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Hi all.
I understand that engaging reverse with the overdrive on is a bad thing, but out of curiosity, why? What happens?
Cheers, Mark.
A big bang
The same thing affects both A and J type and there is NO escape ! If you're stuck in overdrive and you go into reverse then the clutch WILL be ruined and you will almost definitely have to replace the overdrive - and hope that the swarf and stuff hasn't got into the gearbox as well (as it shares the same oil).
I'm not sure as to how the overdrive would still be 'in' to even get it into reverse gear. Is that possible ?
Yes. The OD can only be selected in 3 & 4 because the inhibitor switch allows it. If that switch is faulty (always closed) or by-passed, then it can be selected in any gear, including reverse.
Dave
1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.
Yes. The OD can only be selected in 3 & 4 because the inhibitor switch allows it. If that switch is faulty (always closed) or by-passed, then it can be selected in any gear, including reverse.
So Dave, does that mean if I can't select OD in first or second then it won't happen in reverse either? (Not that I'm about to put it to the test!)
Sadly, I have done it! It was in a Mk1 2000 but I can't remember why - maybe I didn't have the inhibit switch. It was a long time ago, probably about 1980-ish.
It all went into gear OK but when trying to reverse there seemed to be something stopping the car moving. I applied more power upon which the car did move. A bit. This was an 'A' type and the uni-directional clutch 'carrier' (for want of a better decription) and cage fractured. In those days I had even less money than now so I removed, stripped and rebuilt the overdrive. All I replaced was the 'carrier', cage and a big circlip as I remember. Everything worked OK after that until I sold the car and then right up until it was scrapped due to tin worm.
As the carrier and cage just fractured, I don't think there was any swarf produced so I was lucky!
Cheers,
Mike.
Mine since 1987. Finished a 20+ year rebuild in 2012. One of many Triumphs and a 1949 LandRover!
So Dave, does that mean if I can't select OD in first or second then it won't happen in reverse either? (Not that I'm about to put it to the test!)
Cheers, Mark.
I can't see how it would. The OD needs 12v to activate the solenoid. 12v is only available to the gear-lever switch if the inhibitor switch on the box is closed, and this can only happen in 3 & 4 as it is operated by the selector rods inside the box. Unless the switch is broke or by-passed, and as you can't select OD in 1 or 2 it seems to be working OK.
Dave
1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.
Sadly, I have done it! It was in a Mk1 2000 but I can't remember why - maybe I didn't have the inhibit switch. It was a long time ago, probably about 1980-ish.
It all went into gear OK but when trying to reverse there seemed to be something stopping the car moving. I applied more power upon which the car did move. A bit. This was an 'A' type and the uni-directional clutch 'carrier' (for want of a better decription) and cage fractured. In those days I had even less money than now so I removed, stripped and rebuilt the overdrive. All I replaced was the 'carrier', cage and a big circlip as I remember. Everything worked OK after that until I sold the car and then right up until it was scrapped due to tin worm.
As the carrier and cage just fractured, I don't think there was any swarf produced so I was lucky!
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