Timing Chain or Distributor? - JeepForum.com
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Unread 10-24-2010, 01:00 PM   #1
brentd711
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Timing Chain or Distributor?

My 1990 2.5L died last week on the way to work. No noises, just quit running at 55 mph. When I tried to restart it would crank, no fire. At times the starter would hiccup and it would pop back through the TB. I'm thinking its the timing chain so I rotated the crank and there's zero movement from the distributor rotor. I really want to avoid pulling the distributor if I can but how do I know for sure that it's the timing chain and not the distributor gear drive without pulling it?

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Unread 10-24-2010, 01:07 PM   #2
4.7stroker
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The only other way would be to pull the front cover. You will still be stuck with the task of ensuring that the timing is correct. Pulling and reinstalling the dizzy is no big deal.

Dwayne
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Unread 10-24-2010, 01:16 PM   #3
jeepnaked89
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you could prob just try to turn the rotor by hand it shouldn't move much if it free spins then you would know, or pull the plugs and turn the engine with a breaker bar look through the oil filler and look for valve train movement
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Unread 10-24-2010, 01:23 PM   #4
brentd711
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Quote:
Originally Posted by 4.7stroker View Post
The only other way would be to pull the front cover. You will still be stuck with the task of ensuring that the timing is correct. Pulling and reinstalling the dizzy is no big deal.

Dwayne
Assumed timing is correct if marks are aligned on timing chain sprockets.

Rotor doesn't spin freely by hand so perhaps that's my sign that it's still engaged?
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Unread 10-24-2010, 03:49 PM   #5
jay-h
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take the valve cover off. See if the valves are operating.
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Unread 10-27-2010, 07:22 PM   #6
brentd711
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Timing chain is good, distributor shaft siezed and cleaned off some teeth. Assume I need to install a new distributor and make sure the timing marks on the sprockets are aligned and rotor points to #1 cylinder?
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Unread 10-27-2010, 07:28 PM   #7
plym49
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If the timing chain is good then there is no reason to think the dots on the sprockets are not aligned.

Just install a new dizzy gear, reinstall the dizzy and align to TDC on #1 on the compression stroke as often described here on the forum. And find out why the dizzy seized and correct.

Your call on whether you need to pull the oil pan to clean out the pieces that fell inside.
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Unread 10-27-2010, 08:08 PM   #8
4.7stroker
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I would be worried about the teeth on the cam, the teeth on the dizzy got wiped out so I would also worry about metal getting sucked up into the oil pump and causing damage there.

Dwayne
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Unread 10-27-2010, 09:45 PM   #9
dodger889
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At least drain the oil through a cloth( strainer) and see how much metal you have in the oil. Personally I would drop the oil pan myself.

Pull the old dizzy out and see if it binding. If it is not binding then you need to look farther than just replacing the dizzy. Examine the cam gear real good. You can do this through the dizzy opening and a good light while you have some one turn the engine over by hand( pull all you plugs) it will take two full rotations of the crank to see all the way around the cam gear.
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Unread 10-28-2010, 03:50 PM   #10
brentd711
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I'm planning on pulling the pan to check for debris and have ordered a reman distributor from Autozone. The distributor shaft was seized...hard. It locked up quick enough to only take about 2 or 3 rows of teeth off the brass gear. The distributor cap was a loose fit and one of the screws was oversized to hold it onto the distrubutor. Probably got enough moisture so the shaft rusted and eventually locked up.

Two questions for the pros...there's a tin shield of some sort on the face of the crank sprocket that seems to be covering the timing mark. Does this pop off so I can see the dot? Can someone explain how you know when the number 1 piston is on the compression stroke?
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Unread 10-28-2010, 05:56 PM   #11
4.7stroker
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This should help you. Pelican Technical Article: Setting 911 Distributor Static Timing

Dwayne
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