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11-02-2012, 12:54 PM | #21 |
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Re: 47 ran rough then not at all. Need ideas.
I have experienced a bad cap. It deteriorates and then gets so bad it just won't work. Same with a rotor. You seem to have covered everything else, I'd recommend the crab for ease of access. My personal experience is to use the lowest resistance leads and plug caps, it reduces the ht load on the cap and rotor.
Mart. |
11-02-2012, 02:36 PM | #22 |
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Re: 47 ran rough then not at all. Need ideas.
I know this probably wont help, but a wise old flathead mechanic once told me "90 percent of flathead ignition problems, are fuel related"
Did you by any chance just get a fresh tank of bad fuel somwhere along your route? |
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11-02-2012, 07:51 PM | #23 | |
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Re: 47 ran rough then not at all. Need ideas.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 11-02-2012 at 07:58 PM. |
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11-02-2012, 07:53 PM | #24 |
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Re: 47 ran rough then not at all. Need ideas.
[QUOTE=JM 35 Sedan;526734]Bypassing the ignition switch, as mentioned above, would be something to try. QUOTE]
Thanks for the suggestion. Tried that. Didn't help any.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
11-02-2012, 07:54 PM | #25 |
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Re: 47 ran rough then not at all. Need ideas.
Thanks for the suggestion. Bypassed that wire with a jumper wire. Didn't help.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
11-02-2012, 07:55 PM | #26 |
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Re: 47 ran rough then not at all. Need ideas.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
11-02-2012, 07:57 PM | #27 |
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Re: 47 ran rough then not at all. Need ideas.
Thanks for the suggestion. Tried a different condenser that read within specs on the multimeter. Didn't help.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
11-02-2012, 08:00 PM | #28 |
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Re: 47 ran rough then not at all. Need ideas.
I'm not sure how to test for bad fuel. Just filled up at a Texaco which is a Top Tier station so I hope it wasn't bad gas. How would I know?
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
11-02-2012, 08:56 PM | #29 | |
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Re: 47 ran rough then not at all. Need ideas.
Quote:
#4-82 #8-65 #3-79 #7-80 #2-91 #6-89 #1-84 #5-84 My engine was rebuilt 25,000 miles ago and this compression test is at 5,000 feet elevation which lowers the sea level specs of 105-125 psi to 70-90 psi. I'm not seeing any problem here that would keep the engine from starting nor effect its running smoothly. Do you?
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
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11-02-2012, 10:26 PM | #30 |
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Re: 47 ran rough then not at all. Need ideas.
Old Henry have you tried a new set of plugs? Had a similar problem to you. Went through everything. Put in 8 new ones and all was good..
GB
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11-02-2012, 11:42 PM | #31 | |
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Re: 47 ran rough then not at all. Need ideas.
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But thanks for your suggestion.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
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11-03-2012, 03:39 AM | #32 |
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Re: 47 ran rough then not at all. Need ideas.
All the plugs spark when connected directly to the coil. The coil is working, the plugs are working.
More evidence that the cap is at fault, or at least must be the next area of investigation. Keep going it will become clear soon enough. Remove the cap and leads and examine it very closely, there may be a crack allowing the spark to leak to ground or just get lost in the ether. Mart. |
11-03-2012, 07:32 AM | #33 |
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Re: 47 ran rough then not at all. Need ideas.
a plug can break down under compression. replace them and see if thats a contributer. less expensive start before tearing the distributer apart first
... don |
11-03-2012, 09:38 AM | #34 |
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Re: 47 ran rough then not at all. Need ideas.
Are you useing the dist cap with the rabbitt ears or the crab cap. I've had 2 of the black crab caps that have a carbon trace from the terminal close to the 2 snap clips and the spark would go right through the cap to the snap clip. Walt
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11-03-2012, 10:38 AM | #35 |
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Re: 47 ran rough then not at all. Need ideas.
Take the dist out and lay on fender run a ground wire to dist case.
Add longer wire from points to coil,longer power wire to coil. The coil wire out put to near ground should spark 1/2" Turn key on and turn dist by hand and watch it spark. If good and sharp turn check for loose shaft if ok Must be caps and rotor. |
11-03-2012, 05:33 PM | #36 |
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Re: 47 ran rough then not at all. Need ideas.
It would seem that you have checked everything short of the plug wires. If you get a steady spark out of the coil, but not when you run through the caps and the wire looms, that woudl be a good place to check. If you are using the orignal wire loom tubes, it is possible that you are cross firing through bad wires inside the tube. Try running a seperate set of wires that are new and outside the tubes.
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11-03-2012, 06:01 PM | #37 | |||||
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Re: 47 ran rough then not at all. Need ideas.
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THANKS TO ALL FOR YOUR KIND CONSIDERATION OF MY PROBLEM AND ALL OF YOUR HELPFUL SUGGESTIONS. I APPRECIATE IT VERY MUCH.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 11-03-2012 at 06:59 PM. |
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11-03-2012, 09:11 PM | #38 |
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Re: 47 ran rough then not at all. Need ideas.
OK. I peeled the ruddy octopus off of the top of my engine. Here's the inside of my distributor cap.
Even with my untrained eye I think those big gouges in many of the posts can't be good. For sure the cap has got to be replaced. (It only has 30,000 miles on it. Why not?) Question is: The only way I can think those gouges got in there is for the rotor to hit them. Why did it hit them? Is there something wrong with my distributor that it would allow the rotor to hit those posts and wear those big gouges in them? If so, how do I diagnose the problem and how do I fix it? ADDENDUM: I think I found the answer. I took the distributor out and found play in the shaft that the rotor is mounted on. Worn shaft or bushing I'm thinking. What's next? New distributor? Keep in mind I'm not a machinist that can remove and reinstall that bushing if that's what it takes. AND LATER: I see where I can buy both of the bushings for both ends of the distributor shaft (they're both worn). Is that all that I need to replace? Is that something I can do without machinist's equipment? If so, how do I get the old bushings out? I expect that if I can get the old ones out that I can press the new ones in.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 07-28-2013 at 12:35 AM. |
11-03-2012, 09:58 PM | #39 |
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Re: 47 ran rough then not at all. Need ideas.
i think you can get most of the parts you need from the catalog guys....C&G looks to have the bushings...maybe more parts if needed....Mike
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11-03-2012, 10:37 PM | #40 |
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Re: 47 ran rough then not at all. Need ideas.
Henry, it sounds/looks like you have found the main source of the problem.
A couple thoughts.... 1. If the bushings are worn, make sure the shaft journals that ride in those bushings are not damaged. 2. You should be able to press or pull those old bushings out and press new bushings in place. However, after those new bushings are in place, they may need their ID's reamed to give proper clearance for shaft journals. I know this is what I had to do when I put new bushings in a '35 helmet distributor.
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John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein Last edited by JM 35 Sedan; 11-03-2012 at 11:30 PM. |
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