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EFV-8 Club Forum / General Ford Discussion / '36 ignition problems?

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Discussion Topic: '36 ignition problems? -- page: 1 2 3

Flatbob

06-27-2012 @ 12:54 PM

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Cylinders 6,7&8 won't fire. Here's what I've done: replaced plug wires, three plugs, condenser and had Skip rebuild coil and go through distributor. The car starts easily but I still have the same problem. After Skip rebuilt coil I sent the entire distributor to him to see what he could do & here the mystery deepens, the distributor came back & I can see he either replaced the rotor(s) or cleaned them up & new gaskets but there was no bill or explanation. I've since contacted him by email but have not heard from him. Anybody have an idea as to why 6,7&8 won't fire?

kubes40

06-27-2012 @ 1:49 PM

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It has to be either a bad inner cap(s) and / or rotor OR the wires are not properly seated in the inner cap(s).
Double check that. I check with an ohmmeter. It is fairly easy to dislodge a wire or two when reassembling the inner & outer caps.
There is an air gap that must be maintained between the inner cap terminals and the rotor. If I recall correctly it is .015".
My advice?
First, check each and every inner cap terminal to plug wire end for continuity. If all check well, then check the gap between each and every inner cap terminal to the rotor tip.
Don't get too frustrated. This is a simple one. I am guessing you have already looked right at it and not seen it.
I have certainly done such.

Did you send the inner caps to Skip?

ford38v8

06-27-2012 @ 1:55 PM

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Bob, check your spark intensity. Put your screwdriver near a head nut for that, not a plug. Compare the intensity of # 6, 7 & 8 to the intensity of # 5. This may confirm an ignition problem. Unbolt the conduit and hold it with gloves near a ground point. That would confirm a short inside the conduit. Remove the left caps and carefully separate the two, you may find that those three wires are not firmly installed in the inner cap. Remove the inner cap and inspect inside with a strong light. You may find carbon traces.

With the engine warmed up, remove all spark plugs and do a compression test. You may find eratic compression values, and much lower in those three cylinders.

Alan

Flatbob

06-27-2012 @ 3:09 PM

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I did send the complete distributor to Skip's along with the inner caps & covers. Do I check continuity with inner cap installed on end of plug wire? What should I see on the meter? Thanks for the help guys. Bob

This message was edited by Flatbob on 6-27-12 @ 4:12 PM

ford38v8

06-27-2012 @ 6:07 PM

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Bob, Kube's got a good idea there. With the inner and outer caps together, both caps off the distributor, check continuity from the contacts insde to the plug clip of the wire.

Alan

Flatbob

06-27-2012 @ 8:28 PM

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That's exactly what I'm going to do in the morning, my meter emits an audio sound for continuity which should be helpful when I'm under the car. thanks for the help

Flatbob

07-01-2012 @ 12:20 PM

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Kubes40, I did the continuity check at the inner cap from the other end of the plug wires for 5,6,7, & 8 and everything checks out, yet 6,7 & 8 won't fire. So having had the coil rebuilt, new condenser, plugs & plug wires leaves only the rotor but as I said I've previously sent the entire dizzy to Skip to go through. Really don't know what to do next. Bob

This message was edited by Flatbob on 7-1-12 @ 12:42 PM

40 Coupe

07-02-2012 @ 3:44 AM

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Make sure the plug wires are connected to the proper location in the inner distributor cap.

supereal

07-03-2012 @ 6:01 AM

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I agree with 40. Is there spark at the dead cylinders, or is it at the wrong time ? It is very easy to install the plug wires in the wrong places in the cap. If the other five cylinders are firing, I wouldn't expect the coil to be at fault. Skip knows his stuff, so it is unlikely the distributor, itself, is bad. The fact that all dead cylinders are on the same side is the clue.

TomO

07-03-2012 @ 7:54 AM

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40 Coupe gave you good advice, but I would like to add that make sure that you are counting the cylinders with no 1 on the passenger side of the car and that you are using the correct numbers on the inner cap. Here is a link to the spark plug wiring diagram for a 36.

http://www.vanpeltsales.com/FH_web/FH_images/FH_engine-pics/Flathead_Distrbtr-wiring-1932-36.jpg

Tom

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