timing notches info needed - JeepForum.com
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post #1 of 5 Old 09-02-2002, 04:39 AM Thread Starter
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timing notches info needed

i have an 86, 258. on the timing cover i cannot see any indication where 0 tdc is. there are hash marks, but no numbers. from the bottom, the first hash mark is short the second is long and it keeps alternating. Does anyone know where the 0 starts, is it the first long mark. then how is numbered, is each long hash sequence of 2. thanks kent

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post #2 of 5 Old 09-03-2002, 07:17 PM
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the longer notches are in 4s I believe. The numbers are there, but they're up underneth where you can't see them. The first long notch is 4 then 8 up to 24 if memory serves me correctly. That's all "before" TDC. Hope that helps.
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post #3 of 5 Old 09-03-2002, 10:45 PM
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My Haynes Repair manual shows the large lines as 2 degrees each. The first one is 2 degrees after TDC, then 0, then 2,4,6,8, (BTDC) and so on.

2004 Rubicon, 6" lift, 35s, winch, hard top, full doors, bumpers, tire carrier and rock sliders.
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post #4 of 5 Old 09-06-2002, 04:55 PM Thread Starter
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i looked at the haynes manual also, and it read "typical" and i just wanted to double check. if anyone else knows, i would like to just verify. thanks for the info. these boards are so helpful.
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post #5 of 5 Old 09-07-2002, 11:08 AM
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I just changed my timing chain, but before I took all that off, I cleaned off the notches with a rag and used a little mirror to read it. I would highly recommend doing that to be certain.

If your out of "time" you may need to change your timing chain and gears, there is two ways to check it.
1) if you holding your timing light and the notch on the harmonic balancer is "bouncing" up and down, you may need to replace
2)pull off your distributor cap and put a 3/4 wrench on you crankshaft, turn it clockwise and watch the rotor, turn it counter-clockwise and see how much slack is in your chain before the rotor turns back the other way, there shouldn't be hardley any at all maybe about 5 degrees on the crankshaft tops.

Last edited by jonesmatty; 09-07-2002 at 11:13 AM.
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