reubj Posted January 16, 2014 Posted January 16, 2014 What is the factory air gap between the CPS and the flywheel on an '89 4.0 w/ BA10/5? Thank you.
cruiser54 Posted January 17, 2014 Posted January 17, 2014 There is no spec for that. What are you trying to do?
dasbulliwagen Posted January 17, 2014 Posted January 17, 2014 The ones Ive installed have a piece of cardboard ( not the corrugated kind ) glued to the sensor tip. You install it firmly to the flywheel ring and then the cardboard is ground off leaving the proper gap.
cruiser54 Posted January 17, 2014 Posted January 17, 2014 Never seen that on a Jeep CPS. I have a photo of the air gap and it's waaaaaay bigger than even a corrugated piece of cardboard.
HOrnbrod Posted January 17, 2014 Posted January 17, 2014 Unless you drill out and enlarge the CPS mounting holes, it's a fixed gap. There's very little wiggle room. I just replaced mine with a new Mopar CPS; there was no cardboard on the tip. ASSume it's the same way on the Renix, si?
dasbulliwagen Posted January 17, 2014 Posted January 17, 2014 I must be thinking of some other Chrysler product... maybe the 5.2 5.9?
cruiser54 Posted January 17, 2014 Posted January 17, 2014 I must be thinking of some other Chrysler product... maybe the 5.2 5.9? For sure not a 4.0.
reubj Posted January 17, 2014 Author Posted January 17, 2014 I did the "open-the-mounting-hole" and the "advance mod" on a new NAPA CPS. After I replaced it and started the engine I heard a not-so-loud buzzing sound for about 10 seconds then the noise faded away. Engine ran fine. I was thinking perhaps there was slight contact between the CPS and flywheel. I had also put some duct tape on the plastic cover that the CPS fits thru to keep things from falling thru so maybe a piece of that got shoved thru the hole during installation and was rubbing the flywheel. As a side note, replacing the CPS on a stock '89 MJ 4.0 with BA10/5 is a pain in the tuckus! Detaching the front driveshaft from the front diff and swing it out of the way gave me some additional elbow room. When I did the advance mod the plastic housing developed a faint hairline crack. I encased the plastic in epoxy it before installation. Hope it doesn't cause future problems.
cruiser54 Posted January 17, 2014 Posted January 17, 2014 I did the "open-the-mounting-hole" and the "advance mod" on a new NAPA CPS. After I replaced it and started the engine I heard a not-so-loud buzzing sound for about 10 seconds then the noise faded away. Engine ran fine. I was thinking perhaps there was slight contact between the CPS and flywheel. I had also put some duct tape on the plastic cover that the CPS fits thru to keep things from falling thru so maybe a piece of that got shoved thru the hole during installation and was rubbing the flywheel. As a side note, replacing the CPS on a stock '89 MJ 4.0 with BA10/5 is a pain in the tuckus! Detaching the front driveshaft from the front diff and swing it out of the way gave me some additional elbow room. When I did the advance mod the plastic housing developed a faint hairline crack. I encased the plastic in epoxy it before installation. Hope it doesn't cause future problems. Just drilled the upper hole? I have heard CPSs that touched the flywheel before. It's not "not so loud". Have you checked your CPS output? I also remove the front end of the driveshaft for more working room.
reubj Posted January 17, 2014 Author Posted January 17, 2014 I drilled the upper hole only. Are you saying that CPS touching flywheel makes a substantial noise? In your case did it quiet down pretty quickly or did it continue? I have not yet checked the CPS voltage. Will this weekend. If voltage checks out would you say everything should be good-good?
cruiser54 Posted January 17, 2014 Posted January 17, 2014 I drilled the upper hole only. Are you saying that CPS touching flywheel makes a substantial noise? In your case did it quiet down pretty quickly or did it continue? I have not yet checked the CPS voltage. Will this weekend. If voltage checks out would you say everything should be good-good? Yep. Loud as hell !!! Should be great. Just curious as to the reading you get.
reubj Posted January 17, 2014 Author Posted January 17, 2014 I'll report back with the voltage results.
cruiser54 Posted January 17, 2014 Posted January 17, 2014 Great. I have a photo I'll email to hornbrod and have him post in this thread so you can see the gap.
HOrnbrod Posted January 18, 2014 Posted January 18, 2014 Pete, I was surprised at the size of the air gap. I thought it would be much tighter. Wonder if the HO gap is also as large. :hmm:
cruiser54 Posted January 18, 2014 Posted January 18, 2014 Pete, I was surprised at the size of the air gap. I thought it would be much tighter. Wonder if the HO gap is also as large. :hmm: Interesting, eh?
reubj Posted January 18, 2014 Author Posted January 18, 2014 Very interesting. I was under the impression that the tip was right over the teeth of the flywheel.
cruiser54 Posted January 18, 2014 Posted January 18, 2014 Very interesting. I was under the impression that the tip was right over the teeth of the flywheel. Hang around Hornbrod and me and you'll be exposed to many myth busting things.
Jeep Driver Posted January 18, 2014 Posted January 18, 2014 Very interesting. I was under the impression that the tip was right over the teeth of the flywheel. Hang around Hornbrod and me and you'll be exposed to many myth busting things. I'll bust a myth........ That you can actually index the distributor on a 2.5.........no can do. Pulled mine out tonight.........distributor is fixed.....rotor at 6 Oclock......that's it.
HOrnbrod Posted January 18, 2014 Posted January 18, 2014 It would be nice if you edited your signature to include year, model, engine, etc. for your rig so we'd know which distributor you are referring to.
reubj Posted January 20, 2014 Author Posted January 20, 2014 I checked the new NAPA CPS and got 1.3 - 1.5 VAC while cranking.
cruiser54 Posted January 20, 2014 Posted January 20, 2014 I checked the new NAPA CPS and got 1.3 - 1.5 VAC while cranking. That's great!!!!! You didn't drill the upper hole?
reubj Posted January 20, 2014 Author Posted January 20, 2014 Yes. I drilled the upper hole to 3/8" dia.
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