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J_A_M
 Post subject: Cold gear crunching
PostPosted: Fri Dec 09, 2005 9:11 pm 
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Why is it that some gearboxes crunch that very first gear change from 1st to second (when cold only) ?
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69 red dwarf
 Post subject:
PostPosted: Fri Dec 09, 2005 9:19 pm 
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Location: Kings Park. not quite hills. sydney
use the clutch :lol:
sorry

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mickmini
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PostPosted: Fri Dec 09, 2005 9:25 pm 
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Location: Sydney - strangely, I am glad of the sight of hills!!
old ones or new ones?

i think it has something to do with the torque ratio in the lower gears creating larger forces on the synchros than the higher ratio changes. that seems to wear out the 2nd gear synchors and selectors more than other gears

its a theory :roll:

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drmini in aust
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PostPosted: Fri Dec 09, 2005 9:39 pm 
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Location: near Baulkham Hills, NSW
Oil is thicker when cold, lubricates baulk rings a bit too well sometimes- then they don't grip the taper on the gear.
Not helped in your case by that tight? idler gear... :cry:

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Betty
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PostPosted: Fri Dec 09, 2005 9:54 pm 
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i don;'t know why the crunch
mine does it from third to fourth gear....
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KennyKix
 Post subject:
PostPosted: Fri Dec 09, 2005 10:10 pm 
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Location: Canberra ACT
mine got "fixed" when i put a new slave in and adjusted the clutch? :shock:

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drmini in aust
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PostPosted: Sat Dec 10, 2005 5:54 am 
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Location: near Baulkham Hills, NSW
Betty wrote:
i don;'t know why the crunch
mine does it from third to fourth gear....

This can be a sign the nose bearing on the mainshaft has had it, the 4th gear synchro ring then gets worn out from supporting the shaft.
Baracade knows all about this.... :cry:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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meeni
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PostPosted: Sat Dec 10, 2005 7:05 am 
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it doesnt do it anymore if you extend the pin on the clutch arm, my mate is making adjustable ones because heaps of people have this problem.

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drmini in aust
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PostPosted: Sat Dec 10, 2005 7:45 am 
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meeni wrote:
it doesnt do it anymore if you extend the pin on the clutch arm, my mate is making adjustable ones because heaps of people have this problem.

That's usually a sign that the clutch arm, or the bottom plunger, or pivot pin is worn out. :wink:
I just take the circlip out of the slave cylinder to achieve the same result.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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