Operation of the Choke Circuit

Don't choke!

Don’t choke!

a. The choke circuit supplies a ready means of restricting the amount of air passing through the carburetor. This restriction and resulting rich mixture is necessary when starting and warming a cold engine.

b. Chokes are of two types; manual and automatic.  The WO Carburetors described herein employs the manual type. The manual choke mechanism  in the conventional carburetor consists of a valve mounted on shaft in the air horn of the carburetor, operated by an external lever attached to the shaft. Manual operated choke valves of this type usually have a semi-automatic feature which prevents over-choking after starting. This feature is accomplished by spring-loading, either all or half of the valve, or by incorporating a spring-loaded poppet device in the valve. Some models use both means to improve choke action.

You can find out more about the WW2 jeep inner workings with this book – The Complete WW2 Military Jeep Manual.

I watch my weight and the jeep's too.

I watch my weight and the jeep’s too.

A girl’s got to watch her figure.  And back in the day the Army was watching the weight of the jeep.

Compared to today’s Jeeps the WW2 jeep was pretty light weight.

Do you have the manuals? It’s in there. IF you don’t have them yet then look at this – General Stats.

The Willys MB and the Ford GPW made up the bulk of WW2 production in "jeeps".

The Willys MB and the Ford GPW made up the bulk of WW2 production in “jeeps”.

 Net weight – 2,453 lbs.
Visit http://www.42fordgpw.com/
173+ megabytes of jeep & related info.
I just hate it when someone torques me the wrong way. Don't you?

I just hate it when someone torques me the wrong way. Don’t you?

When you put your combat rims together you should use a torque wrench and set the bolt to 60-70 ft. lbs. But hey be sure set them ALL to the same torque reading!

 image109Combat wheels are identified by eight bolts holding together the two halves of the tire rim. When removing a tire, first remove the wheel and be sure to deflate the tire before removing the rim nuts. After removing the rim nuts, remove the outer rim nuts, remove the outer rim then remove the tire after which remove the beard locking ring and tube from the tire. Mounting the tire is the reverse procedure. Do not put too much air in the tube when mounting.
From TM 10-1513 Change No. 1, May 15, 1942. You can add to your WW2 jeep library by getting your own copy of the manual – Maintenance Manual, Willys MB: TM 10-1513.

Is Oil Viscosity a Concern?

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.

I just love that "Go-Devil" Engine! But what I really love is all the little details about the jeep--check out this book!

I just love that “Go-Devil” Engine! But what I really love is all the little details about the jeep–check out this book!

Here’s an announcement: Herbert R. Rifkind’s book “Jeep -Its Development and Procurement Under the Quartermaster Corp 1940 -1942″ is available. It is in the original manual script format. Photographs inserted were chosen to replicate the ones that Rifkind originally chose. Some were left out because I could not find the image or because the image appeared to be from a copyrighted source.

This edition contains the complete text which the 1983 and 1988 did not have. This version did not have as many pen and ink changes present as the 1983 version. I think you will find it more readable then the British (1988) version. You can find the book at on line booksellers like Amazon.com and Createspace.com–and it should be available everywhere on line. The retail price is 19.95. 228 pages (including an introduction that I added).


ISBN-10: 146370917X
ISBN-13: 978-1463709174

CreateSpace: Jeep – Its development and procurement under the Quartermaster Corps, 1940-1942

Amazon: Jeep – Its development and procurement under the Quartermaster Corps, 1940-1942

Check out John Farley's lastest jeep book!

Check out John Farley’s lastest jeep book!

John Farley has done it again. He has come out with a second version of his book on standardized WW2 jeeps 41-45. He has divided the work into Willys and Ford. He goes thru the variations for each year with large and detailed shots to illustrate his points. Very well done and like the first volume the best work to date that includes information for all the war years. The only thing missing are the pre-standardized jeeps and those have already been covered by other authors…including myself!   Well, it looks like this book is out of print.  You might be able to find it at Portrayal Press if you contact them.

Having the right tool for the job can be down right handy...do you have all of your vehicle tools?

Having the right tool for the job can be down right handy…do you have all of your vehicle tools?

a. Unless vehicle is equipped with special equipment, the following are supplied (one of each unless otherwise specified):
Thankfully you don’t have to lug around all of these tools!

Tool Federal Stock No. Where Carried

ADAPTER, lubr. gun ………………… Tool bag
APPARATUS, decontaminating,12 qt…. Driver’s compartment
Ax, chopping, single-bit ….. 41-A-1277 Body left side
BAG, tool ……………… 41-B-15 Tool compartment
CATALOG, ord. std. nom. list.. SNL-G-503 Glove compartment
CHAINS(4) , tire, 6.00 x 16 ……. 8-C-2358 Tool compartment
CONTAINER, 5-gallon …….. ………… Bracket on rear
COVER (2), headlight ……….. ………… Under right seat
COVER, windshield ………. ………… Under right seat
CRANK, starting ………… ………… Under rear seat
EXTINGUISHER, fire ……… 58-E-202 Inside cowl, left
GAGE, tire pressure ………. 8-G-615 Tool compartment
GUN, lubr., hand-type ……. 41-G-1330-60 Tool compartment
MANUAL, technical ……… TM 9-803 Glove compartment
NOZZLE, flexible tube …………………………….
OILER, straight spout, Y2-pt.. 13-0-1530 Front of dash
PUMP, tire, w/chuck ……… 8-P-5000 Behind rear seat
RIFLE ………………… ………… On dash
SHOVEL, D-handle, rd. pt….. 41-S-3170 Body, left side
TAPE, friction, roll ………. 17-T-805 Parts bag
WIRE, iron, roll …………. 22-W-650 Parts bag

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