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| Auto Gearbox Question https://www.ausmini.com/forums/viewtopic.php?f=2&t=64317 |
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| Author: | jubblies [ Sun Jul 11, 2010 9:26 pm ] |
| Post subject: | Auto Gearbox Question |
I've been playing around with an engine that has an auto gearbox. I picked the engine up from the previous owner saying they did not know what condition it was in. I'm testing the drivetrain on the engine so I leave the box in Neutral and turn the engine over and the uni joints don't turn - cool. I put the box in any other gear, turn the engine over and the unit joints move around, but I apply pressure to them and I can hold them and they don't move. I'm guessing it should move as if it was driving. Any ideas what could be wrong? other info: It's a Morris Mini Matic engine (not Rover) and I am using a battery to turn the engine over. |
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| Author: | Pottsy [ Sun Jul 11, 2010 9:43 pm ] |
| Post subject: | |
At cranking speed, surely an auto will allow the driveshafts to be stopped, else how else would you sit at lights with the engine idling? The torque converter won't approach stall speed (when it's starting to transfer all the power to the gears) until the motor is at a speed above idle. (Unless of course the AP auto is way different from other types?) The only real way to test the box would seem to me to be with the motor running up to normal driving revs. We have now exhausted my knowledge of auto boxes! Cheers, Pottsy |
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| Author: | drmini in aust [ Sun Jul 11, 2010 9:51 pm ] |
| Post subject: | |
Pottsy is correct ^^^, an AP box works like most other autoboxes in this respect. |
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| Author: | jubblies [ Sun Jul 11, 2010 10:04 pm ] |
| Post subject: | |
Thankyou Pottsy & drmini - that makes sense. So, at idle there should be no drive but at 2,000RPM (or there abouts) it should be doing something. I shal reassemble the carbs/exhaust and fire the beast up. |
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| Author: | drmini in aust [ Sun Jul 11, 2010 10:10 pm ] |
| Post subject: | |
Idle speed from memory (when my Matic was one) is 650 rpm. |
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| Author: | Morris 1100 [ Mon Jul 12, 2010 6:59 pm ] |
| Post subject: | |
The weak point in the auto box is the forward clutch. If the motor is out I would replace it or at least inspect it before going to the effort of fitting it to a car. Another good idea is to check the oil pressure at the gearbox with a gauge following the procedure in the manual. If the pressures are low in certain tests it can show a fault. They are a real easy box to work on. Parts are still available in the UK. |
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| Author: | jubblies [ Mon Jul 12, 2010 7:44 pm ] |
| Post subject: | |
Thanks for your answers Morris1100. I have 4 complete auto engines (of varying sizes) out of cars that I was wanting to test to see what they need. Your input is cool - thanks. Morris 1100 wrote: They are a real easy box to work on. I sure hope so!  Morris 1100 wrote: Parts are still available in the UK. Any ideas where from - any links available?
Thanks |
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| Author: | drmini in aust [ Mon Jul 12, 2010 7:47 pm ] |
| Post subject: | |
http://www.jpat.co.uk/ Enjoy... 
I bought gaskets and the forward clutch plates for the AP auto in Parramatta (Sydney) from http://www.pnc.com.au/~mmworld/ Not sure what other parts he carries, maybe worth a call. But that jpat link would be best if you need a whole bunch of stuff. |
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| Author: | niceboy1275 [ Mon Jul 12, 2010 8:13 pm ] |
| Post subject: | |
I used Jpat for my auto box stuff, they are real cheap (considering) and very quick. Got heaps of stuff. Highly recommended. |
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