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Ignition timing

IH CUB Lo-Boy Series - 154, 184, 185 Forum -- Questions and answers to all of your Lo-Boy related issues.
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Rcpilot
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Zip Code: 42303

Ignition timing

Postby Rcpilot » Sun Jul 20, 2014 6:38 pm

Cub. 154 lowboy with all new ignition parts including coil and plug wires. Tried to set timing and the timing marks on pulley are at about 10 o'clock and the pointer is at 2 o'clock. I advance the distributer to move timing marks toward pointer and engine starts to run rough and then quits at about the 12 o'clock position. Engine runs good at 10 o'clock position. Why is the timing indicators off so bad? Yet the engine starts and runs great but it does get hot!!!! After about 30 minutes

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Eugene
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Re: Ignition timing

Postby Eugene » Sun Jul 20, 2014 6:54 pm

Distributor is not correctly timed to the engine. Distributor is off a tooth or two.

Rotate engine over until the rotor points to the #1 plug tower on the distributor cap. Then set engine on #1 cylinder TDC, pointer and TDC pulley mark aligned.

Mark the #1 spark plug wire on the distributor case. Remove the distributor. Now reinstall the distributor so half way #1 and #2 plug wire terminal is straight up and that the rotor is pointing at your mark on the distributor case. May take 2 or 3 tries to get it right.

At this point you can static time your ignition to engine.
I have an excuse. CRS.

Rcpilot
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Re: Ignition timing

Postby Rcpilot » Sun Jul 20, 2014 8:32 pm

Thanks I will give this a trym. Also does the12 volt coil that I purchased need to have a resistor either internal or external?

Eugene
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Re: Ignition timing

Postby Eugene » Sun Jul 20, 2014 8:36 pm

Rcpilot wrote:Does the12 volt coil that I purchased need to have a resistor either internal or external?
Yes, one or the other. Needs the resistor.
I have an excuse. CRS.

Gary Dotson
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Re: Ignition timing

Postby Gary Dotson » Mon Jul 21, 2014 7:20 am

I've encountered your issue before. The 154 has a starter/generator and a fairly large front pulley. This puts a lot of strain on the key in the pulley, they sometimes shear and the timing mark gets out of whack.

outdoors4evr
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Re: Ignition timing

Postby outdoors4evr » Mon Jul 21, 2014 7:38 am

Agree with Gary, the key (or the front pulley) is probably worn or broken. (My 184 had 1/3 the key worn away)
Pull the front (#1) spark plug to find the actual top dead center of the compression stroke. Then static time the distributor. (rotor should be pointing at 1:00). Connect the front (#1) spark plug wire to the distributor post that is at 1:00. Going clockwise to 4:00, connect spark plug wire #3. Moving clockwise again (now near 7:00) connect the rear (#4) spark plug wire. Finally, connect the #2 plug wire into the 10:00 position.

I would recommend checking out the front pulley situation before using a timing light. The pulley notches may be leading you astray.
184 w/ Creeper & 3-Point
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Rcpilot
5+ Years
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Joined: Thu Jul 10, 2014 8:59 pm
Zip Code: 42303

Re: Ignition timing

Postby Rcpilot » Mon Jul 21, 2014 9:43 am

Thanks for the info !!!! I will check the pulley


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