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willysmjeeps.com :: View topic - M38A1C Issues with high speed
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M38A1C Issues with high speed

 
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mydadsjeep
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Joined: Apr 26, 2017
Posts: 37
Location: Butler pa

PostPosted: Sun Oct 04, 2020 2:02 pm    Post subject: M38A1C Issues with high speed Reply with quote

Ok, Finally got back on the site. I have a 1952 M38A1C and so far the mechanic and I have replace the gas tank, lines, rebuilt the carb the starter and coils and plugs are fine. Only starts to miss at higher speeds around 45 mph. Even going up the hills it slows down and misses still there.
Now I don't know much about the actually specs and how the motor works but he said it maybe that the compression issues and rings since it sat for around 35 years.
https://i.redd.it/w6sy2ifgusi51.jpg
Here is a picture. So any ideas we can try?>
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wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 15658
Location: Wisconsin

PostPosted: Sun Oct 04, 2020 3:47 pm    Post subject: Reply with quote

It may work better if you allow your mechanic to communicate here with us on this site so we might be able to get two mechanics together right here in the topic.

To answer your question which I assume is not from a mechanic?

The best approach to troubleshooting any power problem is to properly test the machines operating parameters with the proper test equipment then follow the already available troubleshooting guide in the M38A1 / C service manual.

This means take test readings where needed and follow the step by step procedures in the troubleshooting manual. TM 9-8014. If you do not have this manual it is available free in PDF format on our downloads page.

It is common to get the following test readings when troubleshooting a high speed power loss.

Compression test
Leakdown test
Timing tests both static and dynamic as well as checking centrifugal advance.
Test Fuel press at carb.
Test Fuel quantity/flow rate delivered.
Test vent system for fuel tank and carb bowl.

Are you still selling that jeep. I have some old photos apparently taken Sep 2013 in my M38A1 FS files.
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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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mydadsjeep
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Joined: Apr 26, 2017
Posts: 37
Location: Butler pa

PostPosted: Sun Oct 04, 2020 4:40 pm    Post subject: jeep Reply with quote

The jeep in the woods is still there. I had offered $1000 for it and he said yes then later backed out/ I had a friend call him months later and same thing, accepted an offer then backed out. Ill see if I can get my mech on here...
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wesk
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Joined: Apr 04, 2005
Posts: 15658
Location: Wisconsin

PostPosted: Sun Oct 04, 2020 7:58 pm    Post subject: Reply with quote

Looks like the jeep in the woods from back then has the same hard top as your current jeep.


The photo you just sent of your A1 now.


The old jeep in the filed photo.

I guess looking at it again the jeep in the field has a different hard top.
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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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G740
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Joined: Jan 27, 2006
Posts: 489

PostPosted: Sun Oct 04, 2020 8:58 pm    Post subject: Engine miss Reply with quote

I get this question a lot at my business. 9 times out of 10, it is the distributor. The most over looked piece when people do restorations or even just a runner is the distributor. To most people, rebuilding it is simply putting points, condenser, cap and rotor. Ah, but there is so much more. Counter weights, springs, bushings, shaft wear, cam wear etc etc.
Grab the rotor and push it to one side. If you can push it to the side and open the points, you have bushing wear and at higher rpm, the points float because the shaft of the distributor no longer runs in a circle, it runs in an ellipse. Once this occurs, the miss starts and does not go away until it goes back to idle.
I rebuild distributors all the time and most all say that their vehicle has never run that good once installed. Something to look at.
John
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mydadsjeep
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Joined: Apr 26, 2017
Posts: 37
Location: Butler pa

PostPosted: Mon Oct 12, 2020 8:14 pm    Post subject: Reply with quote

Yea the one in the woods don't have the ridges on it if I remember right
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