Crunching going to reverse
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 1,136
Likes: 8
From: Chichester, UK
Crunching going to reverse
Hey Guys
Need a little help, pls.
Gearbox is making really bad crunching noise when selecting reverse.
This only happens after the car is fully warmed up and only when selecting reverse.
No issues with forward gears, or when cold.
While selecting the reverse you can feel the resistance from the gearbox.
Just really confused why this only happens when hot and only reverse.
Thank you
Need a little help, pls.
Gearbox is making really bad crunching noise when selecting reverse.
This only happens after the car is fully warmed up and only when selecting reverse.
No issues with forward gears, or when cold.
While selecting the reverse you can feel the resistance from the gearbox.
Just really confused why this only happens when hot and only reverse.
Thank you
Last edited by C3Paul; Apr 19, 2019 at 03:04 PM.
Team Owner
Joined: Apr 1999
Posts: 21,953
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I have not rebuilt a tko 600 to verify it, but many trannies don't use synchros on the reverse gear to help the gear mesh
So the main shaft is spinning and the reverse gear is stationary
So the main shaft is spinning and the reverse gear is stationary
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 1,136
Likes: 8
From: Chichester, UK
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 1,136
Likes: 8
From: Chichester, UK
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If first then reverse isnt working and it doesnt do it when the oil is thick and cold I would try adjusting the clutch and checking the fluid level. I would also check to see what condition teh oil is in while you hae the plug out. If it hasnt been changed since it was new then it could be time for a change.
Last edited by Rescue Rogers; Apr 19, 2019 at 09:41 PM.
Burning Brakes
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From: LaFayette Georgia
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You need 1" of pedal free movement under finger pressure before the linkage slack is gone. You can check that first. Put transmission into a forward synchronized gear before trying to go into reverse will stop all the gears from rotating if everything is right with the setup.
If it is too much slack in the clutch linkage from bad adjustment, the clutch will not release fully. The disk (and gears) will continue to rotate with the flywheel and the reverse gears are trying to mesh while only one of them is rotating so you get the grind.
If the slack is too tight the clutch may slip under load and that causes lots of heat which cooks the clutch. Warpage from heat will cause the disk to not release fully with the same result as above. The clutch will need to be replaced not due to wear but due to warpage. Can not adjust it away.
If it is too much slack in the clutch linkage from bad adjustment, the clutch will not release fully. The disk (and gears) will continue to rotate with the flywheel and the reverse gears are trying to mesh while only one of them is rotating so you get the grind.
If the slack is too tight the clutch may slip under load and that causes lots of heat which cooks the clutch. Warpage from heat will cause the disk to not release fully with the same result as above. The clutch will need to be replaced not due to wear but due to warpage. Can not adjust it away.