Lower slat rad hose almost certainly is 3 part metal

[Thomas Jacobson]

re: post of last year: http://www.g503.com/forums/viewtopic.php?f=69&t=104769

I continue to wonder about this slatgrill lower hose issue... I saw another picture that has the lower hose as metal..... Caused me to look at the parts books:

TM-10-1186 July 1, 1943 says on page 64 under group 0505 that the upper (inlet) hose is the three part, consisting of 2ea. A-6373 and one each metal pipe A-6374 used only on MB (not MA). But then, for the lower (outlet) hose, it says 634512 hose used on the upper part, and A-592 hose used for the lower part, connected with bent pipe 636109, and that those parts are used on both the MA and MB!

Now, it is true that TM-10-1206 of Dec 1, 1941 says it is a one piece hose A-5164...

The fact that the lower (outlet) hose is composed of a combination of a low number A part number (A-592) and the two other parts having WO six digit part numbers... while the upper has much later A part numbers (A-63xx) suggests that these parts existed during slatgrill production.... If the lower three part hose was developed at the same time, you would think it would have had A-63xx numbers too....).

Anybody have an MA only parts book to look at (not the TM-10-1186 one of July 1, 1943) to look this up? Does it show a three part hose for the lower (outlet) hose?

More: Ah ha! I just looked at the slatgrill maintanance manual TM-10-1207 (Willys copyright 1941). Look at the lubrication chart on page 03-10 and 03-11.... look at the lower (outlet) hose, and the upper (inlet hose)... You can clearly see that the lower (outlet) hose is thee parts.... Case closed?

But wait! Theres more. I see in one of the series of factory pictures (the ones where you can see the edges of the negatives) pictures marked D-5988 (two men with hats lowering a body), D-5989 (two men no hats wearing glasses mounting an engine), and D-5990 (old guy using two hands on an electric driver to install a solid rim wheel), that D-5988 clearly shows the three part metal outlet tube and one part upper inlet tube on an engine with no PVC valve, and because of the sold wheel in D-5990, it has to be an early slatgrill.

I bet that the dominant outlet hose was a three part hose left over from the MA or other Willys vehicles, but that the intention was to go to a one piece one (oh so modern, bent rubber, less weight, etc.)... and they started mix some of them into production as available and least cost, and then the rubber shortage hit... thats why the early parts book shows the one piece one.. Hmmm. I suppose you could say that by December 41 they had changed from three part MA style to a one part, and then when the rubber shortage hit they went back to the three part? Hmm. Have to check to find a glovebox slat with a three part outlet hose...

Thomas.

PS- Interesting and unrelated: I see in TM-10-1207 on page 0500-53 they say not to use oil based paint to paint the radiator, as it acts as an insulator and prevents dissipation of the heat. I wonder if this is the reason for black lacquer.... (black "japan")


Ah ha! More data from the MA list:


Re: Any of you MA guys have an early parts book?

New postby pierino » Sat Jul 11, 2009 8:35 am
MA TM-10-1102 parts list 0505 group lists:

A-591 radiator hose, upper
630512 outlet hose, upper
A-592 outlet hos, lower
638061 hose insert (for lower hose)
636109 water outlet connecting tube
52226 hose clamp 1 13/16" dia (6each)

So, this means that the MA used a three part hose on the outlet!!

[Bad Dad]

Hi Thomas,
Douglas here, you may remember you sold me a slat speedo bezel in 2016. I was recently told that my slat should have a one piece lower hose, on looking at the same books as you I noticed the diagram on the lubrication chat, I found that reassuring, also the mention of lead paint.
Best,
D.

[Mark]

I have wondered about the accuracy of the TM manuals related to their issue date. For example, TM-10-1207 issued Dec. 1, 1941 also shows on the lubrication chart on pages 03-10 & 03-11 the later (standard) style rear brake line routing. If this TM was actually issued Dec 1, 1941, shouldn't it show the early slat rear brake line? This is similar to the radiator hose in the illustration which clearly shows the 3-piece lower hose which is also typical on later jeeps. My copy of TM-10-1207 is a reprint (repro) so I am not sure if these illustrations are the same as in an original copy...

[Ladislav]

MA used 3 pcs. lower hose (1x steel elbow + 2x short rubber hose). The top hose is one pcs. (1x long rubber hose).
Lad.

[Thomas Jacobson]

Found another nice picture of thee part on bottom, single on top. See: Lloyd White Vol 4 page 26. Picture is dated Aug 21, 42. Unlikely that the hoses would have been changed since production by that date.
T.

PS- Also picture looks to show correct tools for a slat, looks like early rounded, not pear shaped...