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willysmjeeps.com :: View topic - HELP!! M38A1 Timing
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HELP!! M38A1 Timing
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Bugler
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Joined: Mar 02, 2014
Posts: 14
Location: Paradise, CA

PostPosted: Mon Apr 14, 2014 3:50 pm    Post subject: Reply with quote

its 180 degrees off. it should be pointing to #1 for the rotor and its pointing at #4. the engine is TDC. So I guess I have to take out the pump gear and index it I guess, right?
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wesk
Site Administrator
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Joined: Apr 04, 2005
Posts: 16257
Location: Wisconsin

PostPosted: Mon Apr 14, 2014 8:38 pm    Post subject: Reply with quote

Did you run the engine to determine it is 180 out?
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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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Bugler
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Joined: Mar 02, 2014
Posts: 14
Location: Paradise, CA

PostPosted: Tue Apr 15, 2014 8:28 am    Post subject: Reply with quote

all it does is shoot fire out of the carb and I changed out the electronic distrib to a NOS distrib with points and sat at 0.20. Compression at #1 the fat part of rotor points at #4 instead of #1 on distrib. I've checked this over and over again and the conclusion is that it is out 180.
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wesk
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Joined: Apr 04, 2005
Posts: 16257
Location: Wisconsin

PostPosted: Tue Apr 15, 2014 8:45 am    Post subject: Reply with quote

The only problem with your conclusion is the distributor only fits one way so a 180 degree error is only possible if you have the wrong cylinder at top on compression IE have #1 at top on it's exhaust stroke.

Let's look at what we covered earlier.

1 - #1 TDC on compression. This done using your thumb over the spark plug hole. Don't rely on the two gear marks.They line up twice each cycle. Once on Compression and Once on Exhaust! If you err and set everything with #1 TDC exhaust then yes you will be 180 deg's off.

2 - The oil pump indexing then matches the illustration.



3 - Then the distributor rotor points to the correct lower



4 - The wires are arranged correctly per the illustration.



You must meet these four requirements in the order posted for the timing to end up correct.
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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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Bugler
Member


Joined: Mar 02, 2014
Posts: 14
Location: Paradise, CA

PostPosted: Tue Apr 15, 2014 2:21 pm    Post subject: Reply with quote

She is up and running Very Happy. Thanks alot Wes, the guys at the DAV have something to ride in at the parade the end of this month. Thank you.
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RICKG
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Joined: Aug 31, 2010
Posts: 1741
Location: SO IDAHO

PostPosted: Tue Apr 15, 2014 2:52 pm    Post subject: Reply with quote

Good News!! It's helpful to post your remedy for us. Could help out
others in the future. You re-indexed the oil pump 180 deg??
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keep 'em rollin'
RICKG MC 51986 DOD 01-52, '50 CJ3a
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Bugler
Member


Joined: Mar 02, 2014
Posts: 14
Location: Paradise, CA

PostPosted: Tue Apr 15, 2014 5:26 pm    Post subject: Reply with quote

Distrib was bad so got new one, installed it and off it went.
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4x4M38
Member


Joined: May 30, 2014
Posts: 3447
Location: Texas Hill Country

PostPosted: Sun Aug 30, 2015 2:30 pm    Post subject: Reply with quote

Just wanted to thank Wes and the rest of the folks for again
providing quality information.

My son in laws CJ5 was out of time. He couldn't find the timing
marks and the distributor would not move far enough to set the
advance properly.

I found this post with timing info on the A1, found the three versions
of the timing marks, which we used to find the stamped info
on the cover.

Further reading explained the need for clocking the oil pump
correctly. He loosened the pump, turned the gear one tooth,
bolted everything up tight and now the distributor has equal
adjustment either side of TDC.

After I left he set the advance, connected everything back up
connected a timing light, reset the advance and the jeep is
running great !

Thanks again.
Brian
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Brian
1950 M38
MC11481
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