Ok, here is the deal. My 3rd gear on my Y1 JDM tranny was starting to grind so I pulled the tranny and had the parts 1, 2 and 4 changed from the picture below. Got everything back together as well as a new clutchmasters stage 3 clutch kit and an ACT prolite B-series flywheel.

After the break in period and a few hard shifts on the street, everything was fine. 15 minutes on the track and the 3rd gears starts grinding again, just like before. Bitchin'.

Pulled everything appart again and we discovered that the step on the flywheel was 0.04'' too much wich caused the clutch never to disengage fully. This is being fixed as I write this.

My question is, the actual parts that matches the revs of the gear to that of the shaft (part 2 of picture below) are good as new, they have been checked. I always believed that a gear would grind when those parts were worn out. I guess was wrong. How do you guys see it?

From looking back at everything, I believe what hapenned is that I missshifted in 3rd on the track with the foot down on the gas due to the flywheel-clutch problem described above, which caused the ring (part 1) to be damaged. Then, everytime I would shift, the ring would not seat properly on part 2 and slide right away on the gear (part 3) before the revs were matched, which causes the permanent grind.

Any input on this?

Here are the pics:

 

charjacq... damn boiiii I remember you from way back in the days of purehonda. represent!

 

Damn, you got a good memory!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by charjacq &raquo;</TD></TR><TR><TD CLASS="quote">
From looking back at everything, I believe what hapenned is that I missshifted in 3rd on the track with the foot down on the gas due to the flywheel-clutch problem described above, which caused the ring (part 1) to be damaged. Then, everytime I would shift, the ring would not seat properly on part 2 and slide right away on the gear (part 3) before the revs were matched, which causes the permanent grind.

Any input on this?</TD></TR></TABLE>

Sounds about right to me.

So is the prolite flywheel coming from act machined wrong? I was just about to purchase one and i'd like to know before i do.

 

I don't know if it was machined wrong, but it sure didn't fit with my clutchmasters stage 3. I'll give ACT a call about this as it is costing me a few unnecessary extra hundred of dollars.

The flywheel is the prolite for B-series motor. The step between the friction surface and the surface where the pressure plate mounts was 0.150''. Clutchmasters requires a 0.110'' step. My OEM type-R flywheel seems to have a smaller step also. I'll check with ACT to see what the step is supposed to be.

This is something I would never have thought of, but ended up costing me a lot of money, time. I have a track event tomorrow which I will not be able to make either. I definitively want to find out how was wrong, ACT of clutchmasters.

 

nobody works on trannies here?

 

Those "parts" #2 are called sycronizer sleeves, and they are prone to damage on a B-series transmission. I got the same problem with 3rd gear on my transmission. Try double clutching, if that fixes the problem then it is most likely the sycronizer sleeves. They probable got worn out with your miss matched clutch, causing them to pre-maturely fail.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jurassic Four &raquo;</TD></TR><TR><TD CLASS="quote">Those "parts" #2 are called sycronizer sleeves, and they are prone to damage on a B-series transmission. I got the same problem with 3rd gear on my transmission. Try double clutching, if that fixes the problem then it is most likely the sycronizer sleeves. They probable got worn out with your miss matched clutch, causing them to pre-maturely fail. </TD></TR></TABLE>
and, there's no USDM replacement parts for JDM gearboxes.

 

No, they are not damaged. It's the ring, part 1, that is damaged and which I believe is causing the grind. I just wanted someone else's opinion. The syncroniser rings would cause the grind, but in this case, they are just like new.

 

well any metal to metal gear part that is damaged in some way will cause a grind or cause premature failure of the synchro's ect.... that's my 2 cents from a mild tranny tech... i've rebuilt a few in my time, reused or cannablized other tranny's to do it, w/ no problems as long as all the meshing surfaces aren't damaged, and clearances are maintained.