Transmission bearing bad?

  • Thread starter Thread starter d.n
  • Start date Start date
goldNSX said:
Change all of them. They are cheap. Esp. the ones at the ISB and the axles.

Don't you want to put it in ONE thread instead of two?
Click to expand...

I'll keep posting in this now. Originally, I had obviously started my own to clarify things. Then I came across an old thread & bumped it, which is why I now I have two.

All the seals needed for the transmission are listed in those 2 links I posted? I didn't see anymore.
 
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Since I'm considering opening the transmission, I also remember on RARE occasion when shifting from 2nd into 3rd gear at higher RPM that it would grind going into 3rd gear (I haven't redlined my car in years). It's only at higher RPM around 7000RPM or so.

I don't push the car very hard often & it doesn't always give that slight grind. For years I've read about GM's cocktail & saw Batman's recent post about Synchrotech MTF here:
http://www.nsxprime.com/forum/showthread.php/63885-Gear-shift-notchiness/page2?p=1965393#post1965393

If I did want to replace a only synchro for 3rd gear (never ever had issues with any other gears). What specific parts would I order ahead of time? I know once it's opened the shop will see what else needs to be replaced if needed.

Just this?
23646-PR8-020 SYNCHRONIZER SET (79)


*It only happens when upshfting from 2nd to 3rd, there was never an issue would heel/toe/rev matching down into 3rd gear.

I should also clarify by asking. For this issue, is a synchro the only thing that would need to be changed?
 
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If you're about to open the gearbox please forget about the GM's cocktail and do replace the synchro and all parts that are about to replace.

How much time do you give it when you open the gearbox? You'll only see details when you open it. You should be able to get parts much faster than we guys in Europe do. So there's no need to buy possible parts in advance as long you can get them fast.
 
IMO if you're going to open the transmission you might as well do a full rebuild with all new bearings, seals, and synchros. SoS sells a complete kit or you can source the parts yourself and save a ton of money. You're paying a huge amount of labor already, might as well replace all the wear parts and get your money's worth.
 
MotorMouth93 said:
IMO if you're going to open the transmission you might as well do a full rebuild with all new bearings, seals, and synchros. SoS sells a complete kit or you can source the parts yourself and save a ton of money. You're paying a huge amount of labor already, might as well replace all the wear parts and get your money's worth.
Click to expand...

That's what I'm thinking as well.

I am just hesitant because I always wondered if opening up transmission & changing say seals and/or 3rd gear synchro could potentially cause problems. I was just wondering if I change out necessary parts to for the 3rd gear synchro, is there a reasonable chance that it causes issues later on? Meaning, from what I've read, there are tolerances, shims etc right? How easy would it be for a transmission shop or mechanic to have to things slightly the spacing/shims/gap slightly off when re installing? I don't really know what changing gears, synchros entails (although I've quickly read some DIY's)
 
Hand them out a copy of the SM with the relevant pages. A good tech reads it, a bad one not. If they are perfectionists you're in good hands. But there are also some morons out there...so watch out finding the right shop to do that project.
 
S2G-Unit said:
Actually at this moment I'm reading your thread on nsxcb.co.uk.
Click to expand...
So you'll be reading my questions and thoughts and see my faults. :) The problem is that it takes a lot of time to do it according to the manual. You have to find a tech in Canada who is running the extra mile for you. The gearbox construction is pretty simple, just a bigger Civic-gearbox but there are some pitfalls though...
 
goldNSX said:
So you'll be reading my questions and thoughts and see my faults. :) The problem is that it takes a lot of time to do it according to the manual. You have to find a tech in Canada who is running the extra mile for you. The gearbox construction is pretty simple, just a bigger Civic-gearbox but there are some pitfalls though...
Click to expand...

Seems like shims are necessary.

Anybody have parts numbers for those?
 
Not necessarily. There are 20-30 sizes of shims out there and each is $10 or so.

As soon as the gearbox is open you'll see what shims were used from the factory. The tolerances of the gearbox parts are very tight so you won't end up in a completely different range. The wide range of shims is there to compensate for the gearbox housing itself where you have to most tolerances. As long as it is the same the range will be very similar.

It all depends on how you're going to let them work on the tranny.
- order all the parts that you're think are defective
or
- open the gearbox first and order the parts needed

As you're in Canada you should be able to get the parts faster than I did in Europe. In advance you can order the parts you're going to change anyway and decide after opening the gearbox what needs to be replaced unexpectadly.

BTW no.1: the seals are not critical in the NSX gearbox except for the one at the input shaft bearing. A tube of Hondabond does the rest.

BTW no. 2: are you thinking about installing the short gears?

BTW no. 3:
S2G-Unit said:
pretty common problem:
-In Neutral
-Foot off the clutch
-Whirring, marbly noise
Click to expand...
That was one of my three noises I've decided to revise my gearbox/clutch. It happened to be the lower mainshaft bearing in my case. Even when dismounted it was hard to localize the noise but when I've put the mainshaft on a large and thin piece of wood I was able to detect it.
 
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goldNSX said:
Not necessarily. There are 20-30 sizes of shims out there and each is $10 or so.

As soon as the gearbox is open you'll see what shims were used from the factory. The tolerances of the gearbox parts are very tight so you won't end up in a completely different range. The wide range of shims is there to compensate for the gearbox housing itself where you have to most tolerances. As long as it is the same the range will be very similar.

It all depends on how you're going to let them work on the tranny.
- order all the parts that you're think are defective
or
- open the gearbox first and order the parts needed

As you're in Canada you should be able to get the parts faster than I did in Europe. In advance you can order the parts you're going to change anyway and decide after opening the gearbox what needs to be replaced unexpectadly.

BTW the seals are not critical in the NSX gearbox except for the one at the input shaft bearing. A tube of Hondabond does the rest.

BTW no. 2: are you thinking about installing the short gears?
Click to expand...

As for short gears, no too expensive. The thing I'd really love is a Comptech 4.55 R&P. Why? I had an s2000 previously, sold it to get my NSX & I was just about to order the 4.56 or 4.77 for the S2000. It's something I had read a lot about & really wanted at the time.
 
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Not sure what you're asking but that is a transmission bearing within the case. That's a bearing that seldomly goes bad.

From this picture you need #17 , 19 and 21 if you want to change the ISB.
 

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