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Post by mercurymarc on Nov 21, 2023 3:17:13 GMT
Hello! I am wondering if anyone can help with my project car-1968 Austin America Auto Transmission that w sitting in junk yard for 20 years. Over the past year I cleared the tank, replaced the brakes and master cylinder, got the darn thing to idle and move up and down my driveway. When in neutral there is a whining/growling sound from the engine. The sound disappears when put in gear (R, 1, 2, 3, 4, and D) when car is stopped. The sound reappears when the car is in gear and moves. I have checked and replaced the oil/trans fluid. There is also a small fluid leak below the torque converter. I am getting ready to pull the engine/trans unit and rebuild the transmission- I have rebuilt several engines in the past but never a transmission. But before I do that, just hoping there might be a simpler solution. And curious if anyone can figure out what the sound is from (my guess is a bearing that spins in Neutral and also in gear, but not when in gear with the wheels stationary- but not sure which component that would be). Thanks in advance- any input appreciated. Thanks-
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Post by jockduck on Nov 21, 2023 10:28:14 GMT
Congrats on your purchase, I would suspect there are only a few for these left in the US. The AP box is not too difficult if you can do engines, you will need some special tools which turn up on Ebay and the like from time to time, I made mine, if you can handle a welder its fairly simple.
Your diagnosis of the grumble sounds fair, since you are dismantling the box and that is the correct thing to do, I imagine the car spent a lot of time doing nothing so seals, clutches, bands and bearings will have some damage. To change the oil and and cross your fingers will ultimately end in tears. Have you visited the "AustinAmerica" website you should fine some useful information there.
Jock
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Post by mercurymarc on Nov 22, 2023 3:42:34 GMT
Thanks Jock! Any idea where to get a rebuild kit? I have heard about JPAT in the UK but not sure if that is an appropriate source. -Marc |
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Post by jockduck on Nov 22, 2023 10:00:38 GMT
Hi, I am in Australia so things will be different, I bought my kits (20+ years ago) from local Mini specialist, there appeared to be two levels of kit an overhaul kit and a master overhaul kit, I did visit JPAT in Bristol in 2007 they seemed to be winding down a bit with AP spares you could still get clutch plates, bands relined and seals but not things like forward clutch housings, gearset thrust washers things I needed then. I have no idea what the spares situation is like in the US some of our American friends may want to add some information. I assume the UK is still the best source of spares, I have not needed to buy spares for a while.
Jock
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Post by notamini on Nov 22, 2023 13:18:52 GMT
Look up and PM Martin at MRA Minis on this forum. He is our parts and tools guru. Be advised he is sometimes hard to get hold of.
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Post by mercurymarc on Nov 27, 2023 0:42:31 GMT
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Post by notamini on Nov 27, 2023 2:05:53 GMT
Whatever you do, read carefully how to remove the torque converter. Otherwise you could get into a serious issue.
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Post by jockduck on Nov 27, 2023 10:00:10 GMT
Thats not a bad looking unit considering its spent 20 years sitting in a junkyard.
Jock
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Post by mercurymarc on Dec 5, 2023 7:47:23 GMT
Well I pulled the transmission and engine and removed the torque converter. The good news is that the converter looks good. But the idler gear shaft is not centered and I found a partially disintegrated metal sleeve at the bottom of the torque converter housing. The idler gear makes a terrible rattling sound when rotating so I'm looking forward to seeing what is behind the the next panel.   |
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Post by jockduck on Dec 5, 2023 10:32:56 GMT
Thats an impressive bit of damage, I have heard of idler bearing failure, I'm not sure if there was not an increase in bearing size in later cars, the manuals show an add on reservoir for the inner idler bearing (never come across one) my present running 'box has a badly worn inner thrust face, JPAT used to do a repair. I did a modification to improve the oil feed, I speculate that the inner thrust face is loaded when the engine is on load and oil can't get in to lubricate the thrust faces, I could not get thick enough thrust washers to correct the required clearance, the 'box "clacks" when lifting the throttle. Keep digging!
Jock
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Post by jockduck on Dec 6, 2023 7:39:26 GMT
Just had a thought that undoing the input shaft nut may be difficult, I usually lock the C/shaft sleeve gear, the nut usually a nylock is not too tight, I guess a rattle gun would do the job, I don't have one.
Jock
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Post by 6886auto on Dec 7, 2023 8:05:54 GMT
That's spectacular. At least you can say you have found the issue. Unfortunately it still really means a total rebuild.
I do think they made them larger later on.
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Post by 6886auto on Dec 7, 2023 8:09:38 GMT
Just had a thought that undoing the input shaft nut may be difficult, I usually lock the C/shaft sleeve gear, the nut usually a nylock is not too tight, I guess a rattle gun would do the job, I don't have one. Jock Interesting point. Making a sleeve to centralise the shaft in place of the bearing might be an option. I always use an impact wrench to remove them but there still needs to be some resistance. |
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