Re: R9 Overdrive Acting Up
Posted by HH56 On 2012/7/16 15:18:53
If all is good electrically and I kind of question that with the light being erratic (unless things are happening so fast the light never has a chance to go on), then here is some mechanical info.
The engagement is controlled by the balk ring. It is possible that some wear or perhaps the weight of oil has allowed the friction characteristics to change so maybe it is not moving as it should.
Basically, when car is moving but not actually in OD, all components in OD are at the same speed and balk ring is "parked" blocking the pawl engagement. You can see in the first illustration from R9 manual. When disengaged but the solenoid is ready, the pawl is resting against the ring. When engaged, the ring has shifted a few degrees aligning the slot with pawl so it can move in.
It's controlled by the speed differential inside OD. Was going to try and explain but remembered this description from R11 manual so it tells operation much better. B-W calls it a blocker but the function & operation is the same on both R9 and R11.
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The engagement is controlled by the balk ring. It is possible that some wear or perhaps the weight of oil has allowed the friction characteristics to change so maybe it is not moving as it should.
Basically, when car is moving but not actually in OD, all components in OD are at the same speed and balk ring is "parked" blocking the pawl engagement. You can see in the first illustration from R9 manual. When disengaged but the solenoid is ready, the pawl is resting against the ring. When engaged, the ring has shifted a few degrees aligning the slot with pawl so it can move in.
It's controlled by the speed differential inside OD. Was going to try and explain but remembered this description from R11 manual so it tells operation much better. B-W calls it a blocker but the function & operation is the same on both R9 and R11.
Attach file:
(54.96 KB)
(94.39 KB)
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