M38A1 engine problems

giacomo · Member Joined: Apr 11, 2011 Posts: 68 Location: Italy

Hi all,

after reviewing the original carburetor and now I have made a few Km explosions and flames from the exhaust, and even not starting

fuel or electrical problems ?
thank you

Giacomo

wesk · Posted: Thu Jul 07, 2016 8:47 am Post subject:

What you have posted is not enough information for us to offer any specific advice. Not sure of your meaning "after reviewing original carburetor".

1-When did the engine stop running properly? Or when was the last time the engine was run smoothly?

2-What did you do to the carburetor and why did you do it?

3-Have any other repairs been made to the engine recently?
_________________
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

giacomo · Member Joined: Apr 11, 2011 Posts: 68 Location: Italy

Hi wesk

1 carburetor kit rebuild

2 the last time the engine is running properly was when the carburetor was overhauled

3 I recently replaced the spark plugs with cables

thank you

Giacomo

wesk · Posted: Thu Jul 07, 2016 8:02 pm Post subject:

Let me be sure what you just said:

1: carb was rebuilt and then the engine run well.

2: Spark plugs and Cables were changed and now the engine runs poorly or not at all.
_________________
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

giacomo · Member Joined: Apr 11, 2011 Posts: 68 Location: Italy

I confirm what I said
the engine went well for 5/6 Km then started to backfire in the exhaust with flames and now will not start
thank you

Giacomo

wesk · Posted: Thu Jul 07, 2016 11:22 pm Post subject:

Was there heavy fuel smell when the backfiring occurred coming from the engine compartment?
_________________
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

giacomo · Member Joined: Apr 11, 2011 Posts: 68 Location: Italy

No fuel smell from the engine compartment

Giacomo

wesk · Posted: Fri Jul 08, 2016 12:39 am Post subject:

Normally backfiring is associated with overly rich mixtures indicating a stuck float or overly lean mixtures resulting from leaking induction manifolds. A stuck float will leave a heavy fuel smell in the engine compartment which you do not have. Overly lean is still a possibility so check for intake leaks. If you can get the engine to run long enough it is easier to find intake leaks with a propane enrichment test.

An episode of backfiring and flames followed by a no start condition is more indicative of an ignition system failure. Since you also said you replaced the ignition leads, look for damage to the distributor housing. Inspect the distributor completely for any damage or evidence of arcing or carbon tracking.
_________________
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

giacomo · Member Joined: Apr 11, 2011 Posts: 68 Location: Italy

I did a fuel flow control on the carburetor and the hose comes out very little fuel
It could also be a petrol pump problem ?

Giacomo

scoutpilot · Posted: Fri Jul 08, 2016 3:25 am Post subject:

Are you absolutely certain you replaced the spark plug wires in the correct order and placement?
_________________
Old fashioned service never goes out of style.

wesk · Posted: Fri Jul 08, 2016 7:46 am Post subject:

He said it ran smooth for the first several Kilometers so they are wired correct.

Giacomo, If you suspect low fuel flow check the in tank filter cleanliness & the in tank pickup tube for damage or rust holes either of which will impede fuel delivery. Also check that tank vent line is not plugged and that fuel cap is in the vented position.

Tubes S & M must not be plugged.

_________________
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

giacomo · Member Joined: Apr 11, 2011 Posts: 68 Location: Italy

Thank you wesk
I now make a check
I would also like an opinion on the front free wheel hubs which I think are not original
I can attach a pics ?

Giacomo

wesk · Posted: Sat Jul 09, 2016 7:12 am Post subject:

The free wheeling hubs were not installed by Willys or Kaiser on the M38's, M38A1's or the M170's.

The US military did make a smooth bore hub kit that allowed the jeep to roll easier in parades and such.

The stock jeep hub on the left has the internal splines to engage the front axle tip while the clary hub on the right only has the bearing and smooth sleeve.

The installation of these hubs was covered in TB ORD 570 shown below:

More photos here:
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album126&op=modload&name=gallery&file=index&include=view_album.php
_________________
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

giacomo · Member Joined: Apr 11, 2011 Posts: 68 Location: Italy

I have seen your pics but my freewheel hub is different
How can I attach the pics ?
thank you

Giacomo

wesk · Posted: Sat Jul 09, 2016 2:24 pm Post subject:

Just go to my photo album and review the other style hubs listed there.

http://www.willysmjeeps.com/v2/modules.php?set_albumName=album125&op=modload&name=gallery&file=index&include=view_album.php
_________________
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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