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Flex Plate, No Start


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#1 knever3

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Posted 06 October 2012 - 05:47 PM

Specs first,

1987 Jeep Comanche had 4.0L 2wd ba-10/5

Installed aw-4 trans, 242 case and all under hood wiring and fuse box from 1990 XJ. Ran fine until I noticed the flex plate knock. Thought it was a rod bearing so I decided to install my stroker motor. '96 block and head, kept all the renix stuff including the flywheel from the last motor, which was from the '90 donor.

After noticing the noise was on the new motor I removed the flex plate and ordered a new one for an '87 Comanche. I noticed that the windows in the outer ring were in different locations than the old one I pulled. Sure enough, installed it and the timing is so far off it won't start. Ordered one for the '90 XJ and it turned out to be the same part.

So the question is which flex plate do I need? I have the renix system but the clue is that the donor XJ had a Chrysler sticker under the hood instead of an AMC one. I am assuming trying a '91? The part has no markings on it so I can't cross reference. The parts aren't a stock item so I would have to order them and match them up.

Thoughts?
Kevin

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'06 Jeep Grand Cherokee 5.7 Hemi
'01 Jeep XJ 60th Anniversary Edition (sold)
'87 Jeep MJ (In Progress)
'90 Jeep XJ 2 door (Donor)
'00 Grand Prix GTP

#2 hornbrod

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Posted 06 October 2012 - 06:14 PM

AW4 FLEXPLATE Part Numbers

1986-90: 33002675
1991-92: 53006324
1993-95: 52117761
1996-01: 52118551

-Don  ooo ___ọọọ_
.___
____,\_____\,__
NOT RENIX‒-‒-[]llllll[]
 ͞  /o﴿_﴿ ̄ ̄ ̄/o﴿_﴿---﴿_﴿

1991 MoparJeep_zps7c8edd13.jpg Comanche LWB, AW4, HESCO 4.6L stroker, 4.09 Dana 44 Trac-Lok, 2.5" lift
Power everything, Ford Explorer rear disks, starseed_zps6deb0e15.gifCHROMEstarseed_zps6deb0e15.gif  freak....spacer.gif
ala_animated.gif
 

When I drive a new Jeep off the lot, it doubles in value.


#3 knever3

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Posted 06 October 2012 - 11:26 PM

Thanks for posting the numbers, but how do I figure out what flex plate to buy if the one it "should" be isn't the correct one? All I can think of is to call the dealer with the vin from the '90 donor and cross reference that to an aftermarket part. Except it's the weekend as uaual. :soap box: I wish dealers had an 800 number you can call for help and a linked computer to the network to see if my closest one had the part. This whole year it seems it's been the weekends when I need something from the dealer. Go figure.
Kevin

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'06 Jeep Grand Cherokee 5.7 Hemi
'01 Jeep XJ 60th Anniversary Edition (sold)
'87 Jeep MJ (In Progress)
'90 Jeep XJ 2 door (Donor)
'00 Grand Prix GTP

#4 hornbrod

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Posted 06 October 2012 - 11:51 PM

Posted the p/n's so hopefully you could troll the net and find pics of each and perhaps determine the correct notch layout you'll need for your application. I'm assuming as you are the 53006324 might be golden with your setup.

-Don  ooo ___ọọọ_
.___
____,\_____\,__
NOT RENIX‒-‒-[]llllll[]
 ͞  /o﴿_﴿ ̄ ̄ ̄/o﴿_﴿---﴿_﴿

1991 MoparJeep_zps7c8edd13.jpg Comanche LWB, AW4, HESCO 4.6L stroker, 4.09 Dana 44 Trac-Lok, 2.5" lift
Power everything, Ford Explorer rear disks, starseed_zps6deb0e15.gifCHROMEstarseed_zps6deb0e15.gif  freak....spacer.gif
ala_animated.gif
 

When I drive a new Jeep off the lot, it doubles in value.


#5 Eagle

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Posted 06 October 2012 - 11:59 PM

Is your ECU located under the dashboard, over the driver's right foot, or under the hood between the air box and the fender? For an '87 MJ (or any Renix) the 33002675 should be the correct part number.

Another question: The '87 4.0L and the '90 4.0L were both Renix models. Why did you install the underhood wiring from the donor? All you should have had to install was the TCU and the associated harness for that.

Are you certain the '90 donor wasn't a '91? Do you still have it, or a record of the VIN number?
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#6 knever3

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Posted 07 October 2012 - 04:18 AM

I still have the '90 donor. The reason is because my '87 was a manual, the '90 was an auto with A/C, both which I wanted. The computer is up under the dash. My '87 had the c101 connector, the '90 did not.
Kevin

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'06 Jeep Grand Cherokee 5.7 Hemi
'01 Jeep XJ 60th Anniversary Edition (sold)
'87 Jeep MJ (In Progress)
'90 Jeep XJ 2 door (Donor)
'00 Grand Prix GTP

#7 mvusse

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Posted 07 October 2012 - 07:42 AM

Computer under the dash is Renix. Maybe the flex plate you ordered for an 87 Comanche is not for an 87 Comanche? And the one you ordered for the 90XJ also isn't?

Would not be uncommon for people (and computers) to think that all parts interchange from 84 right through 92, meaning they gave you one (two) for 91-92 model year with the Chrysler OBD I setup.
87 Comanche Pioneer 4.0 4x4 auto, Wilbur. 6.5" lift, Aussie lockers, Jawz JP Customs winch bumper, XRC10 winch and 35x12.50 Maxxis Mudders. Lots of cutting, lots of rust(holes), lots of dents.
87 Comanche 2.5 4x4 5 speed, The Purple People Eater, stock daily driver.
96 Cherokee Sport 4.0HO, Sparkles. mild lift, 32s, 2wd converted to Selec-Trac. Built for my daughter.

#8 Eagle

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Posted 07 October 2012 - 09:49 AM

Who did you order the new flex plates from, what brand are they (if the box shows a brand), and what's the part number?

AutoZone shows me a flex plate number FRA-333 for an '88 Cherokee 4.0L. They show the same one for a 1990 MJ. Price is $54.99.

For a '92 MJ, they show me part number FRA-480, and the price is $96.99.

If all else fails, Crown uses the same part numbers as Jeep, and their stuff is good quality. My dealer supplies Crown where the factory parts are no longer available (which I'm sure is the case for a Renix flex plate). I think my dealer will ship -- call Todd or Rich at 860-274-8834, ext 3. Tell them Harwood suggested them as the miracle workers and see if they can get you hooked up.
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#9 hornbrod

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Posted 07 October 2012 - 11:39 AM

Try sticking a timing light on it while cranking to see if it syncs with the timing marks on the damper and timing cover. That will tell you a lot.

-Don  ooo ___ọọọ_
.___
____,\_____\,__
NOT RENIX‒-‒-[]llllll[]
 ͞  /o﴿_﴿ ̄ ̄ ̄/o﴿_﴿---﴿_﴿

1991 MoparJeep_zps7c8edd13.jpg Comanche LWB, AW4, HESCO 4.6L stroker, 4.09 Dana 44 Trac-Lok, 2.5" lift
Power everything, Ford Explorer rear disks, starseed_zps6deb0e15.gifCHROMEstarseed_zps6deb0e15.gif  freak....spacer.gif
ala_animated.gif
 

When I drive a new Jeep off the lot, it doubles in value.


#10 Eagle

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Posted 07 October 2012 - 02:44 PM

Try sticking a timing light on it while cranking to see if it syncs with the timing marks on the damper and timing cover. That will tell you a lot.


Considering that the Mopar CPS operates on a completely different theory than the Renix CPS, I'd be surprised if there's any signal at all to trigger a timing light.
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#11 knever3

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Posted 07 October 2012 - 05:51 PM

I called AutoZone today and they put me on hold to help customers in the store, for more than 7 minutes to which I hung up. I tried again at 6pm. The same guy answered and they have one in stock for a '91 for $93.00. Way more expensive than the '87-90 one I had ordered from Advance Auto. I don't remember the part number for those two. So fingers crossed tomorrow I will take my old one to AutoZone to see if it matches up. Hopefully I can talk them down on price too!!

To be continued...
Kevin

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'06 Jeep Grand Cherokee 5.7 Hemi
'01 Jeep XJ 60th Anniversary Edition (sold)
'87 Jeep MJ (In Progress)
'90 Jeep XJ 2 door (Donor)
'00 Grand Prix GTP

#12 knever3

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Posted 08 October 2012 - 02:30 PM

Ok dead end again. The part i had was for a 90. The dealer part numbers crossed to the dorman or atp one i ordered. So i can't find out why the timing is off when i installed it the first time. I am about over this stupid problem, every time ineed to order the part. The 91 was way different, i also checked with the dealer and the part is no longer available through them.
Kevin

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'06 Jeep Grand Cherokee 5.7 Hemi
'01 Jeep XJ 60th Anniversary Edition (sold)
'87 Jeep MJ (In Progress)
'90 Jeep XJ 2 door (Donor)
'00 Grand Prix GTP

#13 mvusse

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Posted 08 October 2012 - 05:46 PM

Has been a long time since I had a flywheel off, and never took a flywheel or flex plate off a Jeep 4.0, so a question: is there a key or something that indexes it to the crankshaft? Or is there more than one orientation to bolt it on.
87 Comanche Pioneer 4.0 4x4 auto, Wilbur. 6.5" lift, Aussie lockers, Jawz JP Customs winch bumper, XRC10 winch and 35x12.50 Maxxis Mudders. Lots of cutting, lots of rust(holes), lots of dents.
87 Comanche 2.5 4x4 5 speed, The Purple People Eater, stock daily driver.
96 Cherokee Sport 4.0HO, Sparkles. mild lift, 32s, 2wd converted to Selec-Trac. Built for my daughter.

#14 knever3

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Posted 08 October 2012 - 06:10 PM

The bolts can only be put in one way. If you rotate the flexplate all of the bolts will only align one way.
Kevin

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'06 Jeep Grand Cherokee 5.7 Hemi
'01 Jeep XJ 60th Anniversary Edition (sold)
'87 Jeep MJ (In Progress)
'90 Jeep XJ 2 door (Donor)
'00 Grand Prix GTP

#15 mvusse

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Posted 08 October 2012 - 07:36 PM

Pull the trans, install your old flywheel, see if it starts to rule out the flexplate. I'm starting to think you may have damaged the cps.
87 Comanche Pioneer 4.0 4x4 auto, Wilbur. 6.5" lift, Aussie lockers, Jawz JP Customs winch bumper, XRC10 winch and 35x12.50 Maxxis Mudders. Lots of cutting, lots of rust(holes), lots of dents.
87 Comanche 2.5 4x4 5 speed, The Purple People Eater, stock daily driver.
96 Cherokee Sport 4.0HO, Sparkles. mild lift, 32s, 2wd converted to Selec-Trac. Built for my daughter.

#16 Eagle

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Posted 08 October 2012 - 08:48 PM

Pull the trans, install your old flywheel, see if it starts to rule out the flexplate. I'm starting to think you may have damaged the cps.


I was thinking the same thing.
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#17 hornbrod

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Posted 08 October 2012 - 09:00 PM

Considering that the Mopar CPS operates on a completely different theory than the Renix CPS, I'd be surprised if there's any signal at all to trigger a timing light.


Doesn't matter - HV to the plug #1 is the same result. The timing light will trigger if the timed HV signal is there thru the mag pickup. It will also tell you if the timing is completely AFU resulting in a no-start condition. I'd rather do this first than pull the tranny and change flexplates. That's nuts.

-Don  ooo ___ọọọ_
.___
____,\_____\,__
NOT RENIX‒-‒-[]llllll[]
 ͞  /o﴿_﴿ ̄ ̄ ̄/o﴿_﴿---﴿_﴿

1991 MoparJeep_zps7c8edd13.jpg Comanche LWB, AW4, HESCO 4.6L stroker, 4.09 Dana 44 Trac-Lok, 2.5" lift
Power everything, Ford Explorer rear disks, starseed_zps6deb0e15.gifCHROMEstarseed_zps6deb0e15.gif  freak....spacer.gif
ala_animated.gif
 

When I drive a new Jeep off the lot, it doubles in value.


#18 cruiser54

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Posted 09 October 2012 - 07:01 AM

I'd be checking CPS output about now. Maybe a while ago.

Cruiser's Mostly Renix Tips (over 25 of them) can be found here: http://comancheclub....ers-renix-tips/

 

 

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#19 Eagle

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Posted 09 October 2012 - 12:31 PM

What CPS is in the truck now? Is the CPS compatible with the flywheel/flexplate?
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#20 knever3

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Posted 09 October 2012 - 06:01 PM

The CPS is new since I put together the truck. I ran it for about 1000 miles I figure. I don't know why the CPS would not read one flywheel and then another. Tomorrow Advance will get in another '90 flexplate. I might take some pics and upload them to give you guys a look. I will also check the CPS for damage when I'm under there.
Kevin

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'06 Jeep Grand Cherokee 5.7 Hemi
'01 Jeep XJ 60th Anniversary Edition (sold)
'87 Jeep MJ (In Progress)
'90 Jeep XJ 2 door (Donor)
'00 Grand Prix GTP