Joined: Oct 15, 2006 Posts: 27 Location: Andrews Texas
Posted: Tue Oct 17, 2006 5:23 pm Post subject: Gas with Oil?
Hello everyone. I'm new to the forum. I recently bought a 54 m38a1 jeep. and i have a few questions.
1. I have gas in my oil. I'm not sure how this could happen.
2. When I floor the jeep it takes it a awile to reve up.
3. When I try to drive it, it bearly moves. maybe 1.5 miles an hour?
4. My carb has a loud suction noise.
5. My distributor has a vacuum coming in the bottom and one going out, splits and goes to the air filter and to the carb.
6. It takes a good wile for my jeep to start up.
7. On the carb. which is the air and fuel set screws?
8. I have the original unit number to the jeep (still on the hood) 2A3066
U.S. Army. Can i research this and find out information?
9. Where is the governor on my jeep? and how do i adjust it?
10. What can i use to clean up my data plate?
11. What kind of oil do i use?
Engine runs and idles okay. any information would be GREATLY appreciated. I'm 21 years old with NO expirence on vehicles. Just a love for old jeeps. anything is helpful.
Sounds like you may have a vacuum leak problem. You need to identify where the leaks are coming from. Sounds like the carb area could be one.
Gas in the oil could be the fuel/vacuum pump has a bad diaphram and needs to be rebuilt.
As for the set screws on your carb, it is hard to see, but it looks like you have the civilian solex, which is OK, I think the set screws are on the engine side, but I am not sure.
I don't know that your jeep would have a govenor.
Cleaning the dash data plates: start with soap and water. They are usually made of brass, you can take some brass cleaner to them.
There should be a data plate on the dash with oil requirements for different enviromental temps.
Looks like you a have a good vehicle to start with. I would bet most of your engine problems are the vacuum leak and fuel pump.
Others here with more technical info than I should be along soon to help you out more. _________________ Ryan Miller
MVPA # 22010
1. I have gas in my oil. I'm not sure how this could happen.
Number one cause is a bad diaphram in you fuel pump. Just a small hint of a gas smell will usually not blow your oil pan off. We OLD TIMERS used to know how to dilute oil with gas at sub-zero temps to get the darn thing to turn over.
Quote:
2. When I floor the jeep it takes it a awile to reve up.
That could be several things many not even related. First place to look is timing. Make sure centrifugal advance is working. Make sure accelerator pumps is working.
Quote:
3. When I try to drive it, it bearly moves. maybe 1.5 miles an hour?
Check the items under #2 plus check for dragging brakes and slipping clutch.
Quote:
4. My carb has a loud suction noise.
That level of sucking is dependent on ones view of just how much sucking is too much. If you have the crossover pipe off and are standing on the gas pedal then a lot of suck is normal. If you are idling and as soon as you try to accelerate the engine she sucks loudly without a reasonable response then that sucking is abnormal. Check the item 2 items again and check for vacuum leaks and restricted exhaust.
Quote:
5. My distributor has a vacuum coming in the bottom and one going out, splits and goes to the air filter and to the carb.
That's a vent tube on both sides of the distributor. The M38 and M38A1 does not have vacuum advance distributors. That tube should be clear so it can evacuate corrosive and volatile fumes from the enclosed coil and help cool the coil. The line runs to a "T" on the left side of the engine. Make sure that line has a .040 restrictor in it at the "T" so you don't loose too much vacuum.
Quote:
6. It takes a good wile for my jeep to start up.
This generally indicates a tuneup is due. Be sure you're operating it correctly. With a vacuum operated accelerator pump in the carb she must be turning over very quickly and during cold starts the choke must be pulled all the way out for it to work. Pumping the gas pedal does nothing during the initial start sequence.
Quote:
7. On the carb. which is the air and fuel set screws?
There are only 3 adjustments on the YS series carb. Flaot adjustment. Idle mixture adjustment and idle speed. But looking at you photo you have a civilian CJ YF carb installed. Same three adjustments though.
Quote:
8. I have the original unit number to the jeep (still on the hood) 2A3066 U.S. Army. Can i research this and find out information?
The 2A3066 is the Army vehicle registration number. The Army did not maintain records on non-tracked tactical vehicles after they left the Army. The only clues to your jeep's history are in paperwork found with her, finding people who recall the registration number while they were in the servie, carefully wet sanding thru all layers of paint looking for and recording all numbers, letters and words found and then posting them here and asking for any info on them.
Quote:
9. Where is the governor on my jeep? and how do i adjust it?
M38's and M38A1's did not come with governors on them.
Quote:
10. What can i use to clean up my data plate?
The dash plates you must be careful with. Soap and water or 409 and water and scrub with a tooth brush. Then take a small block of wood and wrap a cloth soaked with a little brasso around it and gently clean the raised shiney areas.
Quote:
11. What kind of oil do i use?
Just follow your recommended lubes in your manual.
Did I mention that no one should own one of these without having at least the 4 basic manuals the Army published for it.
TM 9-8014 Operator's Guide and maintenance manual.
TM 9-8015-1 Engine and clutch manual.
TM 9-8015-2 Powertrain and body manual.
ORD 9 SNL G-758 M38A1 Parts Manual
Joined: Apr 14, 2005 Posts: 153 Location: N. Wisconsin
Posted: Wed Oct 18, 2006 9:49 pm Post subject:
This site's great technical gurus have already given you all the information and guidance you need to get started, so I just want to chime in and say welcome! Congratulations on having the original hood number. That's a real plus. Mine is 2A3514, so our jeeps are pretty close in time. Good luck and keep posting updates... with pics! _________________ Support our troops, past and present.
Dave
M38A1 2/55, MD81433, U.S. ARMY 2A3514
M100 Dunbar Kapple, ?/51, #15122
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
Forum FAQ
Search
Usergroups
Profile
Log in to check your private messages
Log in
