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  #1  
Old 12-05-2018, 10:00 AM
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cooperino cooperino is offline
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Default Stumped...

So we have the old Clark Airport Tug about finished.

Went to set timing and get it fired up. This engine ran fine before we took everything apart for refurb.

We did pull the distributor out but nothing else was touched.

Now I put the distributor in. Pointed rotor at number 1 and wired plugs to firing order on the head "1-3-4-2"

It pops and almost runs like this. Moved the distributor around but does not run.

There are no visible timing marks on the engine. The book says there is one on flywheel but the access cover only allowed you to see the clutch. Nothing visible on the crank or pulley.

I thought maybe I was 180 out. Lifted out and turned distributor 180. Still the same thing. There are only 2 positions for the distributor "not a gear just a slot"

When checking number one the only method available was to pull plug and rotate until up on compression "thumb over hole" since the spark plug is over the valves not the piston.

I even tried wiring as if rear piston is number one since i read that on some older flatheads that number one could be at flywheel side of engine...

Any ideas guys??
Hopefully there is a flathead guy in our group that will point out something stupid I missed.

Thanks
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Old 12-05-2018, 10:21 AM
R Bedell R Bedell is offline
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Clark, as in Fork Lift....???

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Old 12-05-2018, 10:53 AM
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darkminion_17 darkminion_17 is offline
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Quote:
Originally Posted by R Bedell View Post
Clark, as in Fork Lift....???

Maybe as in bar?
dirty points?
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Old 12-05-2018, 11:16 AM
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Quote:
Originally Posted by R Bedell View Post
Clark, as in Fork Lift....???

No.. The 1943 Clark Tug we refurbished here
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File Type: jpg clarkat1.jpg (21.9 KB, 149 views)
File Type: jpg clarkat2.jpg (20.7 KB, 149 views)
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Old 12-05-2018, 11:17 AM
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Quote:
Originally Posted by darkminion_17 View Post
Maybe as in bar?
dirty points?
No points. It was converted to electronic before we got it. I have good strong spark
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Old 12-05-2018, 01:03 PM
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If all you did was remove the dist, but not any internal dissy, then it has to be timing.
look where the starter goes and see if there is a timing mark in the starter hole like a stovebolt 6 chevy.
The finger in the hole approach will get you on comp stroke, and the feel of rocking the crank will get you @ TDC as you feel it get easier to turn, as you prolly know.
If the head says 1-3-4-2 then prolly that is right.
try 1-4-3-2,-- hell you tried everything else.
Most inline engines I've seen are front to back numbered, with flywheel being #4
But also try assuming #1 is in the back.
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Old 12-05-2018, 01:19 PM
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Quote:
Originally Posted by ol'George View Post
But also try assuming #1 is in the back.
Yeah.. tried it all different ways. Looked in starter hole.. no marks. I had it about as close as I could to TDC as possible with out actually seeing it. Certainly close enough that I could adjust by rotating the distributor. Still nothing. When I set it like that its sooooo close to running. It even fooled me once and I thought it was idling but died out when I let go of the key.

Im starting to wonder if its not fuel related. It's propane tho and the solenoid is operating and flowing gas. I might have to put a pressure gauge inline to double check but I smell plenty of propane.
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Old 12-05-2018, 02:29 PM
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Other than the distributor, you didn't disassemble any wiring that may have affected the run circuit?
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Old 12-05-2018, 03:13 PM
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Other than the distributor, you didn't disassemble any wiring that may have affected the run circuit?
Run circuit is good. We did rewire everything but its a pretty basic system. Coil and electronic ignition is powered by "I" run circuit from key switch. Coil and pickup continue to get power in run position and during crank.
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Old 12-05-2018, 04:40 PM
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My BIL's 4 cyl IH firing order was 1,2,3,4,,,, shocking,,

I had tried everything else, so I wrote EVERY possible wire combination on a piece of paper,,
the first one was 1,2,3,4,,, I did not have to try another combination,,


If the electronic aftermarket ignition is like some,,
the points are still used,, and they need cleaning,,,
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