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General Information => Troubleshooting => Topic started by: LoneWolf on August 03, 2010, 05:03:33 pm

Title: gearbox noisy at idle until clutch pressed in
Post by: LoneWolf on August 03, 2010, 05:03:33 pm

Today i decided to replace my clutch release bearing on the mk2, straight forward enough, changed out the old gear oil and fired her up....... and the horrible knackered bearing sound was still there :-\

 ive looked at a few drawings/ diagrams of the gearbox and cant for the life of me work out whats making this rather annoying noise :(

 Any ideas guys and gals?

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: theman53 on August 03, 2010, 05:19:34 pm

could it be the springs are getting loose in the clutch disc? When I took my old disc out I couldn't believe how close it was to coming undone. Other than that I don't know. Maybe contact brokevw.com

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: rs899 on August 03, 2010, 06:13:04 pm

Yeah, I pulled a good looking clutch out of my car that was about to come apart, too.  It could be the small thrust plate deal that rides in the pressure plate has become loose. Hate to say this but you may want to take it apart for some peace of mind....

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: Quantum TD on August 03, 2010, 10:06:11 pm

Quote from: theman53 on August 03, 2010, 05:19:34 pm

could it be the springs are getting loose in the clutch disc? When I took my old disc out I couldn't believe how close it was to coming undone. Other than that I don't know. Maybe contact brokevw.com

X2

Sounds like a broken spring.

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: 81 vw pu on August 03, 2010, 11:25:38 pm

Quote

changed out the old gear oil and fired her up....... and the horrible knackered bearing sound was still there

Was there any metal flakes in the old oil you drained? Could also be the input shaft bearings. When you pull it out to check the clutch disc springs, spin the imput shaft with a large drill while in neutral to know for sure if its clutch or trans-axle.

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: LoneWolf on August 03, 2010, 11:43:02 pm

I didnt see any metal in the old oil, but theres a magnet inside to catch the bits, so there may be some there somewhere.

 i just knew itd be a gearbox off job, i hate doing that  :(

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: rs899 on August 04, 2010, 04:49:03 am

What does it sound like?  Does it change with clutch in or out?

I have never heard of a throwout bearing going bad on one of these as they are bathed in oil...but anything is possible...

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: 81 vw pu on August 04, 2010, 07:00:46 am

Quote

Does it change with clutch in or out?


Read the topic line one more time.

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: rs899 on August 04, 2010, 07:48:24 am

Duh-  ooops.  As I wrote that I kept thinking I knew the answer already, but I couldn't find it in the body of the string....sorry.

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: LoneWolf on August 04, 2010, 04:33:18 pm

just a thought, but if the push-rod in the middle of the input shaft was worn, could that be a possible suspect?

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: rs899 on August 04, 2010, 07:59:57 pm

I don't think so....something is shaking in the bellhousing.

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: Rabbit on Roids on August 05, 2010, 10:07:34 am

my bet would be that its time to replace some bearings..

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: LoneWolf on August 05, 2010, 04:34:05 pm

if its going to involve stripping the gearbox and rebuilding it then i think ill start looking for another box, i REALLY dont want to be taking the thing to bits at the side of the road again  :(

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: Rabbit on Roids on August 06, 2010, 02:00:59 pm

its bolted down tight to the engine right?

if it is, then i would suspect clustergear bearings..

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: LoneWolf on August 06, 2010, 04:26:10 pm

Are these easy to get at?

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: theman53 on August 06, 2010, 04:35:03 pm

http://www.brokevw.com/ (http://www.brokevw.com/)

Everything you did or didn't want to know about the VW 020 trans

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: Rabbit on Roids on August 07, 2010, 11:11:08 am

Quote from: LoneWolf on August 06, 2010, 04:26:10 pm

Are these easy to get at?

what? easy to get at what?

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: LoneWolf on August 07, 2010, 01:28:14 pm

at the bearings you suggested

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: Rabbit on Roids on August 07, 2010, 04:26:44 pm

you have to tear the trans apart into a million pieces afaik..

Title: Re: gearbox noisy at idle until clutch pressed in
Post by: rs899 on August 08, 2010, 03:23:34 am

Either way, there's no magic bullet for this.  Pull it, look for clutch/prssure plate issues.  If nothing jumps out at you there, buy another gearbox.   You might be able to figure it out using a stethoscope applied to both areas of the gearbox.  A rattle would suggest clutch, a rumble would suggest gearbox.