90 wt in a steering box and yet will not leak out. We are fortunate to have a pretty big aftermarket industry supplying repro and rebuilt parts and systems for jeeps. But some of these old car and truck guys don't have that for obscure and small population vehicles and with no aftermarket available, they make do with what they have. In the case of steering boxes, if one leaks, they often just have to keep it going and they overcome the problem with ideas such as using the #0 grease.