Oil or grease in front hubs

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
dpcd67
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Re: Oil or grease in front hubs

Post by dpcd67 » Mon Apr 15, 2019 8:09 pm

I see I need to be clear on what I do and be assured, it works because I have been doing the same thing for over 40 years on many different vehicles. At least a dozen.
I do not use any type of oil in my front knuckles. That is a misguided direction from some bottom of the class automotive engineer at Willys.
I used GAA until about 5 years ago, and now I use only a modern moly based, equivalent, on the U joint, whether Bendix, Rzeppa, or Tracta whch most Dodges have.
I Do Not half fill the knuckle with grease. That is another misguided recommendation as it serves no purpose. It is clearly established that the grease does not do anything but sit there. And the grease on and in the U joint does not "fling off". Why waste grease?
In this case, I have chosen to ignore the TM guidance which I well know; I study my TMs every day; and have proven it works.
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Re: Oil or grease in front hubs

Post by Joe Gopan » Tue Apr 16, 2019 1:55 am

Am positive my old Army Instructors would still be proud.of me.
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HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
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irakli
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Re: Oil or grease in front hubs

Post by irakli » Wed Apr 17, 2019 8:42 am

dpcd67 wrote:
Mon Apr 15, 2019 8:09 pm
I see I need to be clear on what I do and be assured, it works because I have been doing the same thing for over 40 years on many different vehicles. At least a dozen.
I do not use any type of oil in my front knuckles. That is a misguided direction from some bottom of the class automotive engineer at Willys.
I used GAA until about 5 years ago, and now I use only a modern moly based, equivalent, on the U joint, whether Bendix, Rzeppa, or Tracta whch most Dodges have.
I Do Not half fill the knuckle with grease. That is another misguided recommendation as it serves no purpose. It is clearly established that the grease does not do anything but sit there. And the grease on and in the U joint does not "fling off". Why waste grease?
In this case, I have chosen to ignore the TM guidance which I well know; I study my TMs every day; and have proven it works.
Filling knuckles with grease was not only recommended by Dana, Willys. etc. engineers, it was recommended by Stayer Puch in Gratz, Austria in 70s when they designed Mercedes G-class. So this cannot be called as outdated recommendation. Without grease a knuckle ball will be deffinitly subject to corrosion. Painting them as suggested by dpcd67 is elegant solution against corrosion but may not cure all issues.

Recently I finished rebuilding of my axles and noticed that with grease applied to the ball, knuckle turns with much less effort. It means lighter steering wheel, unless it is specific to only my Jeep which I doubt. Another possible negative consequence could be dry friction of the knuckle seals on painted surface, resulting fast wear of seals. I have felt seals, rubber seals could last longer. I have 140 oil on my Volvo Laplander knuckles (as per the manual) but it is hold tight by rubber boots, which is missing on Jeep. I know all you like photos of Jeep parts (so do I), so I will upload one.
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dpcd67
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Re: Oil or grease in front hubs

Post by dpcd67 » Wed Apr 17, 2019 9:10 am

No your seals won't wear out if you paint the knuckle balls. What will wear them out is rust and pitting. I do it all the time because the balls are not smooth.
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Re: Oil or grease in front hubs

Post by Joe Gopan » Wed Apr 17, 2019 9:38 am

This question has existed since the beginning of Jeep history, especially since Civilians started purching hm. The existance of the pipe plugs on the knuckles makes some think Gear Oil. Many PM minded Jeep owners of the past had a favorite local gas station they frequented that had a Jeep familiar attendent in the lube bay. (I was one of those attendents).
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
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Re: Oil or grease in front hubs

Post by ErikMax » Mon Jun 29, 2020 8:28 am

If you use grease How much in each ?

dpcd67
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Re: Oil or grease in front hubs

Post by dpcd67 » Mon Jun 29, 2020 9:54 am

I pack the U joints like wheel bearings and smear a thin coat of grease on the inside of the knuckle to prevent rust. Trust me, it won't sling off.
Those who insist on packing the knuckle full of grease are just wasting grease and those who think oil goes in there are sadly mistaken and are in for a garage full of oil.
And I no longer use GAA; we have come a long way since then; I use modern Moly wheel bearing grease. On all my Jeeps and Dodges.
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Re: Oil or grease in front hubs

Post by Joe Gopan » Mon Jun 29, 2020 10:11 am

I still prefer the Army way, it will cause no lubrication problems if the TM and LO are followed. Many do not realize this, but by following the LO when doing scheduled PM on the steering knuckles, you are also cleaning and inspecting the moving parts for wear and damage and finishing up the task by adjusting the preload on the trunion bearings.
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HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
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Re: Oil or grease in front hubs

Post by jnissen » Tue Jun 30, 2020 2:31 pm

What I used. Image


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Re: Oil or grease in front hubs

Post by dinof » Tue Jun 30, 2020 4:02 pm

Do not ever pour any "Oil" into the housings. Mine is still dripping from 2014. Don't do it!
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Re: Oil or grease in front hubs

Post by brad m. » Tue Jun 30, 2020 6:01 pm

I’m at this stage myself of needing to decide on Knuckle lube. I have a gallon of Army surplus GAA grease which looks fine, but it’s dated 1995. Does grease go bad & can I mix gl1 90 w Gear lube with it, to make a pudding?

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Re: Oil or grease in front hubs

Post by jnissen » Tue Jun 30, 2020 6:15 pm

I would not trust it. Lubriplate makes a modern equivalent and I’ve never had drips out of the knuckles. It’s a big enough PIA doing a knuckle rebuild I’d not trust an old or questionable lube.
Jim Nissen
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Re: Oil or grease in front hubs

Post by Joe Gopan » Tue Jun 30, 2020 7:10 pm

Lubriplate makes fine products intended for specific applications, GAA meets the Military Specification for this particular application.
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HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
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Rob G.
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Re: Oil or grease in front hubs

Post by Rob G. » Tue Jun 30, 2020 9:12 pm

I have been quite pleased with this as a solution to the steering knuckle lubrication conundrum, "NLGI grade 0"
1 tube per knuckle.

https://www.amazon.com/John-Deere-Corn- ... den&sr=1-3

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Rob ...... Keep Jeepin'
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Re: Oil or grease in front hubs

Post by Joe Gopan » Wed Jul 01, 2020 5:44 am

Do a search on G503, I remember a few years back a gentleman with a M-38 nearly frying his gearboxes on Corn Head.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO

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