1943 GPW 108175

If you have an unrestored WWII jeep, we would like to see pictures, and hear your comments. NO EBAY or COMMERCIAL SALES.
semberae
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Re: 1943 GPW 108175

Post by semberae » Wed Jan 03, 2018 2:59 pm

Be careful with the wood stove in your garage. Gas vapors from your vehicles and cleaning solvents and fire from the wood stove can make an explosive combination. Be safe when you use it.đź‘Ś

twinflyer17
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Re: 1943 GPW 108175

Post by twinflyer17 » Wed Jan 03, 2018 3:34 pm

Thanks for the heads up. That'd be a hell of a way to go...I'll certainly be safe with it!
Sean

GPW 108175 viewtopic.php?f=96&t=267732
DOD 4/14/43 Louisville, KY USA20371070

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twinflyer17
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Re: 1943 GPW 108175

Post by twinflyer17 » Wed Jan 10, 2018 8:02 am

Well, finally have a first jeep related project in the new house. I tried to drain the radiator for an antifreeze change last weekend, since it's been in the low 20s here for the last two weeks during the day, and close to 0 at night. The valve was a bit tight, though, and ended up springing a leak. Long story short, it eventually broke off completely. It's an original GPW radiator, so this is actually my perfect excuse to remove it and potentially try a rebuild, as I've been running a bit hot the last two summers and I'm guessing it's partially due to low flow through. I stumbled across a fantastic thread by Lew Ladwig a couple of months ago (http://g503.com/forums/viewtopic.php?f=4&t=139530), which I'm planning to use as my guide whenever I decide to dive into the project. In the meantime, though, I picked up a repro MB radiator which will keep the pressure off me from completing the original rebuild as winter ends and spring nears :wink:

Image

I also need to get a few more lights hung in the new garage, as it's awfully difficult to see when the sun goes down...
Sean

GPW 108175 viewtopic.php?f=96&t=267732
DOD 4/14/43 Louisville, KY USA20371070

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Chuck Lutz
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Re: 1943 GPW 108175

Post by Chuck Lutz » Wed Jan 10, 2018 10:48 am

Sean....before tearing your radiator apart, try back flushing it under the pressure of your water hose to see if you can dislodge stuff sitting on top of the tubes in the core. Do it on a clean driveway to see any crud that comes out of there. Sometimes that is all that is needed to improve flow and make the radiator more efficient.

Remember....easiest, cheapest, fastest should come before tearing anything apart....Sometimes rodding out the core will do more damage to the tubes and render even more of them candidates for just soldering-up to stop them from leaking. Add to that, it is a world of joy to get the core, the top tank and the surrounding frame all soldered together without leaking...

Most shops will just tell you it needs to be replaced (core) anyway and how wold you know? Doing it yourself is possible as Lew has done but it isn't a simple task to tear it apart, rod-out each tube, reassemble and insure it does not leak.....even for radiator shops!

You might find some blue or black gasket spooge or some dislodged scum from the block has now gotten stuck in the tubes and back-flushing will blow it out of there....if you are lucky...takes a little bit of time and no money!
Chuck Lutz

GPW 17963 4/24/42 Chester, PA. USA 20113473 (USA est./Tom W.)
GPW 108552 4/17/43 Louisville, KY. USA 20371278 (DOD est./Tom W.)
Bantam T3 4582 10/29/42 USA 0173499 (est.)

twinflyer17
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Re: 1943 GPW 108175

Post by twinflyer17 » Wed Jan 10, 2018 12:12 pm

Thanks, Chuck. And yep, I actually back flushed the rad last summer and was able to get quite a bit of crud out of it, but it didn't help my cooling issues and still seemed to be flowing very slowly. All the items you mentioned are partly why I decided to buy a repro rad, so that I can take my time triaging the situation to make sure I don't over do it. Either way, the drain valve broke off and there was a pretty bad looking repair previously done on the bottom tank outlet pipe, so I'll be doing some soldering anyway :wink:
Sean

GPW 108175 viewtopic.php?f=96&t=267732
DOD 4/14/43 Louisville, KY USA20371070

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Chuck Lutz
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Re: 1943 GPW 108175

Post by Chuck Lutz » Thu Jan 11, 2018 10:15 am

As long as your thermostat has been cleared of any complicity in the cooling issue, if you have back flushed the rad. and it still flows SLOWLY then rodding out the core is the next step.

However...if the local rad. shop has a hot tank and you can get it in there for maybe 4-6 hours and THEN back flush it you may dislodge some viscous goo and get better flow....

I did the flow test on the MB rad. I have and it flunked...but a hot tanking and back flushing solved that problem perfectly...worth a couple bucks to see if that will remove enough crud to get proper flow.
Chuck Lutz

GPW 17963 4/24/42 Chester, PA. USA 20113473 (USA est./Tom W.)
GPW 108552 4/17/43 Louisville, KY. USA 20371278 (DOD est./Tom W.)
Bantam T3 4582 10/29/42 USA 0173499 (est.)

twinflyer17
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Re: 1943 GPW 108175

Post by twinflyer17 » Thu Jan 11, 2018 11:06 am

Ah, didn't even think about the hot tank. I actually previously removed the thermostat to be sure that wasn't the issue and it still flowed slowly. I'll definitely be looking into local shops that offer that first before dismantling it - that's the last resort I'd like to take! Thanks, Chuck, as always, for the list of good pointers 8)
Sean

GPW 108175 viewtopic.php?f=96&t=267732
DOD 4/14/43 Louisville, KY USA20371070

MVPA
AOPA

OldJeepBob
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Re: 1943 GPW 108175

Post by OldJeepBob » Mon Jan 22, 2018 3:14 pm

And a shout out to your parents, who made that bay available. I am on the uphill end of that equation, and you are lucky Jeep owner!
OldJeepBob
(refers to me And the '44 MB I am building)

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