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Generation 6 1973-1979 F100, F150, F250, F350

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  #11  
Old 04-21-2015, 09:33 PM
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If your cam gear was getting that far out of whack, you would have likely gotten into some valves. Even though these aren't interference motors, if a valve is wide open when a piston comes up to TDC, they are going to have a meeting that won't end well...
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  #12  
Old 04-21-2015, 10:43 PM
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Distributors are advanced or retarded ..not left or right

What colour is the grommet on your ignition control module where the wiring enters it?

Brown of blue?

Do you have a timing light?
If so..keep track of timing changes using it.

There is 45* between each spark plug contact on the dist.

If the timing is changing dramatically..you may need to be checking the dist shaft twisting by removing the cap and using a remote starter switch and watching the rotor for constant twist.
I can't think of any safe way to hold it from turning manually.
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  #13  
Old 04-21-2015, 10:44 PM
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Is the dist... points or electronic ?
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  #14  
Old 04-22-2015, 06:50 AM
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Being a 71 distributor, I would expect points... 74 should have been as well, but that is not an "always" as I have seen late build date have the next model year parts show up. That was more a Chrysler thing though.
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  #15  
Old 04-22-2015, 02:23 PM
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Points, and no ignition control module. Wasn't an ignition control module from the start. Should there be one? Wouldn't explain why I never had this problem before with the same set up.
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  #16  
Old 04-22-2015, 02:36 PM
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It almost dont sound like a timing issue...
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  #17  
Old 04-22-2015, 03:17 PM
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Have you pulled the distributor yet? - roll pin may be damaged as suggested but also check the balance weights in the distributor ...... maybe there is a difference between ignition curves on the 71 and 73 . I realize i'm posing more questions than answers but if everything mechanical checks out (pretty hard to get it wrong) then i'd say the ignition system has to be where it's at
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  #18  
Old 04-22-2015, 08:02 PM
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With it being a new dizzy, you would hope the darn thing isn't sticking, but it would explain a few things... You have to be within a certain range though for it to be running at all.

Quote:
Now this is really weird --> About the above picture: The distributor, re-manufactured, has two blue dots, one on diaphragm, and one on cam gear. When harmonic balancer marks are aligned at TDC, and I align the two blue dots on the distributor when putting it in, it seem in time when running, but as shown in pic, turned all the way to right, and the distributor rotor is 180 off from where rotor should be pointing (towards cylinder eight).
Let's get back to basics here. Remember how I said the crank makes two full turns per each one turn of the cam? Well, that means the timing mark on the harmonic balancer will align 2 times per one turn of the cam, which then in turn also means that the distributor makes one full revolution per 2 times around on the crank. So that means that there will be two times the mark on the balancer is showing TDC, one when the distributor points at the plug you want to fire, the other time will be halfway through the firing order, which will make the distributor rotor point--- 180 degrees off---. It is possible that you simply are not getting the crank at TDC AND the cam at the point it is ready to fire the #1 cylinder. Common rookie mistake.
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My trucks:
The workhorse, 86 F250 4x4 6.9 nat aspirated, 3.25 exhaust, custom intake, electric fuel pump, otherwise well used stock... not real pretty but just loves to work!

The other heavy hauler, 92 F350 2wd dually crew cab, flatbed/toolboxes, 92 Cummins VE 12V with intercooler, NV4500 manual

The beater: 88 F250 4x4, 5.8 5 speed
The project ... 1978 F150 4wd shortbed 351 auto

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  #19  
Old 04-22-2015, 09:51 PM
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The ignition module came out in 75 with the Duraspark II electronic ignition systems.
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  #20  
Old 04-23-2015, 03:56 AM
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Quote:
Originally Posted by Fellro View Post
With it being a new dizzy, you would hope the darn thing isn't sticking, but it would explain a few things... You have to be within a certain range though for it to be running at all.



Let's get back to basics here. Remember how I said the crank makes two full turns per each one turn of the cam? Well, that means the timing mark on the harmonic balancer will align 2 times per one turn of the cam, which then in turn also means that the distributor makes one full revolution per 2 times around on the crank. So that means that there will be two times the mark on the balancer is showing TDC, one when the distributor points at the plug you want to fire, the other time will be halfway through the firing order, which will make the distributor rotor point--- 180 degrees off---. It is possible that you simply are not getting the crank at TDC AND the cam at the point it is ready to fire the #1 cylinder. Common rookie mistake.
I'd agree with you there Roger - the bit that was said here in the 1st post sort of confuses the issue (Good example of weirdness is yesterday running perfect! Started this morning, and timing totally off, had to reset distributor (Someone pulling my distributor out in the wee hours of the night?)... ) ..... if it is running fine on an intermittent basis then something has to be loose - i'd really like to have the distributor pulled and the roll pin checked on the gear just to eliminate that for a start.
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