Crunching
06 July 2005, 03:23 PM
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Crunching
A bit of a weird one. I get a crunching (sensation no noise though) when executing fast gear changes from 3rd to 4th at 6k upwards. If I change gear slowley (still @ high rpm) no crunch.
Doesn't happen in any other gear. Any ideas?
Thanks
AC
Doesn't happen in any other gear. Any ideas?
Thanks
AC
Last edited by AC-scoobie; 06 July 2005 at 03:30 PM.
07 July 2005, 01:36 PM
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The synchromesh will synchronise the cog speeds to allow for an easier gearchange. A bit like revoling door in a hotel you walk quicker if the door is spinning quicker & slow down if it is going slowly. And you get through without "crunching" yourself
Which in principle is the same for changing gears.....
Which in principle is the same for changing gears.....
07 July 2005, 07:19 PM
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Originally Posted by Gidney&Knowlesy
The synchromesh will synchronise the cog speeds to allow for an easier gearchange. A bit like revoling door in a hotel you walk quicker if the door is spinning quicker & slow down if it is going slowly. And you get through without "crunching" yourself
Which in principle is the same for changing gears.....
Which in principle is the same for changing gears.....
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07 July 2005, 09:04 PM
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Originally Posted by tath
as long as you don't consider taking the box out and replacing the synchro rings major... sorry!
07 July 2005, 09:45 PM
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never taken a scooby box out but id imagine 30quid per hour min for someone who knows what they're doing - thats gonna be upwards of 150 just to take the box out and refit. then synchros are what? £15-£100 each? i have no idea tbh for a scoob 
plus a few hours to fit... it's gonna be £350 at the minimum id imagine. thought of a new (well secondhand) box?
edit: have any of you tried changing your box oil?
plus a few hours to fit... it's gonna be £350 at the minimum id imagine. thought of a new (well secondhand) box?
edit: have any of you tried changing your box oil?
Last edited by tath; 07 July 2005 at 09:47 PM. Reason: i'm a miserable ******* who should try and be more positive
07 July 2005, 09:54 PM
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Originally Posted by tath
never taken a scooby box out but id imagine 30quid per hour min for someone who knows what they're doing - thats gonna be upwards of 150 just to take the box out and refit. then synchros are what? £15-£100 each? i have no idea tbh for a scoob
plus a few hours to fit... it's gonna be £350 at the minimum id imagine. thought of a new (well secondhand) box?
edit: have any of you tried changing your box oil?
plus a few hours to fit... it's gonna be £350 at the minimum id imagine. thought of a new (well secondhand) box?
edit: have any of you tried changing your box oil?
07 July 2005, 10:22 PM
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Originally Posted by flat4_ire
got her fully serviced when she came in last month all oils changed..runnin fine, just sometimes as i said when flying from 3rd to 4th it crunches a lil bit, its out in the mechanics having the downpipe fitted so il say it to him tmrw to see what the story is..
mine baulks if i go 1st to 2nd too quickly sometimes but i'm not too worried at the mo...
12 September 2005, 10:21 AM
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This problem has been fixed. No gearbox or synchro required. Changed the gearbox oil from Silkoline to Castrol and it went away.
There are quite a few threads on this so I guess it can be quite common.
There are quite a few threads on this so I guess it can be quite common.
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