What do you use to seal the gaskets?

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
92889
G-Sergeant
G-Sergeant
Posts: 41
Joined: Wed Jan 20, 2016 2:27 pm
Location:

What do you use to seal the gaskets?

Post by 92889 » Wed Nov 02, 2016 9:32 am

OK,

So its almost time to put the rear axle back together. I got paper gaskets from RF for the differential cover and the hubs.
They are really thin so I dont think they will create a complete seal if there are any imperfections on my mating surfaces.
I watched a few videos on how best to seal up the diff cover. Its about 50/50 where some say gasket only and others say use a bit of RTV first or silicon. Others say to forget the gasket and just use the RTV.

What is the best way to seal these up?

Thanks

Jon the newbie.


User avatar
dpcd67
G-General
G-General
Posts: 11813
Joined: Mon Jul 25, 2011 3:41 pm
Location: Iowa

Re: What do you use to seal the gaskets?

Post by dpcd67 » Wed Nov 02, 2016 9:43 am

I use Permatex #2 non hardening for everything. Not head gaskets.
U. S. Army 28 years.
Armor Branch

92889
G-Sergeant
G-Sergeant
Posts: 41
Joined: Wed Jan 20, 2016 2:27 pm
Location:

Re: What do you use to seal the gaskets?

Post by 92889 » Wed Nov 02, 2016 9:46 am

Permatex alone or with the paper gasket as well?

Thanks


I found this online and it has made the most sense to me so far.... but what do I know?


1 clean surfaces with brake cleaner
2 apply two beads of rtv around both the cover and housing. one around the outside of bolts and one around the inside. circle all bolt holes as well and make all beads about 1/8" to 3/16" wide
3 put the cover on and snug it down until rtv just starts coming out of the seam, stop tightening
4 let the rtv dry for about one hour if temperatures outside are at least 70 degrees. If its much cooler like in the 50s, your time will be longer
5 torque the bolts
6 let cure 24 hours before adding oil

Joe Gopan
Jeep Heaven
Posts: 49841
Joined: Sun Mar 02, 2008 12:37 pm
Location: Proving Ground

Re: What do you use to seal the gaskets?

Post by Joe Gopan » Wed Nov 02, 2016 10:11 am

Use Permatex #2 or Permatex #3 on bolt threads that go through the housings, like differential bearing cap bolts. #2 is very good, #3 is almost as good, both are correct.
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

User avatar
tamnalan
G-Lieutenant General
G-Lieutenant General
Posts: 6310
Joined: Sat Feb 02, 2008 9:58 am
Location: SW Oregon
Contact:

Re: What do you use to seal the gaskets?

Post by tamnalan » Wed Nov 02, 2016 10:27 am

I'm a fan of Permatex #2 also and use it almost everywhere except the engine head gasket and engine manifold gasket. I use copper spray for them. Like Ben says, if used on bolt threads, then the permatex will prevent oil weeping past the threads. It will clean up pretty easily with brake cleaner.
Alan W. Johnson
_______________
MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939

rjbeamer
G-Colonel
G-Colonel
Posts: 1406
Joined: Mon Jul 06, 2009 4:55 pm
Location: Oakdale Ca

Re: What do you use to seal the gaskets?

Post by rjbeamer » Wed Nov 02, 2016 11:06 am

92889 to answer your question, when using Permatex #1 or 2 use your paper gasket also. If using RTV some people don't use a paper gasket.

Roger

92889
G-Sergeant
G-Sergeant
Posts: 41
Joined: Wed Jan 20, 2016 2:27 pm
Location:

Re: What do you use to seal the gaskets?

Post by 92889 » Wed Nov 02, 2016 11:21 am

Do you coat both sides with permeated or one surface (either cover or diff housing) then gasket?

Thank you

rjbeamer
G-Colonel
G-Colonel
Posts: 1406
Joined: Mon Jul 06, 2009 4:55 pm
Location: Oakdale Ca

Re: What do you use to seal the gaskets?

Post by rjbeamer » Wed Nov 02, 2016 11:45 am

Both sides of the gasket.

Roger

Marty, SoCal
G-Lieutenant General
G-Lieutenant General
Posts: 6319
Joined: Thu Mar 09, 2006 10:34 am
Location:

Re: What do you use to seal the gaskets?

Post by Marty, SoCal » Wed Nov 02, 2016 1:51 pm

If you use RTV, make sure it is the gear oil safe type. Locktite #5699 or Permatex #81182 or Mopar/Ford/GM equivealent. Works better than gaskets in most instances.
43 Ford GPW 92098
53 Dunbar Kapple M100
Sold: 61 CJ-5, 41 T207 WC-1 Dodge closed cab pickup
MVPA #8266
USMC Tanker (1811, 1812), 85-93
ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license

User avatar
dpcd67
G-General
G-General
Posts: 11813
Joined: Mon Jul 25, 2011 3:41 pm
Location: Iowa

Re: What do you use to seal the gaskets?

Post by dpcd67 » Wed Nov 02, 2016 4:29 pm

My fingers are still black from todays gasket installs; (on a 230) and no, I don't wear rubber gloves. They take away from the tactile experience of engine building. Like other rubber applications, they detract from the overall experience.
Yes, Permatex on both sides of the paper gasket and on the bolt threads. Like on head studs, on the threads into the block, obviously.
U. S. Army 28 years.
Armor Branch

Joe Gopan
Jeep Heaven
Posts: 49841
Joined: Sun Mar 02, 2008 12:37 pm
Location: Proving Ground

Re: What do you use to seal the gaskets?

Post by Joe Gopan » Wed Nov 02, 2016 4:33 pm

And Permatex #2 and Permatex #3 is still being manufactured and after more than 80 years is still just as effective as it has always been.
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

User avatar
dpcd67
G-General
G-General
Posts: 11813
Joined: Mon Jul 25, 2011 3:41 pm
Location: Iowa

Re: What do you use to seal the gaskets?

Post by dpcd67 » Wed Nov 02, 2016 4:42 pm

Wow, I didn't know it was that old, but that is the only sealer I ever heard of for over 50 years. I always thought "permatex" was the only gasket sealer made. Never bothered to check anything else. It works, and smells good.
U. S. Army 28 years.
Armor Branch

Joe Gopan
Jeep Heaven
Posts: 49841
Joined: Sun Mar 02, 2008 12:37 pm
Location: Proving Ground

Re: What do you use to seal the gaskets?

Post by Joe Gopan » Wed Nov 02, 2016 4:50 pm

It was known as Permatex Aviation Form a Gasket thru at least the 60's. I have gotten a lot of it on my fingers over the years.
Do a web search for Permatex Form A Gasket History. It's still an old stand by that works.
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

92889
G-Sergeant
G-Sergeant
Posts: 41
Joined: Wed Jan 20, 2016 2:27 pm
Location:

Re: What do you use to seal the gaskets?

Post by 92889 » Wed Nov 02, 2016 4:54 pm

Great info.

Thank you gentlemen.

Jon

92889
G-Sergeant
G-Sergeant
Posts: 41
Joined: Wed Jan 20, 2016 2:27 pm
Location:

Re: What do you use to seal the gaskets?

Post by 92889 » Thu Nov 03, 2016 8:09 am

One more question please.

What oil do I use for the differential? The TM manual says HYPOID and the diff cover says USE HYPOID OIL only. When I went to buy it they asked me what weight and offered me a product called HYPO-80.

What do you use?

I'm near Vancouver BC if that helps, (Same climate as Seattle).

Thanks again

Jon


Post Reply

Return to “MB GPW Technical Knowledge Base”

Who is online

Users browsing this forum: 19GPW43, mellor, Six Volt and 68 guests