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alg
Samba Member
Joined: April 24, 2006
Posts: 134
Location: Webberville, TX
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 Posted: Sat Oct 28, 2006 2:13 pm Post subject: transmission noise in 4th |
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Just started today.
Happens in 4th gear after warm-up.
The sound is similar to that of a noisy throw-out bearing and is noticable with the top off. (yow)
Clearly the issue occurs when the shifter is in 4th - clutch in or out if the car was rolling. Any other gear or neutral and it was quiet.
Its the original trans. Had the fluid changed religiously, including by myself only 6 mos ago. No leaks.
Runs smooth and strong regardless of the sound.
Concerned that driving it would be a bad idea until I resolve this, and I just looovvveee driving that Thing. |
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xeno
Samba Member
Joined: July 26, 2006
Posts: 653
Location: Mile High
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| Posted: Sun Oct 29, 2006 5:41 am Post subject: |
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| Have you inspected your shift bushing in the trap door? |
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alg
Samba Member
Joined: April 24, 2006
Posts: 134
Location: Webberville, TX
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| Posted: Sun Oct 29, 2006 7:53 pm Post subject: |
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| Have you inspected your shift bushing in the trap door? |
that bushing can make a noise?
I assumed the bushing would affect shifting, and for a 33 yr old car, it shifts like buttah.
given the age would it just be best to replace the bushing, regardless?
thanks for the tip,
alg |
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xeno
Samba Member
Joined: July 26, 2006
Posts: 653
Location: Mile High
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| Posted: Sun Oct 29, 2006 8:15 pm Post subject: |
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| alg wrote: |
| that bushing can make a noise? |
No, but it could allow the tranny not to go all the way in to gear or with engine roll cause the same thing. Start cheap. If that is not it, then it probably the tranny (bearing or gear). Though it will probably last a long time.
Have you verified that oil is in the case and of the proper weight? |
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Ferretkona
Samba Member
Joined: December 03, 2005
Posts: 1306
Location: Columbia, CA
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| Posted: Mon Oct 30, 2006 1:58 am Post subject: |
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| It is amazing. When it comes to cars the simplest answer is often the answer. Most often on VW's. |
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Bruce
Samba Member
Joined: May 16, 2003
Posts: 17285
Location: Left coast, Canada
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| Posted: Mon Oct 30, 2006 2:10 am Post subject: |
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It is not the shift bushing, or the shifter coupler. Your mainshaft ball bearing is bad. This is the bearing on the top shaft at the front of the trans, immediately adjacent to 4th gear. Since it is above the waterline, it commonly goes bad.
Check the oil level. When you last changed it did you use cheap oil? I have had noisy MS ball bearings get quiet again with a gear oil change. |
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Ferretkona
Samba Member
Joined: December 03, 2005
Posts: 1306
Location: Columbia, CA
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| Posted: Mon Oct 30, 2006 2:47 am Post subject: |
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| Bruce wrote: |
| Check the oil level. When you last changed it did you use cheap oil? I have had noisy MS ball bearings get quiet again with a gear oil change. |
WTF, It is so common to see people pay $50 for a tank of fuel. But unwilling to pay a few dollars for a oil change! |
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honky
Samba Member
Joined: August 10, 2006
Posts: 149
Location: Connecticut, USA
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| Posted: Mon Oct 30, 2006 8:07 am Post subject: gear oil |
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| If you are going to try an oil change to fix it your best bet is to put in a synthetic like Red Line MT90 |
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Pogel
Samba Member
Joined: November 21, 2005
Posts: 38
Location: Florida
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| Posted: Mon Oct 30, 2006 10:36 am Post subject: Transmission noise in 4th |
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| I have a new engine and new trans. Everything was running fine, but I took it in for the valves to be checked and adjusted. The next day I developed a noise only in 4th gear. I am taking it back to see if they didn't do the job properly. Did you have a valve job recently? I will let you know how I progress. |
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alg
Samba Member
Joined: April 24, 2006
Posts: 134
Location: Webberville, TX
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| Posted: Mon Oct 30, 2006 11:36 am Post subject: |
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| Bruce wrote: |
It is not the shift bushing, or the shifter coupler. Your mainshaft ball bearing is bad. This is the bearing on the top shaft at the front of the trans, immediately adjacent to 4th gear. Since it is above the waterline, it commonly goes bad.
Check the oil level. When you last changed it did you use cheap oil? I have had noisy MS ball bearings get quiet again with a gear oil change. |
I used Valvolene 80W90 synthectic blend. it was filled on a very level floor and not over/underfilled at all.
Should I just get a new transmission then? |
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Bruce
Samba Member
Joined: May 16, 2003
Posts: 17285
Location: Left coast, Canada
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| Posted: Mon Oct 30, 2006 1:41 pm Post subject: |
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| alg wrote: |
| Bruce wrote: |
It is not the shift bushing, or the shifter coupler. Your mainshaft ball bearing is bad. This is the bearing on the top shaft at the front of the trans, immediately adjacent to 4th gear. Since it is above the waterline, it commonly goes bad.
Check the oil level. When you last changed it did you use cheap oil? I have had noisy MS ball bearings get quiet again with a gear oil change. |
I used Valvolene 80W90 synthectic blend. it was filled on a very level floor and not over/underfilled at all.
Should I just get a new transmission then? |
Does it also make a lesser amount of the same type of noise in 3rd gear?
Did this noise just appear suddenly, or gradually?
Check the oil level, you may have developed a leak, leaving the bearing under lubed.
Before you dive into a rebuild, I'd continue to drive it to see if it gets worse. |
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Bruce
Samba Member
Joined: May 16, 2003
Posts: 17285
Location: Left coast, Canada
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| Posted: Mon Oct 30, 2006 1:42 pm Post subject: |
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| Pogel wrote: |
| .... I took it in for the valves to be checked and adjusted. The next day I developed a noise only in 4th gear. I am taking it back to see if they didn't do the job properly..... |
There is no connection whatsoever between the engine's valves and a noisy 4th gear. Save yourself the embarasment and don't suggest they "caused" the noise to appear. Just ask them to look into the noisy gear. |
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xeno
Samba Member
Joined: July 26, 2006
Posts: 653
Location: Mile High
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| Posted: Mon Oct 30, 2006 7:27 pm Post subject: |
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| I'd replace the shift bushing & the cage (that it usually comes with) and then check the oil. Could be that you think it is theforth gear, however it is caused by the half shaft when your "cruzing" in forth causing the back lash. You can jack it up and check those. If not, drive it till it fails (which I would think would be a long time). |
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alg
Samba Member
Joined: April 24, 2006
Posts: 134
Location: Webberville, TX
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| Posted: Tue Oct 31, 2006 7:56 am Post subject: |
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Does it also make a lesser amount of the same type of noise in 3rd gear?
Did this noise just appear suddenly, or gradually?
Check the oil level, you may have developed a leak, leaving the bearing under lubed. |
No noise in any other gear except 4th.
The oil level was perfect. FYI: I learned long ago that you have to fill the transmission carefully - cannot over/underfill at all.
Noise appeared suddenly and seems consistent now, though you have to run the car a few mins before the noise starts.
thanks to all for your comments and assistance,
alg |
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Bruce
Samba Member
Joined: May 16, 2003
Posts: 17285
Location: Left coast, Canada
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| Posted: Wed Nov 01, 2006 4:24 am Post subject: |
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| alg wrote: |
| Quote: |
Does it also make a lesser amount of the same type of noise in 3rd gear?
Did this noise just appear suddenly, or gradually?
Check the oil level, you may have developed a leak, leaving the bearing under lubed. |
No noise in any other gear except 4th.
Noise appeared suddenly and seems consistent now, though you have to run the car a few mins before the noise starts.
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A bad MS bearing would make noise in 4th gear all the time. If it was really bad, you'd hear it in 3rd too. The noise would gradually build, not suddenly start. |
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