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88 Prelude SI will not go in to gear when car is on. Flywheel issues?!?

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jermo537 Morocco
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Joined: 08 Aug 2022, 08:20
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88 Prelude SI will not go in to gear when car is on. Flywheel issues?!?

#1

Post by jermo537 » 08 Aug 2022, 08:22

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/.

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.


Random flywheel showing raised edge for clutch:
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s-l640.jpg (55.29 KiB) Viewed 241 times

The flywheel in my car without a raised edge:
output_image1659756627238.jpg
output_image1659756627238.jpg (63.8 KiB) Viewed 241 times

jermo537 Morocco
Posts: 4
Joined: 08 Aug 2022, 08:20
Mood:

Re: 88 Prelude SI will not go in to gear when car is on. Flywheel issues?!?

#2

Post by jermo537 » 09 Aug 2022, 06:04

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...

jermo537 Morocco
Posts: 4
Joined: 08 Aug 2022, 08:20
Mood:

Re: 88 Prelude SI will not go in to gear when car is on. Flywheel issues?!?

#3

Post by jermo537 » 09 Aug 2022, 22:27

Got a reply on another thread "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."

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 https://www.ebay.com/itm/154306739409. 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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