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01-11-2011, 02:11 PM | #1 |
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Location: Kalamazoo, MI
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pretesting a transmission
Could a transmission be mounted to a fixture and bench tested with a drill motor and if so, would this 'no load' test be of enough value to uncover any potential issues before installing in a car? Just thinking out loud.
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01-11-2011, 02:51 PM | #2 |
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Re: pretesting a transmission
The A Tramission is so simple,just pop the shift tower off and inspect the forks and shifter ball first. Then inspect the gears for broken or chiped teeth.
A rig to test spin the trans? The noise the drill motor would make would hide any noise the trans made. |
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01-11-2011, 02:57 PM | #3 |
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Re: pretesting a transmission
Dan,
I don't see any value, IF all the parts are reasonable good. I have welded gears and " hand fitted " them, even a ring gear on a flywheel, for my low buck pals. The shift tower is more problematic, I think, forks, shafts, stick, balls and springs Dudley |
01-11-2011, 04:47 PM | #4 |
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Re: pretesting a transmission
What you don't want to do is mount it in the car and before installing the rear end run the engine and try to test it out. Without the U-joint installed it will dump oil all over the place. And if you install the U-joint it will flail all over the place. What we did was take a U-joint apart and install only the front end piece for the test. The U-joint is what holds the bearing snug against the bearing stop.
Tom Endy |
01-11-2011, 05:32 PM | #5 |
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Re: pretesting a transmission
Dan/Kzo
I have done exactly what you describe a few times. I made an adapter to fit the stub of the input shaft that had a set screw in it to clamp down on it. I borrowed the tool to a friend and I do not recall getting it back. I'll check my work area and post a picture of it if I have it. I also made a second version of the tool that used a "nut" as the adapter with three set screws. It's a bit crude but it works....see attached pic's. When I first did the testing, I checked 4 transmissions we had in our stock pile so the learning of the correct sound was a matter of trial and remembering what conditions caused a particular noise. We also had a newly rebuilt transmission to use as a base also. The test will tell you if used bearings have excessive play and with a little back-loading by grabbing the u-joint you can tell if the gears will howl also. I use a cordless driver/drill with a torque clutch set rather low for safety. Set your transmission on a pad of carpet to isolate the sound and go to it. Realize that you may be introducing a slight misalignment to the input shaft if you don't hold the drill correctly and it will make a sound...you'll know what I am describing if you try it. We have run the tests dry and with oil. Both methods will point out a problem if one exists. My only concern is that you will not have the benefit of listening to multiple transmissions for a base to judge. Good Day! Dave in MN Last edited by Dave in MN; 01-13-2011 at 04:53 PM. Reason: Add photos |
01-11-2011, 09:17 PM | #6 |
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Re: pretesting a transmission
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Tom Endy |
01-12-2011, 08:46 AM | #7 | |
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Re: pretesting a transmission
Quote:
Good Day, Dave in MN Last edited by Dave in MN; 01-13-2011 at 12:33 PM. |
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01-12-2011, 10:08 AM | #8 |
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Re: pretesting a transmission
thanks everyone for the input. I have a couple used and a rebuilt transmission and may experiment.
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01-12-2011, 12:28 PM | #9 |
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Re: pretesting a transmission
I made a adapter out of a clutch plate. Married it to a v-belt pulley. Using a electric motor, I then can spin it up to about 1750 rpms. If the gears are going to whine, you will diffenently hear them. I use it on all my rebuilds. The club members also, and guys from other clubs ask me to use it. It will make less work by installing and then pulling it back out or just living with a whiney trans.
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01-12-2011, 12:40 PM | #10 | |
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Re: pretesting a transmission
Quote:
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