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I’ve made several posts about my M38 engine issues and thought I’d update. As to carb issues YS637 never could get the first one to operate. Got a second core, rebuilt carb issue solved. Buuut....then found it was still missing and sure enough those “new” plug wires? One was bad. Then still a ignition stutter when not under a load. Quite a bit of play in the Autolite distributor so bought a “new” one. Junk. Just rebuilt the Autolite runs sweet. I can’t say enough about Willy’s Distributors had everything to rebuild the Autolite which is solid. Thanks for all who contributed to my issues. Now...off to the MEP 803 generator. Winter coming. Neal

Increased the timing to 8-10 degrees runs spunky with 89 octane gas.

Thank you for the update! I really enjoy hearing not only the issue , symptoms,etc ( as I have plenty of them too!) but the resolution to issues, these updates really help to track down similar issues as they inevitably crop up!
Thanks again,
Dave

Ditto! Thanks!

Another post I made was concerning wiring mine was shot. I found a nos M170 harness shortened the rear part and converted to a 12v single wire alternator dual pulley. I ran a 12ga wire dedicated to powering the 3 lever light switch and a separate wire with circuit breaker for ignition. I just replaced the pin in the light plug with the new wire. I removed the 20amp circuit breaker from the 3 lever light switch. Fabricated the front headlight harness from surplus harnesses and connectors from Saturn Surplus. Used 2 left rear lights to have dual brake lights. Bulbs from a pin ball supplier in CA. All can be put back to 28v in a day.

The block in my M38 is civilian sn but was new or overhauled a long time ago. Standard bore looks new inside. Had low oil pressure. Pulled the relief valve, broken spring. Shimmed it running 40wt here in the south now 20# + when hot at cruise. 10-15 at idle. Leaking trans grease out the bell housing pulling the trans Tuesday date tag says 7/15/51 and the Jeep was delivered in 08/51 so probably original to the Jeep.

I put a new Melling oil pump in and instantly got 55 pounds; from 30 with the original aluminum pump.