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Discussion Starter · #1 · (Edited)
Been restoring an 88 Prelude SI 5speed D2J5 for a family of a friend who passed away 20 years ago. They let it sit for 8 years and rats trashed it. Anyway long story short, the car will go in to gear just fine when the car is off, but will not go in to gear when the car is running.
Master, slave, clutch, pressure plate and throwout bearing is all new and the flywheel was resurfaced by a machine shop.
I purchased a used trans from a junkyard since the original D2J5 had a hole in it. Only info on the junkyard car it came out of was an 88, so I could have gotten a D2J5 or D2J4 I guess....
Exhausted all the troubleshooting I could before I decided to drop the trans. The only issue we could find was maybe with the flywheel. Does the 88 Prelude flywheel have a raised surface in the middle where the clutch touches?
For example, this first picture is of a random flywheel but it shows the raised surface I am talking about...I highlighted it in the red rings.
The second picture is my flywheel on the car now...see how it has no raised surface? Did the machine shop screw me over and machine that raised surface off which is why my clutch won't engage and disengage? You can see the clutch wear a bit on the flyhweel, that's where I feel like the raised surface should be...
I guess I didn't take before pictures of the flywheel before I took it to the machine shop and doing endless searches trying to find an 88 Prelude OEM flywheel is driving me crazy. If this flywheel is the issue, I guess I cannot use any B series flywheel on the B20? From this post it looks like I can only use a 90-91 Integra flywheel and clutch, "so the 88-89 d2j5 preludes can use 90-91 integra b18a1 clutch kits." https://www.preludepower.com/threads...ptions.350196/.
 

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Discussion Starter · #2 · (Edited)
Another post I found "Simple rule of thumb here. You can use any 3rd gen engine with any 3rd gen transmission. They will bolt up fine. You just have to keep the flywheel, clutch, and pressure plate with the transmission you intend to use." https://www.preludepower.com/threads...ywheel.284511/.
With that said, I have a D2J5 flywheel and I could have gotten a D2J4 trans from the junkyard. I guess I need to test a D2J4 flywheel? Anybody know if they are thicker or stick out more because it does not seem like the throwout bearing is touching the pressure plate much at all, which is why my clutch won't engage/disengage.
 

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Discussion Starter · #3 ·
Doing more research....gold sticker on what I assume are USDM trans, the D2J4 and D2J5 housings look the same so I cannot determine what trans I bought to know what exact flywheel to get...
Can't seem to find a D2J3 to see what the housings look like...
 

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Correct, all 3rd gen prelude engines and transmission all bolt up with proper mounts etc. But when it comes to the transmissions, you have to use the flywheel and clutch and pressure plate for the intended transmission you are using. If not, it will have issues.
 

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Discussion Starter · #5 ·
Correct, all 3rd gen prelude engines and transmission all bolt up with proper mounts etc. But when it comes to the transmissions, you have to use the flywheel and clutch and pressure plate for the intended transmission you are using. If not, it will have issues.
Appreciate the reply
I've read that plenty of times but I just cannot figure out what exact trans I bought. The junkyard tag says it's an 88 but no VIN to identify it exactly. While trying to identify it the best I can, it looks like both the D2J5 and a D2J4, so I am unsure what to purchase exactly. Obviously I have a D2J5 flywheel so I ordered this clutch kit UF PREMIUM CLUTCH KIT 1988-1989 HONDA PRELUDE S Si 4WS COUPE 2.0L SOHC DOHC 4CYL | eBay. The clutch fits the input shaft, so the trans I have is definitely 88-89 because the input shaft is different on 90-91. Do the clutches/PP differ in size/thickness? I just don't understand if the flywheel is wrong or if the clutch kit is wrong, or both...or should I just buy a 90-91 integra full clutch kit with flywheel and see if that works? Why does a 90-91 flywheel and clutch kit supposedly work on all 88-89 transmissions when my flywheel from an 88 D2J5 and a clutch kit made for 88-89 won't work....just doesn't make much sense.
I see there is flywheel shims, should I try these to get the length/thickness I think is needed here?
 

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No you dont need shims. You have an issue possible with that throw out bearing. Replace it again, or check to see if your slave cylinder is actually fully engaging the throw out bearing. Thats your issue.
 

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Discussion Starter · #7 ·
No you dont need shims. You have an issue possible with that throw out bearing. Replace it again, or check to see if your slave cylinder is actually fully engaging the throw out bearing. Thats your issue.
We have bled the system many times and I can see the slave pushing on the clutch fork. I am not entirely sure if the throw out bearing is engaging/disengaging or not, seems to me like it isn't and that might be the problem. I can see wear marks on the PP fingers where the TO bearing was touching it...just doesn't seem like the TO bearing is getting pushed in far enough to engage/disengage the clutch...
Clutch cable? You mean the clutch pedal that attaches to the master? I adjusted the rod all the way out in which I would assume would give me maximum slave travel to push the clutch fork out as far as possible...if that makes sense.
But what exactly is the problem ya know....is it my flywheel being machined down to far (can't find pictures of OEM D2J5, D2J4, or D2J3 flywheels to compare), throwout bearing wrong size, clutch and or PP. Wish I could figure out which piece was wrong so I could buy that piece and be done. I bought a flywheel and clutch kit for a 90-91 integra today so going to see if that works I guess because I've been reading forums and looking at pictures for 4 days straight now, i'm burnt out
 

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No clutch cable, our system is hydraulic not cable. The slave cylinder on the outside of the tranny in the front, if its not pushing the fork all the way or if the fork is bent, that is why your throw out bearing is not fully engaging.
 

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Discussion Starter · #9 ·
No clutch cable, our system is hydraulic not cable. The slave cylinder on the outside of the tranny in the front, if its not pushing the fork all the way or if the fork is bent, that is why your throw out bearing is not fully engaging.
Yeah 88-89 is hydraulic, figured you knew that and was talking about something else.
Fork is definitely not bent, I can send a pic of it tomorrow if needed.
Here is what I said in a different forum that is trying to help out too:
Everything installed like a normal clutch job, nothing out of the ordinary at all and everything fit up correctly. Clutch was aligned properly and the trans slid on and bolted up just fine (all of it was done with the swap outside of the car).
I'm trying to figure out a way to explain it, I honestly think nothing is wrong with the master or slave...it's an issue with the 'thickness', I guess that's the best word I can find, of either the flywheel, clutch disc, PP or throwout bearing or all of it. Like if the flywheel was 'thicker', it would push the clutch towards the throwout bearing more and the throwout bearing would make better contact with the PP, which in turn would engage/disengage the clutch better. Hopefully that makes sense...
I just feel like the machine shop screwed me and shaved a lot off of my flywheel, or I bought the wrong clutch...That's why I was hoping someone would point out a definite issue with either of those so I could get a new flywheel or a new clutch ya know...
 

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Well, we dont know if the flywheel is within spec, and you are sure of the throw out bearing not being bad and all else is good. Then a new flywheel might need to replace that one.
 
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