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Old 07-18-2003, 07:21 AM   #1 (permalink)
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of Dizzy's and Timing Chains

Does anyone know the advance range of the vacuum style distributors? I have been getting the dreaded out of time symptoms,(feels almost like 20deg off) and low and behold, if I pull the line off, it runs!

Just trying to get a guestimate before I panic. I could deal with 6 or so degrees of chain slack, but bunches, well thats bad.

j
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Old 07-18-2003, 02:19 PM   #2 (permalink)
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buehler?!!!???

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Old 07-18-2003, 09:31 PM   #3 (permalink)
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The only info I can give you is for the low and high CR 3.9's in the 94-95 Disco's...however, the specs should be the same as the 3.9 was used in the Disco's overseas since '90 (???)...


All vacuum disconnected, at idle:

2 deg BTDC - low CR
4-5 deg BTDC - high CR


Centrifugal advance between 1400-2200 rpm, vacuum disconnected:

6 - 8 deg advance

so timing should be:

8-10 deg BTDC - low CR

10-13 deg BTDC - high CR


And, of course, check to see if the vacuum diaphragm is working (and that the hose is on the "advance" side of the vacuum bell ). Sorry, I can't find any info on the range of advance via vacuum in my shop manual.
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Old 07-19-2003, 05:43 AM   #4 (permalink)
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Yeah,

I couldn't find it either.

thanks Paul.

I haven't even scoped it yet. I just find it amazing that the chain could have stretched so far in such short time.


j
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Old 07-19-2003, 08:25 AM   #5 (permalink)
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Paul?

Sheesh...I'm not wanted anywhere...
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Old 07-19-2003, 01:08 PM   #6 (permalink)
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Quote:
Originally posted by DieLucas!
Paul?

Sheesh...I'm not wanted anywhere...
Neither am I!
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Old 07-21-2003, 11:27 AM   #7 (permalink)
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Quote:
Originally posted by PTSchram


Neither am I!
As if you guys needed proof I am space cadet.

Well, i found that the timing was about 6 degrees off. But the moral of the story is NEVER assume.

I figured that there couldn't be anything wrong with the other ignition components since they were under a year old.

Well, I reset the timing and off I go to the mountains. Starts running worse under more load (19% grade). Pull cap-n-rotor in lot, and find that the rotor is scarred, and the contacts are all scarred. Not worn down mind you, just cheap ass arc material. Also found a arcing coil wire with my finger... (ouch) under load, (simulated by having cohort load up the torque converter).

Never ever assume....

j
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