Engine no start 1967 CJ-6 w/ Dauntless
strayTexan
Jeeper
Hey y'all I'm a big newbie to Jeeps... basically I am helping a friend get their 1967 CJ6 with the V6 started up again after four years of not running. He's pretty mechanically dis-inclined, so I've been trying to help him out and also learn something about carbureted engines. Here's what has happened so far...
Got a new battery, spark plugs, and spark plug wires, rebuilt the original Rochester two barrel carburetor.
Put a little motor oil in each cylinder. Drained the old gasoline and filled it with fresh gas. Put in a new-ish fuel filter and flushed the lines. The filter seemed all right so I tried cranking it several times and it would not start. Removed the motorcraft carb a previous owner installed, rebuilt the original carburetor and tired cranking again and it would not start. There was some back fire, some exhaust, but the engine would basically misfire once or twice and then die (I guess that's the odd-fire?). Here's more of a breakdown on the no start condition, as best as I can see it (I just work on cars for fun, there could be things I'm missing here).
Fuel: fresh gasoline; previous owner installed electronic fuel pump (that may be giving too much/too little pressure to the carb, I don't have any in-line pressure gauges); accelerator pumps on rebuilt carb are putting a strong stream of gas into the intake.
Air: the choke is completely manual, I have tried cranking with closed choke and open choke, we're in Santa Fe but the altitude shouldn't be that big deal.. right?
Spark: spark plug tester shows we're getting spark all the way to the plugs, also the exhaust and backfire would indicate to me the fuel is being ignited. I am lazy and didn't gap the plugs to spec, but would that really keep it from cranking? Am I missing something?
Timing: supposedly ran like a charm in 2022, haven't messed with it.
So... what do I do next? It was sitting for a long time in bad conditions (rodents took over, engine bay was not properly plugged up, some rodent droppings or sticks or things may have gotten into the intake). I did a dry compression test and the numbers were not encouraging. Pretty much 130 ish (adjusting for altitude) all around (is that normal for these engines?), except cylinder 1 was maybe 110~120 and cylinder 3 was only 100. (apologies for rough numbers, I wrote them down and can post them if they need to be exact). It seems to me that sitting for so long, the piston rings or something on one side of the engine went bad, now it won't start? How can I check that? Is it worth pulling off the intake and vacuuming some more? Wet compression test? I'm at the edge of my skills here.
Last, my friend is not excited about putting more money into it and we're really not on terms where I want to buy him a new engine lol. So if we can't get it running on bubble gum and elbow grease it's just going to sit.
Got a new battery, spark plugs, and spark plug wires, rebuilt the original Rochester two barrel carburetor.
Put a little motor oil in each cylinder. Drained the old gasoline and filled it with fresh gas. Put in a new-ish fuel filter and flushed the lines. The filter seemed all right so I tried cranking it several times and it would not start. Removed the motorcraft carb a previous owner installed, rebuilt the original carburetor and tired cranking again and it would not start. There was some back fire, some exhaust, but the engine would basically misfire once or twice and then die (I guess that's the odd-fire?). Here's more of a breakdown on the no start condition, as best as I can see it (I just work on cars for fun, there could be things I'm missing here).
Fuel: fresh gasoline; previous owner installed electronic fuel pump (that may be giving too much/too little pressure to the carb, I don't have any in-line pressure gauges); accelerator pumps on rebuilt carb are putting a strong stream of gas into the intake.
Air: the choke is completely manual, I have tried cranking with closed choke and open choke, we're in Santa Fe but the altitude shouldn't be that big deal.. right?
Spark: spark plug tester shows we're getting spark all the way to the plugs, also the exhaust and backfire would indicate to me the fuel is being ignited. I am lazy and didn't gap the plugs to spec, but would that really keep it from cranking? Am I missing something?
Timing: supposedly ran like a charm in 2022, haven't messed with it.
So... what do I do next? It was sitting for a long time in bad conditions (rodents took over, engine bay was not properly plugged up, some rodent droppings or sticks or things may have gotten into the intake). I did a dry compression test and the numbers were not encouraging. Pretty much 130 ish (adjusting for altitude) all around (is that normal for these engines?), except cylinder 1 was maybe 110~120 and cylinder 3 was only 100. (apologies for rough numbers, I wrote them down and can post them if they need to be exact). It seems to me that sitting for so long, the piston rings or something on one side of the engine went bad, now it won't start? How can I check that? Is it worth pulling off the intake and vacuuming some more? Wet compression test? I'm at the edge of my skills here.
Last, my friend is not excited about putting more money into it and we're really not on terms where I want to buy him a new engine lol. So if we can't get it running on bubble gum and elbow grease it's just going to sit.
