|
Post by oldscot3 on Nov 11, 2019 20:01:41 GMT -5
Greetings - I acquired a '48 cj2 about two months ago;the PO gathered the parts and assembled it. It's not a show winner but all parts and components are correct for a cj2a with the only exception being a 12 volt alternator. While the PO built it, he apparently actually drove it very little, so it has been my task to sniff out and sort out the "new" car bugs as well as chase down a few of the remaining small items that were missing. By and large it has run reasonably well but lately an intermittant issue has cropped up. After a few minutes of driving, when the engine fully warms, the engine starts cutting out. i currently suspect an electrical problem and have gone through the distributor and ignition switch. Both passed inspection and testing. Next I will trace the power source line from the switch. If I fail to find an electrical problem the fuel system is next. The spark plugs were black like a flooding problem but no black smoke has come from the tailpipe and if you have no spark you're not burning fuel.
The carburetor has worked flawlessly for weeks now but may possibly have trapped some debris from no telling where. My fuel pump is new, it was about the first part I installed because the old unit was leaking. I've read that the new glass bowl pumps may provide too much pressure but it worked fine for five to six weeks. I guess I'll hook up a guage and see what pressure its producing. If that is a problem, I'll get a regulator. If that isn't a issue I'll pull the top off the carb and inspect. I'm a little reluctant to do that though, if I tear a gasket I'll have my jeep down for sure until I get replacements. I'm sending a spare to scoutpilot for assessment and hopefully rebuilding. I may just wait for that to come back if I don't the problem somewhere else in the meantime.
All suggestions are welcome... thanks, Andy in Texas.
|
|
|
Post by Scoutpilot on Nov 12, 2019 5:51:40 GMT -5
Hello Andy. You'll find plenty of good advice here. Some hints. Are you sure of the condenser? Is there a fuel filter installed? What is the condition of the fuel tank? Fresh gas? Let's start there.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Nov 12, 2019 10:13:02 GMT -5
Hello Andy. You'll find plenty of good advice here. Some hints. Are you sure of the condenser? Is there a fuel filter installed? What is the condition of the fuel tank? Fresh gas? Let's start there. X2 on the condenser!.... Lee😉
|
|
|
Post by oldscot3 on Nov 12, 2019 14:33:41 GMT -5
fresh gas, ethanol free. a bright flashlight shined in the tank filler looks nice and clean. had a cheap clear filter when I replaced the fuel pump, I left it off but I've been watching the pump bowl closely and can't see a speck in it.
points and condenser appear new but a new set is cheap. I'll throw a new set in and finish tracing my wiring.
question; would the 12 volt conversion require a different condenser?
|
|
|
Post by Scoutpilot on Nov 12, 2019 15:09:50 GMT -5
It does require a 12V coil. Question. The alternator was the ONLY thing changed? The battery is still 6V? The voltage regulator is still 6V?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Nov 12, 2019 18:02:51 GMT -5
The stock 6volt condenser will work fine. When doing a 12v conversion you have 2 options regarding the coil, use the original 6 volt and install a “Ballast Resistor” in the +lead coming from the ignition switch, or install a 12v internally ballasted coil, either works fine. I prefer Standard Ignition products, available at O Reilly’s, never had a condenser failure with Standard.
Lee😉
|
|
|
Post by oldscot3 on Nov 12, 2019 20:09:33 GMT -5
No, not just the alternator. It has a ceramic body resistor, lights changed etc. I haven't examined the coil but I will. Funny thing is, I would think gremlins in regard to the conversion would have been present since I first started driving it around. This problem only cropped up recently, that's kind of what makes me think it might be as simple as a loose wire somewhere on the battery supply side circuit. It has all new wiring, maybe something wiggled loose after enough vibration worked on it.
It's very cold here now, in a couple days I'll get back on it. If I don't find an electrical issue I'll start checking the fuel system. maybe my new fuel pump is borderline on over pressuring the needle and seat. I can rig up a temporary pressure guage. If it is too much, what regulator do ya'll recommend, and where do I buy it?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Nov 12, 2019 21:47:55 GMT -5
Your ceramic body resistor is indeed a ballast resistor, I doubt you have a coil issue as they rarely fail, I would suspect a condenser first.... If your running a Carter WO I see no need for a fuel pressure regulator.
Lee😉
|
|
gmcjr
KJRT
Posts: 897
First Name: Gary
|
Post by gmcjr on Nov 12, 2019 22:44:42 GMT -5
Your ceramic body resistor is indeed a ballast resistor, I doubt you have a coil issue as they rarely fail, I would suspect a condenser first.... If your running a Carter WO I see no need for a fuel pressure regulator. Lee😉 X2! and a late Welcome! Whereabouts in the Lone Star are you? I’m north of the DFW crap-hole. A few questions: Alternator conversation, assuming GM 10si? What is the charging voltage? (Measured at the Battery with engine running fast enough to “excite” the alternator.) In the original post, you said plugs black?Possibly incomplete ignition from a weak spark. Checking the needle and seat in the carburetor could be considered good practice anyways, but its usually obvious as gas will pour out the top of the carb. (IMHO, a Ceramic filter from Scoutpilot is a very good addition) Also wouldn’t hurt to verify fuel pressure, but if too high or too low, really need to find the actual issue, instead of adding a regulator. Like my good buddy Lee said, it’s not needed with a stock configuration and just adds unneeded complication and clutter.
|
|
|
Post by oldscot3 on Nov 13, 2019 8:17:51 GMT -5
I'm in the hill country area of central Texas, Kerrville. We're located about 20 minutes from the Fredericksburg area; what's become the "tourist's wine country".
I'm going to O'Reilly's to get a condenser, with luck I'll get it in and go for a test drive this afternoon. If so, I'll report back this evening.
Thanks all.
|
|
|
Post by oldscot3 on Nov 15, 2019 18:51:04 GMT -5
I installed a new Blue Streak condenser today. It may have done the trick. I drove the jeep around for about 20 mnutes after letting it warm up to full operating temperature, it never missed a lick. Tomorrow I'm taking it to the ranch for the day, that should tell me for sure if it's cured.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Nov 15, 2019 19:40:52 GMT -5
Hope this does it! 👍👍👍
|
|
|
Post by oldscot3 on Nov 17, 2019 9:41:05 GMT -5
I ran it quite bit yesterday, certainly long enough for the problem to occur, and it never missed out once. Thanks gents, it probably would have been awhile before I got to the condenser. It's been well over 30 years since I last had a vehicle with points.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Nov 17, 2019 12:49:19 GMT -5
I ran it quite bit yesterday, certainly long enough for the problem to occur, and it never missed out once. Thanks gents, it probably would have been awhile before I got to the condenser. It's been well over 30 years since I last had a vehicle with points. 👍 Welcom back to the life of simple machinery 😂 Enjoy your Jeep as well!.... Lee😉
|
|
|
Post by Jeff Glasser on Nov 19, 2019 9:56:31 GMT -5
Hi people after a very long time. re the misfire post, I sold my '42 GPW a few months ago due to ill health. luckily it's gone to a really good home where it shares a brand new hangar with the owners '44 L4 Piper Cub. (I'll see if I can add a photo') Anyway, I rang him later to see if all was well, he said that after picking it up and only a few miles into his journey it started to misfire.(something it's never done before! why do they do this!!) It was still running so he elected to continue. I suggested that it could be due to fuel that was six months old. After a couple of miles it suddenly picked up and ran perfectly and did so for a couple of weeks. With no warning it did it again and he only just managed to get it home where on inspection it was found that one of the contacts in the points had fallen out! I don't know how it kept running! I had supplied him with a set of points that I had bought several years ago and these were fitted and once again it has run perfectly ever since. I'll get to my point (excuse the pun!) now. Before selling I had fitted all new ignition parts just to make sure the new owner wouldn't have any trouble ! Sadly, I believe these parts are made in China and are rubbish. I also believe oldscot3's problem is most likely the same. I hope he gets it cured soon.
|
|