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post #1 of (permalink) Old 02-19-2003, 08:17 AM Thread Starter
 
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no start after timing chain

87 YJ 4.2 Since replacing my timing chain and gears I, first, had immediate start up with a knock. Upon reinspecting I notice my rotor facing away from #1 and removed and reinstalled the distributor accordingly after bringing #1 to TDC corresponding with the timing mark and visual confirmation of the piston through the spark plug hole @ #1. NOW... turns over but doesnt run. My timing light doesnt even seem to light up when cranking... I'm stymied. Any suggestions on where to direct my attention would be appreciated. Feel free to explain as if I was an idiot. [img]images/graemlins/AR15firing.gif[/img]
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post #2 of (permalink) Old 02-19-2003, 05:50 PM
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Re: no start after timing chain

FIrst, start over. Go back and pull the cover and MAKE SURE that the marks are lined up. Then make sure it's at TDC and that the rotor is at the #1 spot on the cap.
What was the reason for the timing gear swap? Did it run before? If it did then you have something misqued on the install you did.
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post #3 of (permalink) Old 02-19-2003, 10:39 PM Thread Starter
 
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Re: no start after timing chain

When timing my engine prior, I noticed the mark jumping ten to twenty(possibly more) degrees from steady and I had clattering noises coming from the front of my engine. Upon disassembly and inspection it was horrifically obvious what the cause was... A badly gnarled and worn camshaft gear. Remarkaby, it was chewed to some degree more on one side than the other. And the teeth looked more like splintered nubs. When my mechanic did the engine swap... he apparently managed to do something funky because the mark was 180 degrees off the factory scribed mark. It appears maybe I have done the same thing? I'm thoroughly confused as what to do with my distributor. Does the #1 piston make only one or two revolutions during the 360 degree rotation of the timing pulley? I'm extraordinarily dense and dim witted so I apologize for having to ask. [img]images/graemlins/tongue.gif[/img]
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post #4 of (permalink) Old 02-20-2003, 09:31 AM
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Re: no start after timing chain

1. You're getting very lost in details...
2. You need to stop and think...
3. Look in the valve cover oil hole...
4. Watch the valves....
5. When both valves are closed...
6. AND you put your finger in the #1 plug hole,
7. AND you start rotating the eingine by hand...
8. You should be feeing pressure building up on your finger when
9. The compression stroke happens.
10. Then you know you're in the ball park!
11. Now you don't time the engine so the distributor rotor aims a the #1 tower,
12. When at TDC of the compression stroke.
13. That would mean that the spark would occur at that time...
14. You time at about 6* before top dead center (BTDC).
15. Otherwise you'll have power loss and possible backfiring and knocking.
16. So,
a. Reconfirm the valves and crankshaft are correctly timed together,
b. Then STATICALLY re-time the distributor to 6* BTDC of the #1 cylinder power stroke.
17. Come back with the results....
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post #5 of (permalink) Old 02-20-2003, 10:17 PM Thread Starter
 
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Re: no start after timing chain

ok.... I worked late tonight and I may not be able to do this until tomorrow evening... poo! By the way... is there an easier way to the #1 plug>? My damn AC compressor, which is the only piece left of the unit is in the way like I can't believe. I've learned to hate it so over the past eight years. Isn't there a welder or compressor or something I can put there to replace this useless spacehog? and am I the only one that has to take off his radiator fan to get a decent shot at his crankshaft pulley bolt>>? Could I be whining too much? [img]images/graemlins/cussing.gif[/img]
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post #6 of (permalink) Old 02-21-2003, 12:26 AM
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Re: no start after timing chain

Simple little trick - if it's difficult to get to number 1 -
The cylinder directly across the cap comes up to TDC at exactly
the same time. Pull that one and proceed, just remember it's
180 out.
You can use that cylinder for your timing light if it's easier
too.

And - popular belief is when the timing marks on the gears
are aligned (close together) it's on #1's compression stroke
- no! At that point it's on the backside of the cam, overlap,
not compression.

For every one turn on the cam gear, the crank gear turns
twice.

Another easy way - align the mark on the pully to what it should
be timed to, like 6 or 8. Wire the cap with number #1 wire
directly over the rotor.
You have a 50/50 chance of being right or 180 out.

If it backfires and flashes back when you try to start it,
simply move each plug wire to the position directly across
the cap, one at a time. Now it's right.

Books show #1 in a certain position on the cap, like toward
the valve cover etc, but it makes no difference which
terminal you use as #1, as long as the rotor agrees.
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post #7 of (permalink) Old 02-21-2003, 09:10 AM Thread Starter
 
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Re: no start after timing chain

I'm no dullard, but words to express my appreciation for these invaluable pieces of information don't exist. I'm speechless. These little tricks and tips that people on this forum give me blow my mind. A thousand thank you's! [img]images/graemlins/laugh.gif[/img]
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post #8 of (permalink) Old 02-21-2003, 04:59 PM
 
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Re: no start after timing chain

Does that mean you fixed it????? [img]images/graemlins/RockOn.gif[/img]
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post #9 of (permalink) Old 02-22-2003, 10:31 PM Thread Starter
 
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Re: no start after timing chain

Well... I switched all my plugs to the tower directly across and instead of hooking my timing light on the #1 cylinder plug wire, I hooked it up to the #6 and my baby started right up. She was coughing a bit from the prior attempts to start her 180 degrees off but she shook it off and now she's purring... and I mean PURRRRRRING! I'm so pleased I could crap myself and not notice. Next dumb question.... Since my timing mark is aligned with the #6, am I going to fail emissions if and when the smog guy insists that it has to be timed from the #1 plug wire>? Could they be so cruel? I'm going to go listen to my baby idle a bit. Thank you forum geniuses!!! [img]images/graemlins/40BEER.gif[/img]
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post #10 of (permalink) Old 02-22-2003, 11:59 PM Thread Starter
 
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Re: no start after timing chain

uh.... I used the #1 and it timed off the factory mark also... now I'm confused. At TDC the rotor is on #6. I shouldn't argue with success. [img]images/graemlins/censor.gif[/img]
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