Is Oil Viscosity a Concern?

If you’re not then maybe you should be!
Film thickness. Simplified equations have been developed to provide approximations of film thickness with a considerable degree of precision. Regardless of how film thickness is calculated, it is a function of viscosity, velocity, and load. As viscosity or velocity increases, the film thickness increases. When these two variables decrease, the film thickness also decreases. Film thickness varies inversely with the load; as the load increases, film thickness decreases. Viscosity, velocity, and operating temperature are also interrelated. If the oil viscosity is increased the operating temperature will increase, and this, in turn, has a tendency to reduce viscosity. Thus, an increase in viscosity tends to neutralize itself somewhat. Velocity increases also cause temperature increases that subsequently result in viscosity reduction. From EM 1110-2-1424 28 Feb 99.
Worried about viscosity?

Worried about viscosity?

Increased viscosity leads to increased operating temperature which is not good for either your engine or your transmission (or other mechanicals). That’s why it is best to use the viscosity recommended by the original manufacturers. For example for the L-134 engine use 10 weight in the winter and 30 weight during the summer…or using modern oils you might consider using 10w30. For the transmission, transfer case and differentials use 90 weight during the summer and 80 weight during the winter.

You might be interested in Military Maintenance for MB/GPW Jeeps 1941-45 which has a lot of WW2 jeep or period related topics that might be helpful to you in learning all about the jeep.


Are going to bleed? …brakes that is…

Bleeding Brakes.
(1) Remove cap screw from bleeder connection, and thread bleeder drain hose into this opening. Allow bleeder hose to hang in a clean container.
(2) Care must be taken not to drain the master cylinder reservoir during this operation; otherwise, air will enter and make rebleeding necessary. The reservoir must be full during the bleeding operation.
(3) Loosen bleeder screw one full turn, and depress the brake pedal slowly; then, allow the pedal to return to the “OFF” position. Repeat this operation approximately 10 times, to provide a pumping action to force fluid through the line, and expel all air. This operation must be repeated at all four wheels to bleed the entire system.
(4) Watch flow from bleeder hose, keeping hose submerged in fluid in the container. When air bubbles cease to appear, or when the stream is a clean, solid mass, close bleeder connection.CAUTION: Fluid withdrawn during the bleeding operation should not be used again.
It’s a good idea to get the manual that goes with the WW2 in order to understand how it works or should work.   You can get a copy of The Complete WW2 Military Jeep Manual (Brookland Military Vehicles) from
Hey, if I can do it, you can do it!  Get the book!

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Here’s a good friend of mine, Mac, having way too much fun with his replica 37mm Anti-Tank Gun.

Mac’s a great machinist!

You can see more about Mac’s gun by reading Until The Guns Come Off The Line. The story starts off with a Capt Johnson in 1940 who didn’t have enough real guns to train his troops…so he built his own! He made the training guns from surplus Dodge’s and other vehicles. Part two of the story picks up with Mac deciding to build his own. Check it out.

I watch my weight and the jeep's too.

The Navy had jeeps that were used by the USMC.

The USMC is, of course, a part of the USN.  During WW2 USN jeeps were used by the USMC.  It is really cool seeing a color photograph of the jeep in action.

usn_jeepA USN marked jeep being used by the USMC to tow a Marine glider. While this jeep isn’t proof of how all USN jeeps looked during WW2, it certainly is interesting and might serve to stir some discussion. The original caption for this photo was “Marine glider at Page Field, Parris Island, S.C.”. It was taken in May 1942 at Parris Island and is from the Library of Congress collection.
Come home safe!

Come home safe!

Army Jill salutes the troops wherever they may be.  She hopes that all of them will have a successful tour and that they will be able to come home safe.

Is it a parking brake or emergency brake?

Do you need to do routine maintenance on your WW2 jeep?


Did you just recently buy a WW2 jeep?  Or if you are interested in getting one, you really need the manuals.  The first manual to get is the TM 9-803.  It will have much of what you will need to know.  If you don’t have TM 9-803 it’s a good idea to get this manual right away – TM 9-803 Willys-Overland MB and Ford Model GPW Jeep Technical Manual.  It will answer many of your questions.

Other manuals will be helpful if and more likely when you need to tear into your “new” jeep.  Those include the TM 9-1803A and TM 9-1803B which cover the engine and powertrain equipment.