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willysmjeeps.com :: View topic - M38 Carburetor adjustment
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M38 Carburetor adjustment

 
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Jim
Member


Joined: Apr 14, 2005
Posts: 196
Location: Van Buren, Arkansas
PostPosted: Mon Jun 07, 2010 5:56 pm    Post subject: M38 Carburetor adjustment Reply with quote
My manual on the carb doesn't discuss how to adjust
the idle screw. Mine is a rebuild and I need to make sure
it is adjusted correctly. I assume (dangerous) that you
start from a fully seated screw and adjust it outward some
specified number of turns. Is this correct and if so, how
many turns out? Thanks!

Jim in Darkest Arkansas
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MODIFIED
Member


Joined: Mar 28, 2008
Posts: 353
Location: BrOoKlYn
PostPosted: Mon Jun 07, 2010 7:56 pm    Post subject: Reply with quote
I'd measure best mixture via Vacuum gauge.
-start and warm veh to oper temp
-install vacuum gauge and notice reading
-carefully close (clockwise) idle mix screw (do not not jamb !!! or force tight!!"
-let out (counterclockwise) 1/4-1/2 turn and adjust to best vacuum reading.
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wesk
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Joined: Apr 04, 2005
Posts: 16282
Location: Wisconsin
PostPosted: Mon Jun 07, 2010 8:36 pm    Post subject: Reply with quote
The standard setting for this carb is 1 1/2 turn out from fully seated. Start there and adjust per manual.

The adjustment procedure is in your M38 manual TM 9-8012 page 151.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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Jim
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Joined: Apr 14, 2005
Posts: 196
Location: Van Buren, Arkansas
PostPosted: Wed Jun 09, 2010 3:32 pm    Post subject: Reply with quote
Thanks, Wes. Page 151 didn't have the number
of turns of the screw.

Jim in Darkest Arkansas
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