Replacing distributor cap and rotor... different design? - JeepForum.com

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post #1 of 17 Old 02-08-2010, 09:00 AM Thread Starter
XJelvis
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Replacing distributor cap and rotor... different design?

We finally had a sunny day last week with temps above 30, so I got to work on installing the Crown tune up kit for my 94 YJ.

When I was putting the rotor on, I noticed the new one was a different design than what was already on there. The original one had a tab to keep it from sliding around, and the new one lacks that tab. Also, the new one doesn't fit as snugly on the post/shaft.

I'm no engine expert, so I left the original one in place. It looked to be much better quality. What do you think, is the new one fine or is it the wrong part?

(The gray one was on there, the black one is the new one from the kit.)






94 YJ, 2.5L, 5sp Sold.
97 TJ, 4.0, 5sp Sold.
01 XJ, 4.0, Auto
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post #2 of 17 Old 02-08-2010, 09:16 AM
baddkarmaracing
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i just changed mine and the original (i think) and the new one were identical to the black one

95 YJ: all stock :( many things coming though. any suggestions ???
04 Ford F-250: 35's, tuned, exhaust, intake. <==== it runs pretty good hehe
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post #3 of 17 Old 02-08-2010, 09:25 AM
sdowney717
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if it is not broke then
whats wrong with the old one, nothing.
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post #4 of 17 Old 02-08-2010, 09:37 AM
moonshinefuel
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It is the wrong part, that's all. There are two different designs. Happens to me sometimes, they will always get the cap right, but there were 2 different designs for the rotors.
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post #5 of 17 Old 02-08-2010, 10:25 AM Thread Starter
XJelvis
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Quote:
Originally Posted by sdowney717 View Post
if it is not broke then
whats wrong with the old one, nothing.
The YJ is new to me so I'm just going through replacing things

94 YJ, 2.5L, 5sp Sold.
97 TJ, 4.0, 5sp Sold.
01 XJ, 4.0, Auto
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post #6 of 17 Old 02-08-2010, 10:26 AM Thread Starter
XJelvis
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Quote:
Originally Posted by moonshinefuel View Post
It is the wrong part, that's all. There are two different designs. Happens to me sometimes, they will always get the cap right, but there were 2 different designs for the rotors.
You think Quadratec would send me the other design if I asked? The gray one is actually the one pictured on their site in the 94-95 kit. No biggie though, it's working fine.

Thanks for the replies

94 YJ, 2.5L, 5sp Sold.
97 TJ, 4.0, 5sp Sold.
01 XJ, 4.0, Auto
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post #7 of 17 Old 03-27-2010, 05:11 PM
tkwok
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I just purchased a new rotor from my local Kragen and it looks like the grey one on the right. The one that is currently in my Jeep looks like the black one on the left. I double checked the parts number on kragen's website and it matches the one I purchased. Any ideas?
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post #8 of 17 Old 03-27-2010, 05:20 PM
Neo1130
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Quote:
Originally Posted by sdowney717 View Post
if it is not broke then
whats wrong with the old one, nothing.
It's called "preventative maintenance."
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post #9 of 17 Old 03-28-2010, 08:48 AM
95 Lowbuck
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I've got a 95 with a 2.5, bought a crown kit and had the same problem.
Had to buy it from a dealer about an hour and a half away and had it shipped.
Mine ended up being the black one so I bought matching Cap and Rotor locally.
Which is the way they should be bought becuase if you look real close,
at the end of the rotors, it does not have the same sweeping radius.
It will create an incorrect gap between the Cap and Rotor if not
bought in sets.
The crappy part of this whole story is nethier the dealer or crown
made any attempt to investigate or fix this problem when contacted.

Last edited by 95 Lowbuck; 03-28-2010 at 09:02 AM.
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post #10 of 17 Old 03-28-2010, 03:35 PM Thread Starter
XJelvis
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Quote:
Originally Posted by tkwok View Post
I just purchased a new rotor from my local Kragen and it looks like the grey one on the right. The one that is currently in my Jeep looks like the black one on the left. I double checked the parts number on kragen's website and it matches the one I purchased. Any ideas?
I'd use it. At least in my Jeep, that style fits so much better and is sturdier. Who knows, maybe the one in there now was a crappy one from the Crown tune up kit installed by a previous owner?

94 YJ, 2.5L, 5sp Sold.
97 TJ, 4.0, 5sp Sold.
01 XJ, 4.0, Auto
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post #11 of 17 Old 03-28-2010, 04:24 PM
laybackman
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Quote:
Originally Posted by XJelvis View Post
We finally had a sunny day last week with temps above 30, so I got to work on installing the Crown tune up kit for my 94 YJ.

When I was putting the rotor on, I noticed the new one was a different design than what was already on there. The original one had a tab to keep it from sliding around, and the new one lacks that tab. Also, the new one doesn't fit as snugly on the post/shaft.

I'm no engine expert, so I left the original one in place. It looked to be much better quality. What do you think, is the new one fine or is it the wrong part?

(The gray one was on there, the black one is the new one from the kit.)



There are two different type of distributers used on YJ's One type I believe is nippon denso and then there is another type. It may be on a laberl on the side of the distributer. The rotor and caps are not intechangable. Support your local parts store for these items and avoid all the delays and problems.

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post #12 of 17 Old 03-28-2010, 05:09 PM Thread Starter
XJelvis
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Quote:
Originally Posted by 95 Lowbuck View Post
I've got a 95 with a 2.5, bought a crown kit and had the same problem.
Had to buy it from a dealer about an hour and a half away and had it shipped.
Mine ended up being the black one so I bought matching Cap and Rotor locally.
Which is the way they should be bought becuase if you look real close,
at the end of the rotors, it does not have the same sweeping radius.
It will create an incorrect gap between the Cap and Rotor if not
bought in sets.
The crappy part of this whole story is nethier the dealer or crown
made any attempt to investigate or fix this problem when contacted.
Quote:
Originally Posted by laybackman View Post
There are two different type of distributers used on YJ's One type I believe is nippon denso and then there is another type. It may be on a laberl on the side of the distributer. The rotor and caps are not intechangable. Support your local parts store for these items and avoid all the delays and problems.
This is how I'll be doing it from now on

94 YJ, 2.5L, 5sp Sold.
97 TJ, 4.0, 5sp Sold.
01 XJ, 4.0, Auto
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post #13 of 17 Old 03-29-2010, 07:56 AM
Fernando
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Since you are performing maintenance on your ignition system, I would recommend that you look into the Team Rush mod, this basically replaces your stock coil with a more powerful one and your distributor cap, rotor and wires with larger, better quality parts.

I would not recommend using those black rotors and caps, I have learned from a very reliable source that those contain carbon ( to make them black ) which is conductive and leads to misfires and spark problems.

I believe all YJ owners should do the Team Rush mod, the stock ignition system on our Jeeps is extremely limited and even if you install all new parts, will never perform as good as with the Team Rush, just my two cents!


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post #14 of 17 Old 03-29-2010, 08:06 AM
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My '94 has the black rotor type and the '93 core engine I bought had the gray rotor type sensor. The only difference is in the way the cam sensor is mounted. The later distributor (black) has the hall effect sensor mounted on a piece of flimsy plastic right under the cap. When inspecting my '94 (black) I noticed that the sensor had been rubbing the metal ring (mounted to the shaft, the part that moves through the sensor) which I attribute to the plastic mounting plate deforming with age.

I have decided to go back with the '93 (gray) because it is mounted more securely. The main advantage of the '94 (black) is that you would not have to remove the dist to replace the sensor but that is a minor convenience for me, i like the rugged way the '93 (gray) is designed, there is no way for the sensor to move.
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post #15 of 17 Old 03-29-2010, 08:20 AM
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Quote:
Originally Posted by Fernando View Post
Since you are performing maintenance on your ignition system, I would recommend that you look into the Team Rush mod, this basically replaces your stock coil with a more powerful one and your distributor cap, rotor and wires with larger, better quality parts.
Team Rush mod for a 4.0 liter? I think that's only for the 4.2

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SOA, 5100 Bilstein, TJ Flares, 35" BFG AT, 8.8, SYE, D30 truetrac/chromo, 1" MML
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