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Is it possible to test tranny when off vehicle?

Motor Vehicle Maintenance & Repair Asked on June 20, 2021

I am preparing to do my first transmission (manual) rebuild job. I was just curious if it is possible to test whether the job has been done right while the tranny is off vehicle while simulation torque transfer and clutch hydraulics ? E.g. can you manually or some other way be cranking the transfer shaft while using a hand-held (or pedal driven) clutch simulation so that I know I did everything right before putting the tranny back on?

2 Answers

You can test the transmission by putting it through the gears while turning the input shaft and examining the output shaft for proper rotation. What I mean by this is, put the transmission in first gear and check the output shaft rotation speed as you turn the input shaft. Next, put it in second gear and again check the output transmission speed. Does the speed seem slower than when you have it in first? Check the rest of the gears, sequentially to ensure the transmission is shifting into the correct gears and the transmission is performing as expected. Put it in reverse to see if the output shaft counterspins.

You cannot test the clutch while off the car. It has to be mounted to the flywheel, and the flywheel needs to be mounted to the engine.

You can bench test the hydraulics to ensure they work. Other than that, you have rely on doing a good job and putting it back together correctly.

Correct answer by Pᴀᴜʟsᴛᴇʀ2 on June 20, 2021

you can test the clutches, just apply some air to the holes at the enf of the shaft, get something to seal it so the air doesn't leak. weberauto on youtube shows him applying shop air to test clutches, sounds like a clack sound, loud

Answered by Bruce Nguyen on June 20, 2021

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