Default Timing and Harmonic Balancer 

Old 04-01-2010, 10:09 AM   #1
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My 1985 CJ sputters when turning off the key. I can only reach 50mph when going downhill. I found the distributor bolt very loose, so I think I've got a timing issue. I borrowed a timing light, but I'm not sure where to point the strobe. Is it the harmonic balancer? Is that in front of the block? Any images? 1985 CJ I6.

 

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Default Re: Timing and Harmonic Balancer 

Old 04-01-2010, 11:11 AM   #2
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There is a mark (line) on the balancer and a graduated plate on the front of the engine. You want to rotate the distributor until the mark on the balancer lines up with the correct ignition timeing for your I6. Probably around 5 degrees before top dead center (with the vacuum line disconnected from your distributor). Could be different if there are any modifications - I'm not very knowledgeable on the I6 specs.

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Default Re: Timing and Harmonic Balancer 

Old 04-01-2010, 11:48 AM   #3
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This is exactly what you're shooting at with your timing light:



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Default Re: Timing and Harmonic Balancer 

Old 04-01-2010, 12:09 PM   #4
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Well TD to the rescue
I mean where else but at Jeep-CJ.com do you finf guys that go that much out of the way to help you out.
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Default Re: Timing and Harmonic Balancer 

Old 04-01-2010, 12:10 PM   #5
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Thanks for the replies. I see the image showing the "notches." Should they be numbered? I was under the impression the notches count up from zero in both directions. The image is very useful. Thanks again.

 

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Default Re: Timing and Harmonic Balancer 

Old 04-01-2010, 01:00 PM   #6
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The second little tick mark from the tube thingie (which is actually a socket for a special timing tool none of us will ever see) is 0. To the left is BTDC (before top-dead-center), which is where you want to go. Each tick mark is two degrees; in that bottom photo you can barely see the bottom end of the 20BTDC mark. YOU will want about 9 degrees BTDC, so set it between the 4th & 5th tick marks. That's with the vacuum hose pulled off the distributor & plugged and the engine idling. If you get detonation ("rattle") on acceleration, back it up to 7 degrees.
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Default Re: Timing and Harmonic Balancer 

Old 04-01-2010, 01:03 PM   #7
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Each notch is 2 degrees and the notch farthest to the drivers side is 0 or Top Dead Center (TDC).
My book says you should be at 9 degrees before TDC
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Default Re: Timing and Harmonic Balancer 

Old 04-01-2010, 02:38 PM   #8
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Quote:
Originally Posted by TDHofstetter View Post
The second little tick mark from the little tube thingy is 0.
Quote:
Originally Posted by IOPort51 View Post
Each notch is 2 degrees and the notch farthest to the drivers side is 0
Ok guys which is it.?
And why would AMC make it so confusing?
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Default Re: Timing and Harmonic Balancer 

Old 04-01-2010, 03:10 PM   #9
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Quote:
Originally Posted by IOPort51 View Post
Each notch is 2 degrees and the notch farthest to the drivers side is 0 or Top Dead Center (TDC).
My book says you should be at 9 degrees before TDC
From the FSM:


 

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Default Re: Timing and Harmonic Balancer 

Old 04-01-2010, 03:59 PM   #10
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AMC wasn't confused I was.
I should have said"the one that says 0"
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