Cruching changing gears

Azza SP20 · 27-01-2006, 03:20 PM

Hi All

i Seem to have developed a crunching sound when changing friom 1st to 2nd, and it doesnt happen all the time, so i cant pinpoint the exact cause.

The car has only done 74k.

Any suggestions??

Laser the Amazer · 27-01-2006, 06:34 PM

is this only when it cold or when hot as well

is it still changing gear smoothly?

has the gearbox oil been changed ?

Rob

mike_d87 · 27-01-2006, 07:45 PM

mine does this too. it started out when i would shift after redlining first but now it does it at completely random times. my theory is that my synchro's r rooted. but mine has done nearly 140k, so it may not apply to ur situation

ezin · 28-01-2006, 07:57 PM

Gearbox oil change is at 80k, has this been done yet?

If not change the oil and give that a shot.

If oil has been changed then the synco sleave is sliding over the sycro ring and hiting 2nd gear cluster (crunching) Its pretty standard for this to happen in a manual gearbox as the design itself is flawed because of this exact reason. All u can do is keep driving and not race change so much, remember the gearboxs in standard cars are not designed for race changes even though u can get away with it 90% of the time. If its crunching every time u will need a new syncro ring and possibly a new 2nd gear cluster.

Azza SP20 · 29-01-2006, 03:00 PM

My gearbox oil hasnt been changed as it hasnt had the 80k done yet. Hopefully that should help it

If i was to change the oil myself. is it an expensive job??

MitchEG · 29-01-2006, 06:24 PM

your clutch linkage may just be in need of an adjustment. If the clutch engages very close to the floor it may not be releasing fully making the changes a bit crunchy. U adjust the pickup point in the footwell, worth trying cos 75k seems early for synchros to go. see this thread for details http://www.astinagt.com/forums/showthread.php?t=5671

Cosmo Dude · 29-01-2006, 06:31 PM

Quote:

Originally Posted by Azza SP20

My gearbox oil hasnt been changed as it hasnt had the 80k done yet. Hopefully that should help it

If i was to change the oil myself. is it an expensive job??

If you do the job your self then it's the cost of the oil. Not too difficult if you are handy with a spanner.
If you have to ask how to do it then get it done at our next service. Don't rush the gears until you have the new fluid.

luckythedonkey · 31-01-2006, 10:48 AM

If it's under warranty, take it to Mazda.

Mine was crunching from 2nd to 3rd. I got some 3rd party mechanics to have a look and they said it was the synchros. I called mazda and they stripped/rebuilt the box all under warranty. Problem is fixed and gear changes are smooth as.

I got an extra year warranty thrown in when I bought my car so I was lucky.

chicaboo · 31-01-2006, 10:57 AM

First words from Mazda when I asked them to look at my gearbox/cutch about crunching was: "the clutch is a serviceable item..." FAR QUEUE MAZDA!

blacksp20 · 31-01-2006, 02:28 PM

I have to think that it is the synchro's as I have 72K's and just had the gearbox oil changed last service (without my knowledge, thanks ultratune!) and it still does it occasionally when I race into second.

sounds a bit like gear crunch, but much slower sound, if that makes sense and not as loud. definately can feel it through the stick though.

Laser the Amazer · 31-01-2006, 06:56 PM

Quote:

Originally Posted by chicaboo

First words from Mazda when I asked them to look at my gearbox/cutch about crunching was: "the clutch is a serviceable item..." FAR QUEUE MAZDA!

spot on

unless they can prove its a manfacturing defect the clutch isn't covered

Rob

andrewgrazier · 31-01-2006, 11:02 PM

push the clutch all the way in :P !?

chicaboo · 31-01-2006, 11:07 PM

Push the clutch all the way in? Yeah, I'd like to push it all the way in their arse...

MitchEG · 31-01-2006, 11:19 PM

Quote:

Yeah, I'd like to push it all the way in their arse...

dude, thats not really appropriate here on AstinaGT.com "family" forum...haha

chicaboo · 31-01-2006, 11:23 PM

Sorry Red member.

MitchEG · 31-01-2006, 11:24 PM

you bet, we need all the red members we can get

27-01-2006, 03:20 PM	#1
Azza SP20 Junior Member Join Date: Nov 2005 Posts: 26 View Photos By: Azza SP20	Cruching changing gears Hi All i Seem to have developed a crunching sound when changing friom 1st to 2nd, and it doesnt happen all the time, so i cant pinpoint the exact cause. The car has only done 74k. Any suggestions??

27-01-2006, 06:34 PM	#2
Laser the Amazer Senior Member Join Date: Dec 2002 Location: Wollongong Posts: 559	is this only when it cold or when hot as well is it still changing gear smoothly? has the gearbox oil been changed ? Rob __________________ what do u write here again???

31-01-2006, 02:28 PM	#10
blacksp20 Junior Member Join Date: Aug 2004 Location: Newcastle, Australia Car: '02 SP20 Astina Posts: 42	I have to think that it is the synchro's as I have 72K's and just had the gearbox oil changed last service (without my knowledge, thanks ultratune!) and it still does it occasionally when I race into second. sounds a bit like gear crunch, but much slower sound, if that makes sense and not as loud. definately can feel it through the stick though. __________________ Everything is what it is, so that it cannot become what it is not. - Parmenides.

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27-01-2006, 07:45 PM	#3
mike_d87 AstinaGT Regular Join Date: Mar 2005 Location: Newcastle Car: Astina Posts: 481 View Photos By: mike_d87	mine does this too. it started out when i would shift after redlining first but now it does it at completely random times. my theory is that my synchro's r rooted. but mine has done nearly 140k, so it may not apply to ur situation

28-01-2006, 07:57 PM	#4
ezin AstinaGT Regular Join Date: Jul 2003 Location: melb Posts: 416 View Photos By: ezin	Gearbox oil change is at 80k, has this been done yet? If not change the oil and give that a shot. If oil has been changed then the synco sleave is sliding over the sycro ring and hiting 2nd gear cluster (crunching) Its pretty standard for this to happen in a manual gearbox as the design itself is flawed because of this exact reason. All u can do is keep driving and not race change so much, remember the gearboxs in standard cars are not designed for race changes even though u can get away with it 90% of the time. If its crunching every time u will need a new syncro ring and possibly a new 2nd gear cluster.

29-01-2006, 03:00 PM	#5
Azza SP20 Junior Member Join Date: Nov 2005 Posts: 26 View Photos By: Azza SP20	My gearbox oil hasnt been changed as it hasnt had the 80k done yet. Hopefully that should help it If i was to change the oil myself. is it an expensive job??

29-01-2006, 06:24 PM	#6
MitchEG AstinaGT Regular Join Date: Mar 2005 Location: Brisbane, South Car: Cibicu Posts: 324	your clutch linkage may just be in need of an adjustment. If the clutch engages very close to the floor it may not be releasing fully making the changes a bit crunchy. U adjust the pickup point in the footwell, worth trying cos 75k seems early for synchros to go. see this thread for details http://www.astinagt.com/forums/showthread.php?t=5671

31-01-2006, 10:48 AM	#8
luckythedonkey Junior Member Join Date: Jan 2006 Posts: 16	If it's under warranty, take it to Mazda. Mine was crunching from 2nd to 3rd. I got some 3rd party mechanics to have a look and they said it was the synchros. I called mazda and they stripped/rebuilt the box all under warranty. Problem is fixed and gear changes are smooth as. I got an extra year warranty thrown in when I bought my car so I was lucky.

31-01-2006, 10:57 AM	#9
chicaboo Senior Member Join Date: Sep 2004 Location: Logan prefecture Car: Touge monster Posts: 7,585	First words from Mazda when I asked them to look at my gearbox/cutch about crunching was: "the clutch is a serviceable item..." FAR QUEUE MAZDA!

31-01-2006, 11:02 PM	#12
andrewgrazier Senior Member Join Date: Feb 2003 Location: newcastle Posts: 586 View Photos By: andrewgrazier	push the clutch all the way in :P !?

31-01-2006, 11:07 PM	#13
chicaboo Senior Member Join Date: Sep 2004 Location: Logan prefecture Car: Touge monster Posts: 7,585	Push the clutch all the way in? Yeah, I'd like to push it all the way in their arse...

31-01-2006, 11:23 PM	#15
chicaboo Senior Member Join Date: Sep 2004 Location: Logan prefecture Car: Touge monster Posts: 7,585	Sorry Red member.

31-01-2006, 11:24 PM	#16
MitchEG AstinaGT Regular Join Date: Mar 2005 Location: Brisbane, South Car: Cibicu Posts: 324	you bet, we need all the red members we can get