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wondering if I should check the roll pin at the distributor drive gear. Would a sheared pin advance or retard the timing? Or does the engine just quit completely?.
I don’t think it would run at all if the roll pin sheared. However, if the cam gear and the distributor drive gear are made of mis matched material (say one is cast iron and the other is steel if I recall correctly) then the softer material can wear very, very quickly. The soft gear teeth will “apple core” away and then the dizzy can start skipping = retarded timing.
If the teeth are bad enough to skip you could probably feel the excessive free play by twisting the rotor back and forth. Otherwise you’d have to pull the dizzy to inspect the cam and dizzy drive gears for excessive wear.
If the teeth are bad enough to skip you could probably feel the excessive free play by twisting the rotor back and forth….
Hmm, I’ve already done that as part of the check of the centrifugal advance. The springs felt tight and the rotor would consistently snap back to the same spot when released.
Well, you obviously screwed up. Finally, somebody to blame other than myself! Goodness, my wife is going to be mad at you. Based on previous experience, I’d suggest hiding in a remote cave for several years.
One of the trickiest things about troubleshooting is realizing when you’re in the weeds and heading back to square one. Stubbornness and pride factor into the equation, too.
I only said wow regarding the timing because I'm surprised it ran at all, especially for the 1000 mile break in. I would have been more insistent to check timing but I knew you were following the bang bang thread. I didn't want to be redundant.
I only said wow regarding the timing because I'm surprised it ran at all, especially for the 1000 mile break in…
Yeah, me too.
Could have sworn I set the timing. Maybe I didn’t bring up the speed to the required 800 RPM after disabling the vacuum advance.
My timing light has a **** and scale that lets you change when the light flashes. I noticed today it doesn’t lock at all at the 0 setting. I wonder if I had bumped it last time. That’s the ticket, blame the equipment! Just trying to make some sense of how it was so far off.
That’s part of the reason it was such a low priority to check the timing. It’s not something that typically changes much. Hindsight, of course.
How are your preparations going for cave dwelling? I can send a coded message in a few years when it’s safe to come out. Look for “The sun is hot today but it will be a good day for picking berries.” Stay put if you see “The heavy frost has damaged the pumpkins.”
Karl
check the hold down bolt if tight.
If you set the timing and it is a little loose it will retard the timing as the distributor body turns.
Dave ----
Karl
check the hold down bolt if tight.
If you set the timing and it is a little loose it will retard the timing as the distributor body turns.
Dave ----
Good advice. Kicking myself because normally when about to loosen an adjustment like that, I'll first make sure it's tight. Just an old habit I learned a long time ago. But alas, I forgot to do that yesterday, as I was leaning over a running engine. The bolt could very well have been loose, especially if the distributor didn't quite seat initially when installed a few months ago.
Thanks to your reminder, I've added a paint stripe between the distributor and intake manifold. That way it will be apparent if the distributor moves.
Could have sworn I set the timing. Maybe I didn’t bring up the speed to the required 800 RPM after disabling the vacuum advance.
My timing light has a **** and scale that lets you change when the light flashes. I noticed today it doesn’t lock at all at the 0 setting. I wonder if I had bumped it last time. That’s the ticket, blame the equipment! Just trying to make some sense of how it was so far off.
That’s part of the reason it was such a low priority to check the timing. It’s not something that typically changes much. Hindsight, of course.
How are your preparations going for cave dwelling? I can send a coded message in a few years when it’s safe to come out. Look for “The sun is hot today but it will be a good day for picking berries.” Stay put if you see “The heavy frost has damaged the pumpkins.”
Never underestimate the wrath of a twice scorned woman. I'll wait for the next new moon and make a break for Mexico!
Yes. Decided to leave the Jeep home this time, but from previous experience the extra weight didn’t make a lot of difference in performance.
I made my local test runs sans Jeep, and had been able to duplicate the fault like that, so felt confident enough in the fix. Only took me three days to figure it out!
For those of us who have been sitting on the edge of our seats, the results are great, but we feel cheated for not knowing what finally solved the problem.
we feel cheated for not knowing what finally solved the problem.
See post #44 a few days back. Some chucklehead had the ignition timing way off. Hoo boy, what a moron. Living proof of evolution, if you ask me. That guy couldn’t pour water out of a boot even if directions were written on the bottom of the heel. He’s a few beans short of a burrito. I think you get the general idea…
See post #44 a few days back. Some chucklehead had the ignition timing way off. Hoo boy, what a moron. Living proof of evolution, if you ask me. That guy couldn’t pour water out of a boot even if directions were written on the bottom of the heel. He’s a few beans short of a burrito. I think you get the general idea…
Don't be too hard on "the guy who screwed up". We all have done "stupid" things by accident.
Yeah, I'm thinking your running out of fuel from the carb. Might be time to open the carb and look it over.
Maybe once your home and unloaded, take the truck out for a good hard run, do some WOT a few times and see if it feels sluggish. Maybe find a good long uphill on the highway.
Altitude ? And/ or finicky carburetor. Have been tales about carburetors on hills and grades ( Un level terrain ). Been so long ago I can't remember what issue needed addressing in the carburetor..But the altitude thing ...like small airplanes..You'd have to be driving above timberline..But an example about a carburetor going up or down a grade..Fluid will run to one end. Like I hated living on a hillside street. Parking going downhill ( bugged me ) All fluid is forced to the front..Rear of engine looses all its oil to the front . " NEVER PEE WHILE STANDING ON YOUR HEAD "
Last edited by Indie; Mar 10, 2025 at 04:32 AM.
Reason: Typo
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